CN210469375U - Transmitting circuit, chip and electronic equipment supporting ASK modulation - Google Patents
Transmitting circuit, chip and electronic equipment supporting ASK modulation Download PDFInfo
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- CN210469375U CN210469375U CN201921838329.XU CN201921838329U CN210469375U CN 210469375 U CN210469375 U CN 210469375U CN 201921838329 U CN201921838329 U CN 201921838329U CN 210469375 U CN210469375 U CN 210469375U
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Abstract
The utility model discloses a support transmitting circuit, chip and electronic equipment of ASK modulation, wherein the circuit includes: the power supply comprises a control module, a level conversion module, a power tube module, a first power supply input end and a second power supply input end; the first power supply input end supplies power to the control module; the second power supply input end supplies power to the power module; the level conversion module is used for level conversion between the control module and the power tube module, and the power tube module is used for generating driving signals according to output signals of a plurality of control output ends of the control module. The utility model discloses a set up two power input ends and level conversion module and provide different operating voltage for control module and power tube module, can reduce the consumption to reduce integrated circuit's area and cost. The utility model discloses can wide application in communication modulation circuit field.
Description
Technical Field
The utility model belongs to the technical field of the communication modulation circuit and specifically relates to a support transmitting circuit, chip and electronic equipment of ASK modulation.
Background
ISO/IEC 14443typeA, typeB, and ISO/IEC 15693 protocols specify radio frequency signal transmission with support for 100% and 10% ASK modulation. Meaning that the ASK modulation circuit on the market needs to satisfy the radio frequency signal transmission functions of the two modulations at the same time.
In the existing ASK modulated radio frequency transmitting circuit technology, a voltage domain is mostly adopted to supply power to all internal transmitting circuits, and the method not only increases the working power consumption of the circuit, but also increases the area of an integrated circuit and the cost of the integrated circuit.
SUMMERY OF THE UTILITY MODEL
In order to solve at least one of the above technical problems, the present invention is directed to: a transmitting circuit, a chip and an electronic apparatus supporting ASK modulation are provided to reduce power consumption of the transmitting circuit of ASK modulation therein and to reduce the area of an integrated circuit and the cost of the integrated circuit.
In a first aspect, an embodiment of the present invention provides:
a transmit circuit supporting ASK modulation, comprising:
a control module comprising at least one signal input and a plurality of control outputs; the control module is used for controlling output signals of a plurality of control output ends according to data input by the at least one signal input end;
the first power supply input end supplies power to the control module;
the second power supply input end supplies power to the power tube module;
the input end of the level conversion module is connected with the plurality of control output ends of the control module and is used for converting the level amplitude of the output signal of the control module;
the power tube module is connected with the output end of the level conversion module and used for generating driving signals according to output signals of a plurality of control output ends of the control module.
Further, the power tube module comprises a first power tube module and a second power tube module, and the first power tube module and the second power tube module are connected in series between a second power supply input end and a grounding end; and the joint of the first power tube module and the second power tube module is used as the output end of the power tube module.
Further, the first power tube module comprises a plurality of power tubes arranged in parallel, and the plurality of power tubes in the first power tube module are respectively controlled by different control output ends of the control module.
Further, at least two power tubes with different channel widths are arranged in the plurality of power tubes in the first power tube module.
Further, there are 16 power transistors in the first power transistor module, where the power transistors include four first power transistors, four second power transistors, four third power transistors, and four fourth power transistors, and a ratio of channel widths of the first power transistors, the second power transistors, the third power transistors, and the fourth power transistors is 8:4:2: 1.
Furthermore, the second power input end, the first power tube module, the second power tube module and the grounding end are sequentially connected, the power tubes in the first power tube module are all PMOS tubes, and the second power tube module is composed of at least one NMOS tube.
In a second aspect, an embodiment of the present invention provides:
a chip comprises an integrated circuit unit and a packaging unit, wherein the integrated circuit unit is provided with the transmitting circuit supporting ASK modulation, and the packaging unit leads out the input end and the output end of the integrated circuit unit.
Further, a plurality of strip-shaped heat dissipation holes are formed below the power tube on the transmitting circuit supporting ASK modulation in the integrated circuit unit along the current direction in the power tube.
In a third aspect, an embodiment of the present invention provides:
an electronic device comprises the chip, and the chip is used for ASK modulation in the electronic device.
The embodiment of the utility model provides a beneficial effect is: the embodiment of the utility model discloses an embodiment is through setting up two power input ends and level conversion module for control module can use the drive signal who controls power tube module output with the voltage domain that power tube module voltage size is different, consequently, the embodiment of the utility model discloses a can avoid control module to adopt higher operating voltage to work, thereby reduce transmitting circuit's consumption, integrated circuit's volume can be reduced effectively under the circumstances that the consumption reduces, and then reduces integrated circuit's cost.
Drawings
Fig. 1 is a block diagram of a transmitting circuit supporting ASK modulation according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a level shift unit in a transmitting circuit supporting ASK modulation according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating an application of a level shift unit in a transmitting circuit supporting ASK modulation according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a power transistor module and an external circuit according to an embodiment of the present invention;
FIG. 5 is a block diagram of a control module according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a power tube module according to an embodiment of the present invention;
fig. 7 is a pin diagram of a chip according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a heat dissipation structure under a power tube of a chip according to an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the specific embodiments.
Referring to fig. 1, the present embodiment discloses a transmission circuit supporting ASK modulation, which includes: the power supply comprises a control module, a first power supply input end, a second power supply input end, a level conversion module and a power tube module.
The control module comprises at least one signal input end and a plurality of control output ends; the control module is used for controlling output signals of a plurality of control output ends according to signals input by the at least one signal input end; in particular, the signal input terminal may be a serial input terminal or a plurality of parallel input terminals. And the number of the control output ends depends on the number of the power tubes in the power tube module and the series-parallel connection mode.
In this embodiment, the control module is composed of a decoder and a selector, where the decoder obtains an input signal from a signal input terminal, and then decodes the input signal to obtain information indicating a modulation mode and a power tube control parameter, and the decoder outputs the information to the selector, and the selector outputs a control signal for controlling the power tube module according to the information output by the decoder.
In this embodiment, the first power input terminal is used for accessing the working voltage of the control module, and the second power input terminal is used for accessing the working voltage of the power tube module. Generally, in the normal use process, the voltage connected to the first power input end is lower than the voltage connected to the second power input end. For example, the first supply input is supplied with a dc voltage of 3.3V, while the second supply input is supplied with a dc voltage of 5V. Of course, according to the control module and the power tube module configured by the transmitting circuit, the direct-current voltages connected to the first power input end and the second power input end may also be other values. For example, the first power input is connected to 1.8V, the second power input is connected to 9V, etc.
The input end of the level conversion module is connected with the plurality of control output ends of the control module and is used for converting the level amplitude of the output signal of the control module; the level shifting module is arranged to match the level amplitudes between the control module and the power transistor module to enable the control of the power transistor module using a higher operating voltage with a control module of a lower operating voltage. For example, the high level of the control signal output by the control module is 3.3V, which does not meet the requirement of 5V for the high level of the power tube, and here, a level shifting module may be