JP2001007714A - Temperature correcting circuit and electronic equipment having temperature correcting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate temperature correction without generating any performance deterioration of electronic equipment by preventing influence of operation clock to be used for temperature correction processing from having adverse influence on the operation of the electronic equipment. SOLUTION: A temperature correcting circuit 28 is provided with an intermittent oscillator 283a for supplying an operating timing clock to each part in the temperature correcting circuit 28 and an outer trigger judging part 283e. Then, control signals VCOSW1 and 2, synchronizing with a transmission and reception slot are detected as trigger signals TRG1, TRG2, and TRG3 by the outer trigger deciding part 283e, and each temperature correction operation of reference oscillation frequencies, a transmission output level, and the operating point of a transmission power amplifier 225 is operated in a period, other than the transmission and reception slot based on the detecting timing of the trigger signals TRG1, TRG2, and TRG3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an electronic device such as an HS terminal, and more particularly to a temperature correction circuit for temperature-correcting the operation of an electronic circuit having a temperature characteristic such as an oscillation circuit and a transmission power amplifier circuit, and an electronic device having a temperature correction function.

[0002]

2. Description of the Related Art Generally, an oscillation circuit such as a frequency synthesizer is used in an electronic device such as a base station or a terminal device for mobile communication. This type of oscillation circuit usually uses a reference oscillator using a crystal oscillator, but the crystal oscillator generally has a temperature characteristic. This temperature characteristic has, for example, a cubic curve, and in order to obtain a stable oscillation frequency, temperature compensation in consideration of the temperature characteristic is indispensable.

[0003] A transmission power amplifier circuit also generally has a temperature characteristic. Among these temperature characteristics, for example, there is a type in which the transmission output level decreases linearly as the temperature rises, and compensation of this temperature characteristic is indispensable to obtain a stable transmission output.

Therefore, conventionally, for example, a circuit that corrects the oscillation frequency by changing the bias voltage of the oscillation circuit by combining a temperature sensor such as a thermistor and a variable capacitance element, or according to the temperature detected by the temperature sensor. A circuit for correcting the transmission output level by changing the gain of the variable gain amplifier is used.

[0005] These temperature correction circuits include, for example, a correction memory storing temperature correction data at fixed temperature intervals over an assumed ambient temperature range, and A / D conversion of a detected temperature value obtained by a temperature sensor. The data is converted into a digital value by a device, and the converted value is supplied to the correction memory as an address, whereby temperature correction data corresponding to the detected temperature value is read. Then, the temperature correction data is converted into an analog control signal by a D / A converter and supplied to an electronic circuit to be corrected.
Thus, the oscillation frequency or the transmission output level is corrected by varying the capacitance of the variable capacitance element and the gain of the variable gain amplifier.

[0006]

However, in such a conventional temperature correction circuit, the system clock and other operation clocks used by the temperature correction CPU during the temperature correction operation are transmitted via the D / A converter. When mixed with the output of the transmission power amplifier, the spurious due to the frequency component and the harmonic component of the clock is radiated not only in the transmission band (in-band) but also outside the transmission band (out-band). Generally, in the output characteristics of the transmitter, allowable values for the emission of unnecessary wave components are determined for each in-band and out-band. If the emission level of the above spurious signal exceeds these allowable values, problems such as communication interference may occur. Very unfavorable.

On the other hand, when the clock is mixed into the output of the reference oscillation circuit via the D / A converter, the transmission local oscillation frequency and the reception local oscillation frequency generated from the synthesizer change, and the radio transmission frequency in the transmission system is changed. , And deterioration of C / N and S / N, and deterioration of reception sensitivity in a receiving system.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the influence of an operation clock used for a temperature correction process from adversely affecting the operation of an electronic device. It is an object of the present invention to provide a temperature correction circuit capable of performing temperature correction without deteriorating the performance of the electronic device and an electronic device having a temperature correction function.

[0009]

In order to achieve the above object, a temperature correction circuit according to the present invention has storage means for storing temperature correction data set according to the temperature characteristics of an electronic circuit. The temperature of the surrounding area is detected by a temperature sensor, and the detected temperature value is converted into a digital value. The converted temperature value is supplied to the storage means to read out temperature correction data corresponding to the detected temperature value, and the temperature correction data is converted into an analog control signal. A temperature correction circuit body that corrects the temperature of the operation of the electronic circuit by supplying the electronic circuit to the electronic circuit, an operation period determination unit that determines a non-operation period of the electronic circuit, and a correction timing control unit. I have. Then, by the correction timing control means, the temperature correction circuit body is operated during the non-operation period of the electronic circuit determined by the operation time period determination means to perform the temperature correction operation,
In other periods, the operation of the temperature correction circuit main body is stopped.

Therefore, according to the present invention, the temperature correction operation for the electronic circuit is performed only during the non-operation period of the electronic circuit. Therefore, it is possible to reliably prevent a clock generated during the temperature correction processing from adversely affecting the operation of the electronic circuit to be corrected or other circuits in the electronic device.

Further, a temperature correction circuit according to the present invention comprises:
Temperature change determining means for determining whether the detected temperature value of the temperature sensor has changed by a predetermined value or more with respect to the detected temperature value at the time of performing the previous temperature correction operation is further provided. If it is detected that the temperature value has changed by a predetermined value or more, the temperature correction circuit body is operated during the non-operation period of the electronic circuit determined by the operation period determination means to perform a temperature correction operation, and In the period, the operation of the temperature correction circuit main body is stopped.

By doing so, the temperature correction operation
This is performed when the ambient temperature has changed by a predetermined temperature or more and after the non-operating period of the electronic circuit. In other words, the temperature correction operation is performed when it is really necessary and during a period in which the operation of the electronic circuit is not adversely affected. For this reason, it is possible to prevent deterioration of the transmission and reception characteristics due to the temperature correction processing clock, and also to reduce the number of times the temperature correction operation is performed, thereby further reducing unnecessary power consumption.

On the other hand, when the electronic device provided with the temperature correction circuit according to the present invention is a communication device for transmitting and receiving information signals by the time division multiplexing method, the determination means judges that the electronic device other than the slot allocated to the own device is not used. The time period is determined, and the correction timing control means operates the temperature correction means during a period other than the slot allocated to the own device to perform the temperature correction operation in accordance with the determination result of the determination means, and performs the temperature correction operation during other periods. The operation of the means is configured to be stopped.

In such an electronic device, for example, when the electronic circuit to be corrected is an oscillation circuit or a transmission circuit, the temperature correction operation is performed only during a period during which the transmission / reception operation or the transmission operation is not performed. For this reason, there is no fear that a clock generated during the temperature correction process enters the transmission path and emits spurs, or that the reference oscillation frequency changes due to the mixing of the clock to cause signal deterioration in the modulation operation or the frequency conversion operation. Disappears.

Further, when the electronic apparatus according to the present invention includes a plurality of electronic circuits having different temperature characteristics, a plurality of temperature correction functions are provided in the temperature correction means corresponding to each of the plurality of electronic circuits to determine an operation period. The means determines the non-operation period of each of the plurality of electronic circuits, and the correction timing control means performs the temperature correction during the non-operation period for each of the electronic circuits in accordance with the determination result of the operation period determination means. It is also characterized in that the temperature correction operation is performed by selectively operating the corresponding temperature correction function of the means, and the operation of the temperature correction function is stopped in other periods.

With this configuration, even when there are a plurality of electronic circuits to be corrected, the temperature correction operation can be selected and executed based on the determination result of the non-operation period.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit block diagram of a TDMA wireless communication device, showing an embodiment of an electronic device provided with a temperature correction circuit according to the present invention.

This TDMA radio communication apparatus has a baseband section 1, a radio section 2 having an antenna 3, an input / display section 4 having a keypad and a liquid crystal display, and a voice input and output section having a microphone and a speaker. It comprises an output unit 5 and a memory 6 for storing various control data necessary for the operation of the wireless communication device, user data such as received mail data and telephone directory data.

The baseband unit 1 includes a transmission / reception data encoding / decoding circuit, and a demultiplexing process for inserting transmission data into a transmission slot allocated to itself and extracting received data from the reception slot. And a main control unit that controls the overall operation of the wireless communication device as a whole.

The radio unit 2 modulates and demodulates transmission / reception data and transmits / receives the data wirelessly. For example, the radio unit 2 is configured as follows. FIG. 2 is a circuit block diagram showing the configuration. That is,
The baseband transmission signals I and Q output from the baseband unit 1 are first input to the quadrature modulation circuit 21, where they are mixed with the second local oscillation signal generated from the second local oscillator 25 and quadrature modulated. . Then, the quadrature modulated signal is input to the transmission circuit 22.

The transmission circuit 22 first controls the gain of the quadrature modulated signal by a gain control amplifier (GCA) 221, and then generates a second local oscillation signal for frequency conversion generated by the first local oscillator 26 in the up-converter 222. And frequency conversion into a radio frequency signal. Then, the transmission radio frequency signal passes through a band-pass filter 223, is input to a transmission power amplifier 225 via a preamplifier 224, is power-amplified here, and is supplied to an antenna circuit 23.

The antenna circuit 23 includes a high-frequency switch 231
And transmits the transmission radio frequency signal supplied from the transmission circuit 22 in the transmission slot period allocated to the own device, and transmits the transmission radio frequency signal to the band-pass filter 232.
To the antenna 3 to transmit the signal to the wireless line.
The switching operation of the high-frequency switch 231 is controlled by a slot timing designation signal ANTSW generated from the main control unit of the baseband unit 1.

On the other hand, the reception radio frequency signal arriving via the radio line is received by the antenna 3 and then input to the antenna circuit 23, where it is passed through the band-pass filter 232, and then transmitted to the own device by the high frequency switch 231. The assigned receiving slot is extracted and input to the receiving circuit 24.

The receiving circuit 24 amplifies the received radio frequency signal by the low noise amplifier 241 and then outputs the first down-converter 242 to the first local oscillator 26 generated by the first local oscillator 26.
The frequency is converted into a first received intermediate frequency signal by mixing with the local oscillation signal. Then, after passing the first received intermediate frequency signal through the bypass pass filter 243, the second down converter 244 generates the second received signal from the second local oscillator.
The frequency is converted into a second reception intermediate frequency signal by mixing with the local oscillation signal, and the second reception intermediate frequency signal is amplified by the intermediate frequency amplifier 245 and then output to the baseband unit 1. The receiving circuit 24 has a receiving field strength detector (RS
SI) 246 is provided, which detects the received electric field strength of the received radio wave based on the signal level of the second received intermediate frequency signal and notifies the main control unit of the baseband unit 1 of the detected signal. . This RSSI detection signal is used for determining the reception quality.

Each of the first local oscillator 26 and the second local oscillator 25 has PLL circuits 261 and 251.
The output is supplied to voltage controlled oscillators (VCOs) 263 and 253 via loop filters 262 and 252 to generate a local oscillation signal. Only the second local oscillator 25 has a phase shifter (PS) 254, and outputs two second local oscillation signals for quadrature modulation having a phase difference of π / 2 from each other by the phase shifter 254. Note that the first and second
Of the local oscillation signal of the frequency control data PDAT
A, and the frequency control data PDATA
Is provided from the main control unit of the baseband unit 1.

The reference oscillator 27 includes a quartz oscillator 271 and
An oscillation circuit (X.OSC) 272 for generating a reference oscillation signal based on the oscillation frequency of the quartz oscillator 271;
The reference oscillation signal generated from the oscillation circuit 272 is transmitted to the PLL circuit 26 of the first and second local oscillators 26 and 25.
1 and 251 respectively. The reference oscillator 27
Has a variable capacitance element 273. This variable capacitance element 273 is used to adjust the frequency of the reference oscillation signal.

A power switch is provided in each circuit of the radio unit 2 described above. These power switches activate the corresponding circuits only when needed,
Battery saving control signals TXBS, RXBS, CASW, generated from the main control unit of the baseband unit 1.
PASW, VCOSW1, VCOSW2, PLLBS
On / off control is performed by PLLBS2 and XOBS.

The wireless section 2 has a temperature correction circuit 28
Is provided. The temperature correction circuit 28 includes a temperature sensor 281 using a thermistor or the like,
An analog / digital converter (A / D) 282 for converting the detection signal into a digital value, and a temperature correction control circuit 28
3 and a temperature correction memory 284 storing temperature correction data
And three digital / analog converters (D / A) 28
5,286,287.

Of these, the temperature correction memory 284 stores three types of temperature correction targets: the reference oscillation frequency of the reference oscillator 27, the transmission output level of the transmission power amplifier 225, and the temperature corresponding to the operating point of the transmission power amplifier 225, respectively. The correction data is stored in association with the temperature.

The D / A converters 285, 286, and 287 are respectively subjected to the three types of temperature correction, that is, the reference oscillation frequency, the transmission output level, and the transmission power amplifier 225.
Are provided in correspondence with the operating points of. Then, the temperature correction data read from the temperature correction memory 284 is converted into an analog value, and the obtained analog control signals FCONT, PCONT, and PACONT are respectively converted into the variable capacitance element 273 of the reference oscillator 27 and the gain control amplifier 22.
1 and the transmission power amplifier 225.

The temperature correction control circuit 283 comprehensively controls the operation related to temperature correction, and is configured as follows, for example. FIG. 3 is a circuit block diagram showing the configuration. That is, the temperature correction control circuit 283 includes an intermittent oscillator 283a, an address control section 283b, a read circuit section 283c, an output control section 283d, an external trigger determination section 283e, and a mode setting / write / read section 283f. Is provided.

Among them, the intermittent oscillator 283a includes the respective circuits in the temperature correction circuit 28, that is, the A / D converter 282, the temperature correction memory 284, and the three D / A converters 285 and 285.
286, 287, the address control unit 283b, the readout circuit unit 283c, and the output control unit 2 in the temperature correction control circuit 283.
83d, an external trigger determining unit 283e, and an output end determining unit 283g are supplied with timing clocks necessary for the operation.

The external trigger discriminating unit 283e detects a specific timing control signal generated by the main control unit of the baseband unit 1 as trigger signals TRG1, TRG2, and TRG3 for specifying the execution timing of the temperature correction operation. For example, VCOSW1 that specifies the operation timing of the local oscillators 25 and 26 is a trigger signal TRG1 that specifies the temperature correction timing of the reference oscillation frequency, and VCOSW1 and VCOSW1 are the trigger signals that specify the temperature correction timing of the operation point of the transmission power amplifier 225. TRG2, and PLE is detected as a trigger signal TRG3 for defining the temperature correction timing of the transmission output level. When these trigger signals TRG1, TRG2, and TRG3 are detected,
A start signal ON is given to the intermittent oscillator 283a to start the oscillation operation of the timing clock.

The external trigger discriminating section 283e outputs a control signal for temperature correction to any of the D / A converters 285, 28.
6,287.
That is, the detected trigger signals TRG1, TRG2, T
In accordance with RG3, information indicating the temperature correction target, that is, information indicating whether the correction target is the reference oscillation frequency, the transmission output level, or the operating point of the transmission power amplifier 225, is generated. To the address control unit 283b,
It is provided to the readout circuit unit 283c, the output control unit 283d, and the D / A converters 285, 286, and 287, respectively.

The output end judging section 283g includes the output control section 2
83d, based on the output end indication signal ES generated
Control signals FCONT, PCONT, PA output from D / A converters 285, 286, 287 to each temperature correction target
The output completion timing of CONT is determined. Then, when the output completion timing is detected, a stop signal OFF is given to the intermittent oscillator 283a to stop the oscillation operation of the timing clock.

The address control section 283b reads out the temperature correction data based on the temperature detection data output from the A / D converter 282 and the information indicating the temperature correction target given from the external trigger determination section 283e. An address is generated and given to the temperature correction memory 284.

The readout circuit 283c selectively designates a storage area of the temperature correction memory 284 for each temperature correction data in accordance with the information representing the temperature correction target given from the external trigger determination section 283e. Then, temperature correction data is read from the address specified by the address control unit 283b in the specified storage area, and the temperature correction data is supplied to the output control unit 283d.

The output control section 283d selects one of the D / A converters 285, 286, 287 based on the information representing the temperature correction object given from the external trigger discriminating section 283e, and selects this. The temperature correction data read from the temperature correction memory 284 is supplied to the D / A converter. After the output of the temperature correction data is completed, an output end display signal ES is generated, and the output end display signal ES is supplied to the output end determination section 283g.

The mode setting / writing / reading unit 283f
Specifies whether to set the temperature correction memory 284 to the write mode or the read mode. When writing the temperature correction data to the temperature correction memory 284, the mode setting / write / read unit 283f writes the data. Set the print mode.

Next, the operation of the temperature correction circuit 28 configured as described above will be described. First, temperature correction data is written to the temperature correction memory 284 before using the wireless communication device. That is, first, the W / R terminal is set to W, and the power is turned on. When the power is turned on, a power-on reset is activated, and the main control unit of the baseband unit 1 and the temperature correction control circuit 283 of the temperature correction circuit 28 are reset. Next, STB is set to “H” level. Then, mode setting / write / read section 283f enters the write mode. In this state, when a write address is specified and temperature correction data is input, the temperature correction data is written to a specified address of the temperature correction memory 284.

The temperature correction data is prepared in advance for each of the three types of temperature correction targets, that is, the reference oscillation frequency, the transmission output level, and the operating point of the transmission power amplifier, based on the rating data or the measurement data. For example, when the temperature characteristic of the reference oscillator 27 using the crystal oscillator has a cubic curve as shown in FIG. 6, the temperature correction data of the reference oscillation frequency is set according to the temperature characteristic. When the operating point of the transmission power amplifier 225 has a temperature characteristic as shown in FIG. 7, the temperature correction data of this operating point includes the bias voltage of the transmission power amplifier 225 as the temperature rises. Set to increase. The write address specified for the temperature correction memory 284 is set according to the information amount of each of the temperature correction data.

When the writing of the temperature correction data is completed, the mode setting / writing / reading unit 283f is set to the reading mode. In this state, the reading address is sequentially given and the temperature correction data is read to read out the written data. Check the contents.

When the use of the wireless communication device in which the temperature correction data is written in the temperature correction memory 284 is started, the temperature correction circuit 28 performs a temperature correction operation as follows.

That is, during communication of the wireless communication device,
Various operation timing control signals are generated from the main control unit of the baseband unit 1 in synchronization with the timing of the transmission slot and the reception slot used by the own device. Each circuit unit operates. For example, as shown in FIG. 8, a predetermined time before the start timing of the reception slot, signals VCOSW1 and VCOSW2 for activating VCOs 263 and 253 of local oscillators 26 and 25 are generated from the main control unit, and these signals VCOSW1 and VCOSW2 are generated.
Upon receiving W1 and W2, each VCO 263, 253 is activated.

The temperature correction circuit 28 of the present embodiment uses the operation timing control signals VCOSW1 and VCOSW2 as trigger signals T
Recognized as RG1. That is, when the operation timing control signals VCOSW1 and VCOSW2 are generated from the main control unit, the external trigger determination unit 283e outputs the signal VCOSW1.
The rising edges of 1 and 2 are detected as a trigger signal TRG1. Then, according to the detected trigger signal TRG1, information indicating that the temperature correction target is the reference oscillation frequency is stored in the address control unit 283b, the readout circuit unit 283c, the output control unit 283d, and the D / A converters 285, 286. 2
87 each. In addition, intermittent oscillator 2
A start signal ON is given to 83a to start the oscillation operation of the timing clock.

As a result, the temperature correction circuit 28 performs a temperature correction operation for the reference oscillation frequency. That is, at this time, the temperature detection signal output from the temperature sensor 281 is converted into a digital signal by the A / D converter 282 and supplied to the address control unit 283b. Address control unit 2
83b generates a read address based on the digital temperature detection signal and information indicating that the temperature correction target given by the external trigger determination unit 283e is the reference oscillation frequency, and supplies the read address to the temperature correction memory 284. .

On the other hand, the readout circuit section 283c, based on the information indicating that the object of the temperature correction given from the external trigger determination section 283e is the reference oscillation frequency, in the storage area of the temperature correction memory 284, An area in which frequency temperature correction data is stored is selectively designated. Then, the address control unit 28 of the specified storage area
The temperature correction data is read from the address specified by 3b, and the temperature correction data is output to the output control unit 283d. The output control unit 283d specifies the reference oscillation frequency correction D / A converter 285 based on the information given from the external trigger determination unit 283e indicating that the temperature correction target is the reference oscillation frequency. D / A converter 2
85 is supplied with the temperature correction data output from the read control unit 283c.

Therefore, the temperature correction data of the reference oscillation frequency is converted into an analog signal by the D / A converter 285 and supplied to the reference oscillator 27 as a control voltage FCONT for temperature correcting the reference oscillation frequency.
FIG. 4 shows a circuit configuration of the reference oscillator 27. When the control voltage FCONT is supplied, the capacitance of the variable capacitance element 273 changes according to the control voltage value. The energizing voltage of the child 271 changes,
The oscillation frequency of the transistor oscillation circuit 274 changes.

Thus, the oscillation frequency of the reference oscillator 27 is corrected. The corrected reference oscillation frequency is
At the next correction timing, it is held until a new control voltage FCONT is output from the D / A converter 285.

When the output of the control signal FCONT from the D / A converter 285 to the reference oscillator 27 is completed,
The stop signal OFF is generated from the output end determination unit 283g, and the intermittent oscillator 283a stops the oscillation operation of the operation timing clock.

Therefore, if a control signal generated at a timing earlier than the time required for the temperature correction operation earlier than the start timing of the reception slot is selected as the trigger signal TRG1, the temperature correction operation of the reference oscillation frequency by the temperature correction circuit 28 will not be performed. As shown in FIG. 8, the process is surely completed before the reception slot period starts.

Therefore, the temperature correction operation of the reference oscillation frequency by the temperature correction circuit 28 is performed during a period other than the transmission / reception slot period of the wireless communication device. For this reason,
There is no fear that the operation timing clock generated by the temperature correction circuit 28 during the temperature correction operation will adversely affect the transmission / reception operation.

Next, the operation for correcting the temperature of the transmission output level will be described. As shown in FIG. 9, when a signal VCOSW1,2 for activating VCOs 263,253 of local oscillators 26,25 is output from the main control unit a predetermined time before the start timing of the transmission slot, the temperature correction circuit 28
Recognizes the operation timing control signals VCOSW1 and VCOSW2 as the trigger signal TRG2 by the external trigger determination unit 283e. In response to the detected trigger signal TRG2, information indicating that the temperature correction target is the transmission output level is transmitted to the address control unit 283b and the readout circuit unit 283.
c, output control section 283d and D / A converters 285, 28
6, 287, respectively, and the intermittent oscillator 283
A start signal ON is given to a to start the oscillation operation of the timing clock.

As a result, the temperature correction circuit 28 performs a temperature correction operation on the transmission output level. That is, similarly to the case of the trigger signal TRG1, the temperature sensor 28
The A / D converter 282 converts the temperature detection signal output from 1 into a digital signal and supplies the digital signal to the address control unit 283b. The address control unit 283b generates a read address based on the digital temperature detection signal and the information representing the temperature correction target given from the external trigger determination unit 283e, and supplies the read address to the temperature correction memory 284.

On the other hand, the readout circuit section 283c stores the temperature correction data of the transmission output level in the storage area of the temperature correction memory 284 based on the information representing the temperature correction target given from the external trigger determination section 283e. Select the selected area. Then, it reads out the temperature correction data from the address specified by the address control unit 283b in the specified storage area, and outputs the temperature correction data to the output control unit 283d. Output control unit 283
d designates a transmission output level correction D / A converter 286 based on information indicating that the temperature correction target given by the external trigger determination unit 283e is a transmission output level, and this D / A The read control unit 28 is supplied to the converter 286.
The temperature correction data output from 3c is supplied.

Therefore, the temperature correction data of the reference oscillation frequency is converted into an analog signal by the D / A converter 286 and supplied to the gain control amplifier 221 as a control voltage PCONT for temperature correcting the transmission output level. . As a result, the gain of the gain control amplifier 221 is variably controlled, whereby the signal level of the modulation signal is adjusted.

When the output of the control signal PCONT from the D / A converter 286 to the gain control amplifier 221 is completed, a stop signal OFF is generated from the output end determining unit 283g, and the intermittent oscillator 283a operates the operation timing clock. Stop the oscillation operation of

Thus, the temperature of the transmission output level is corrected during the non-operation period before the transmission slot is started.
Note that the corrected transmission output level is held until a new control voltage PCONT is output from the D / A converter 286 at the next correction timing.

As described above, the temperature correction operation of the transmission output level by the temperature correction circuit 28 is performed in a period other than the transmission / reception slot period of the wireless communication device, similarly to the temperature correction operation of the reference oscillation frequency. Become. Therefore, there is no fear that the operation timing clock generated by the temperature correction circuit 28 during the temperature correction operation adversely affects the transmission / reception operation.

Next, the operation of correcting the temperature of the operating point of the transmission power amplifier 225 will be described. As shown in FIG. 10, the main control unit of the baseband unit 1 sends the VCOs of the local oscillators 26 and 25 a predetermined time before the start timing of the transmission slot.
VCOSW1 and VCOSW2 for activating 263 and 253
Is output, the temperature correction circuit 28 outputs the operation timing control signal VCOSW by the external trigger determination unit 283e.
Recognize 1, 2 as the trigger signal TRG3. And
In response to the detected trigger signal TRG3, information indicating that the temperature correction target is the operating point of the transmission power amplifier 225 is stored in the address control unit 283b, the readout circuit unit 283c, the output control unit 283d, and the D / A converter 285. 286,2
87, and a start signal ON to the intermittent oscillator 283a to start the oscillation operation of the timing clock.

As a result, the temperature correction circuit 28 starts the temperature correction operation for the operating point of the transmission power amplifier 225. That is, as in the case of the trigger signal TRG2, the temperature detection signal output from the temperature sensor 281 is A
The signal is converted into a digital signal by the / D converter 282 and supplied to the address control unit 283b. Address control unit 283
b generates a read address based on the digital temperature detection signal and the information representing the temperature correction target given from the external trigger discriminating unit 283e.
84.

On the other hand, the readout circuit section 283c determines the operating point of the transmission power amplifier 225 in the storage area of the temperature correction memory 284 based on the information representing the temperature correction object given from the external trigger determination section 283e. An area in which the temperature correction data is stored is selectively designated. Then, it reads out the temperature correction data from the address specified by the address control unit 283b in the specified storage area, and outputs the temperature correction data to the output control unit 283d. The output control unit 283d designates a D / A converter 287 for operating point correction based on the information representing the temperature correction target given from the external trigger discriminating unit 283e.
87 is supplied with the temperature correction data output from the read control unit 283c.

Therefore, the temperature correction data of the reference oscillation frequency is converted into an analog signal in D / A converter 287 and supplied to transmission power amplifier 225 as control voltage PACONT for temperature correcting the transmission output level. . As a result, the operating point of the transmission power amplifier 225 is variably controlled, whereby the operation of the transmission power amplifier 225 is adjusted. FIG. 5 shows an example of the circuit configuration of the transmission power amplifier 225. The biases of the third and fourth stages of the FET amplifier circuit having a multi-stage configuration are applied to the D / A converter 2
The operating point is temperature-corrected by variably setting the control voltage PACONT output from the switch 87.

When the output of the control signal PACONT from the D / A converter 287 to the transmission power amplifier 225 is completed, a stop signal OFF is generated from the output end determining unit 283g, and the intermittent oscillator 283a operates the operation timing clock. Stop the oscillation operation of

Thus, the temperature of the transmission output level is corrected during the non-operation period before the transmission slot is started.
The corrected operating point is output from the D / A converter 287 at the next correction timing by the new control voltage PACO.
It is held until NT is output.

As described above, the temperature correction operation of the operating point of the transmission power amplifier 225 by the temperature correction circuit 28 is performed in the same manner as the temperature correction operation of the reference oscillation frequency and the temperature correction of the transmission output level. Is performed in a period other than the transmission / reception slot period. Therefore, there is no fear that the operation timing clock generated by the temperature correction circuit 28 during the temperature correction operation adversely affects the transmission / reception operation.

In the above description, the reference oscillation frequency,
Each of the temperature correction operations of the transmission output level and the operating point of the transmission power amplifier 225 is performed by the operation timing control signal VC.
Since OSW1 and OSW2 are performed as triggers TRG1, TRG2 and TRG3, they are expected to overlap in time. In order to prevent this, the timing of each temperature correction operation is different from each other. This is because the external trigger determination unit 28
This is realized by making the supply timing of the start signal ON from 3e to the intermittent oscillator 283a different according to the control target.

As described above, in this embodiment, in the temperature correction circuit 28, the oscillator that supplies the operation timing clock to each section in the temperature correction circuit 28 is the intermittent oscillator 2.
83a, and an external trigger determination unit 283e is provided. The external trigger discriminating unit 283e detects the control signals VCOSW1 and VCOSW2 synchronized with the transmission / reception slot as the trigger signals TRG1, TRG2 and TRG3, and performs the reference oscillation based on the detection timing of the trigger signals TRG1, TRG2 and TRG3. The temperature, the transmission output level, and the operating point of the transmission power amplifier 225 are each corrected in a period other than the transmission / reception slot.

Accordingly, the temperature correction operation of the reference oscillation frequency, the temperature correction operation of the transmission output level, and the temperature correction operation of the operating point of the transmission power amplifier 225 by the temperature correction circuit 28 are performed during periods other than the transmission / reception slot of the wireless communication device. This allows the temperature correction circuit 28 to operate during the temperature correction operation.
There is no fear that the operation timing clock generated in the above will adversely affect the transmission / reception operation.

For example, an operation timing clock generated at the time of temperature correction processing is mixed into a transmission path and spurious is radiated, or a reference oscillation frequency is changed due to the mixing of the operation timing clock to perform a modulation operation or a frequency conversion operation. There is no need to worry about signal degradation.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the temperature correction operation is performed every time the trigger signals TRG1, TRG2, and TRG3 are detected. However, prior to the execution of the temperature correction operation, the temperature detected by the temperature sensor 281 is used for the previous correction. It may be configured to determine whether the temperature has changed by a predetermined amount or more compared to the temperature detected at the timing, and execute the temperature correction operation only when the temperature has changed by the predetermined amount or more. In this way, it is possible to prevent the useless temperature correction operation from being performed.
8 can be reduced to extend the battery life.

In the above embodiment, the case where the reference oscillation frequency of the reference oscillator 27, the transmission output level of the transmission power amplifier 225, and the operating point of the transmission power amplifier 225 are selected as the temperature correction targets has been described. May be targeted for temperature correction, and if there are other circuits that require temperature correction, these circuits may be configured to perform the temperature correction operation.

Further, in the above embodiment, the control signals VCOSW1 and VCOSW2 synchronized with the transmission / reception slot are used as the trigger signal TR
The temperature correction operation is started by detecting the signals G1, TRG2, and TRG3. Alternatively, the temperature correction operation may be started by detecting various battery saving signals generated in synchronization with the transmission / reception slots as trigger signals. Good.
Further, the control signal to be used as the trigger signal may be different for each temperature correction target, and the temperature correction target may be identified from the type of the detected control signal.

Further, in the above embodiment, the temperature sensor 28
1. Temperature correction memory 284 and temperature correction control circuit 283
The above description has been made by taking as an example the case where all the circuits constituting the temperature correction circuit 28 are provided in the wireless unit 2. Among them, the temperature correction control circuit 283 and the temperature correction memory 284 are the main control unit and its internal memory. It may be configured so that it is also used for.

Further, in the above-described embodiment, the wireless communication device has been described as an example. However, the present invention can be applied to other electronic devices having an electronic circuit to be subjected to temperature correction, such as audio devices. In addition, the type of the electronic circuit to be subjected to the temperature correction, the configuration of the temperature correction circuit, and the like can be variously modified without departing from the scope of the present invention.

[0076]

As described above in detail, according to the present invention, an operation period determining means for determining a non-operating period of an electronic circuit to be corrected and a correction timing control means are newly provided. During the non-operation period of the electronic circuit determined by the operation period determination unit, the temperature correction unit is operated to perform the temperature correction operation, and during other periods, the operation of the temperature correction unit is stopped.

Therefore, according to the present invention, it is possible to prevent the influence of the operation clock used for the temperature correction processing from having an adverse effect on the operation of the electronic device, whereby the temperature correction can be performed without deteriorating the performance of the device. An electronic device having a temperature correction circuit and a temperature correction function that can be performed can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a wireless communication device provided with a temperature correction circuit according to the present invention.

FIG. 2 is a circuit block diagram showing a configuration of a wireless unit of the wireless communication device shown in FIG.

FIG. 3 is a circuit block diagram illustrating a configuration of a temperature correction circuit of the wireless unit illustrated in FIG. 2;

FIG. 4 is a circuit configuration diagram illustrating a configuration of a reference oscillator of the wireless unit illustrated in FIG. 2;

FIG. 5 is a circuit configuration diagram showing a configuration of a transmission power amplifier of the radio unit shown in FIG. 2;

FIG. 6 is a diagram showing an example of a temperature characteristic of a reference oscillator using a crystal resonator.

FIG. 7 is a diagram illustrating an example of a temperature characteristic of a transmission power amplifier.

FIG. 8 is a timing chart for explaining a temperature correction operation of a reference oscillation frequency by the temperature correction circuit shown in FIG. 3;

FIG. 9 is a timing chart for explaining a temperature correction operation of the operating point of the transmission power amplifier by the temperature correction circuit shown in FIG. 3;

FIG. 10 is a timing chart for explaining a temperature correction operation of a transmission output level by the temperature correction circuit shown in FIG. 3;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Baseband part 2 ... Radio part 3 ... Antenna 4 ... Input / display part 5 ... Audio input / output part 6 ... Memory 21 ... Quadrature modulator 22 ... Transmission circuit 23 ... Antenna circuit 24 ... Receiving circuit 25 ... 2nd local oscillator 26 first local oscillator 27 reference oscillator 28 temperature correction circuit 221 gain control amplifier 222 upconverter 223 bandpass filter 224 preamplifier 225 transmission power amplifier 231 high frequency switch 232 bandpass filter 233 Antenna terminal 241, low noise amplifier 242, first down converter 243, reception intermediate frequency filter 244, second down converter 245, reception intermediate frequency amplifier 246, reception electric field strength detector (RSSI) 251, 261, PLL circuits 252, 262 ... Loop filters 253,263 ... Voltage control Vibrator (VCO) 254 Phase shifter 271 Crystal oscillator 272 Reference oscillation circuit 273 Variable capacitance element 281 Temperature sensor 282 Analog / digital converter (A / D) 283 Temperature correction control circuit 283 a Intermittent oscillator 283b ... Address control unit 283c ... Reading circuit unit 283d ... Output control unit 283e ... External trigger discrimination unit 283f ... Mode setting / writing / reading unit 283g ... Output end discrimination unit 284 ... Temperature correction memory 285,286,287 ... Digital / analog conversion Container (D / A)

Continued on the front page F term (reference) 5J079 AA04 BA01 BA02 CB01 DA13 FA02 FA13 FA14 FA21 FB25 FB26 FB38 FB39 FB48 GA02 KA05 5J090 AA01 CA00 CA02 CN01 FA18 FA20 FN07 HA02 HA09 HA25 HA29 HA30 HA33 HA38 HA43 KA32 KA29 KA29 KA44 KA53 KA67 MA20 SA13 TA01 TA04 TA06 5J106 AA01 BB01 CC20 CC38 EE01 GG01 HH08 JJ01 KK13 LL01 5K060 BB07 CC05 DD04 EE04 HH23 HH25 HH26 HH28 HH31 JJ02 JJ04 JJ08 LL04

Claims (9)

[Claims] 1. A temperature correction circuit for correcting an operation of an electronic circuit having a temperature characteristic, comprising: storage means for storing temperature correction data set according to a temperature characteristic of the electronic circuit; The temperature is detected by a temperature sensor, and the detected temperature value is converted into a digital value. The converted temperature value is supplied to the storage means to read out temperature correction data corresponding to the detected temperature value. The temperature correction data is converted into an analog control signal. A temperature correction circuit main body for correcting the temperature of the operation of the electronic circuit by supplying the temperature to the electronic circuit; an operation period determination unit for determining a non-operation period of the electronic circuit; and the electronic device determined by the operation period determination unit. The temperature correction circuit body is operated during the non-operation period of the circuit to perform the temperature correction operation, and the operation of the temperature correction circuit body is performed during other periods. A temperature correction circuit comprising: a correction timing control unit for stopping the temperature correction. 2. The apparatus according to claim 1, further comprising a temperature change determining unit configured to determine whether a temperature detected by the temperature sensor has changed by a predetermined value or more from a temperature detected at the time of performing a previous temperature correction operation. The correction timing control means, when the temperature change determination means detects that the detected temperature value has changed by a predetermined value or more, performs the temperature correction during the non-operation period of the electronic circuit determined by the operation period determination means. The temperature correction circuit according to claim 1, wherein the temperature correction operation is performed by operating a circuit main body, and the operation of the temperature correction circuit main body is stopped during other periods. 3. An electronic apparatus having a function of correcting the temperature of an operation of an electronic circuit having a temperature characteristic, comprising: storage means for storing temperature correction data set according to the temperature characteristic of the electronic circuit; The peripheral temperature of the circuit is detected by a temperature sensor, and the detected temperature value is converted into a digital value. The digital value is supplied to the storage means to read out the temperature correction data corresponding to the detected temperature value. A temperature correction circuit that converts the temperature of the operation of the electronic circuit by converting and supplying the electronic circuit to the electronic circuit; an operation period determination unit that determines a non-operation period of the electronic circuit; The temperature correction circuit is operated during the non-operation period of the electronic circuit to perform the temperature correction operation, and the operation of the temperature correction circuit is stopped during other periods. An electronic device having a temperature correction function, comprising: a correction timing control unit for causing the electronic device to perform temperature correction. 4. A temperature change determining means for determining whether a detected temperature value of the temperature sensor has changed by a predetermined value or more from a detected temperature value at the time of performing a previous temperature correction operation, The correction timing control means, when the temperature change determination means detects that the detected temperature value has changed by a predetermined value or more, performs the temperature correction during the non-operation period of the electronic circuit determined by the operation period determination means. 4. The electronic device having a temperature correction function according to claim 3, wherein the temperature correction operation is performed by operating a circuit, and the operation of the temperature correction circuit is stopped during other periods. 5. When the electronic device is a communication device that transmits and receives an information signal by a time division multiple access method, the determining unit determines a period other than a slot allocated to the electronic device, and determines the correction timing. The control unit operates the temperature correction circuit during a period other than the slot allocated to the own device to perform the temperature correction operation according to the determination result of the determination unit,
4. The electronic device having a temperature correction function according to claim 3, wherein the operation of the temperature correction circuit is stopped during other periods. 6. When the electronic circuit is an oscillation circuit, the temperature correction circuit has storage means for storing temperature correction data corresponding to a temperature characteristic of the oscillation circuit, and a temperature around the oscillation circuit. Is detected by a temperature sensor, the detected temperature value is converted into a digital value, and the converted value is supplied to the storage means to read out temperature correction data corresponding to the detected temperature value. Has a function of correcting the oscillation frequency of the oscillation circuit by supplying to the oscillation circuit, the operation period determination means determines a period other than the transmission slot period and the reception slot period as the non-operation period of the oscillation circuit, The correction timing control unit controls the temperature correction unit during a period other than the transmission slot period and the reception slot period determined by the operation period determination unit. 6. The electronic circuit having a temperature correction function according to claim 5, wherein the electronic circuit is operated to perform the correction operation of the oscillation frequency, and the operation of the temperature correction unit is stopped in other periods. 7. When the electronic circuit is a transmission amplification circuit, the temperature correction means includes storage means for storing temperature correction data corresponding to a temperature characteristic of the transmission amplification circuit, and the transmission amplification circuit The temperature of the surrounding area is detected by a temperature sensor, the detected temperature value is converted into a digital value, and the converted value is applied to the storage means to read out temperature correction data corresponding to the detected temperature value, and the temperature correction data is converted into an analog control signal. Has a function of correcting the transmission output level of the transmission amplification circuit by supplying the transmission amplification circuit to the transmission amplification circuit, and the operation period determination unit sets a period other than the transmission slot period as the non-operation period of the transmission amplification circuit. Determining, the correction timing control unit operates the temperature correction unit during a period other than the transmission slot period determined by the operation period determination unit. 6. The electronic circuit having a temperature correction function according to claim 5, wherein the operation of correcting the transmission output level is performed by the control unit, and the operation of the temperature correction unit is stopped during other periods. 8. When the electronic circuit is a transmission amplification circuit, the temperature correction means includes storage means for storing temperature correction data corresponding to a temperature characteristic of the transmission amplification circuit, and the transmission amplification circuit The temperature of the surrounding area is detected by a temperature sensor, the detected temperature value is converted into a digital value, and the converted value is applied to the storage means to read out temperature correction data corresponding to the detected temperature value, and the temperature correction data is converted into an analog control signal. Having the function of correcting the operating point of the transmission amplifier circuit by supplying it to the transmission amplifier circuit, wherein the operation period determination unit determines a period other than a transmission slot period as a non-operation period of the transmission amplifier circuit. The correction timing control unit operates the temperature correction unit during a period other than the transmission slot period determined by the operation period determination unit to perform the transmission. 6. The electronic circuit having a temperature correction function according to claim 5, wherein the operation of correcting the operating point of the signal amplification circuit is performed, and the operation of the temperature correction unit is stopped in other periods. 9. When the electronic device includes a plurality of electronic circuits having different temperature characteristics, the temperature correction unit includes a plurality of temperature correction functions corresponding to each of the plurality of electronic circuits. The determining means determines a non-operating period of each of the plurality of electronic circuits, and the correction timing control means determines the non-operating period of each of the electronic circuits during the non-operating period for each electronic circuit according to a result of the determination by the operating period determining means. 4. The temperature correction function according to claim 3, wherein the temperature correction function is selectively operated to perform the temperature correction operation, and the operation of the temperature correction function is stopped during other periods. Electronic equipment with.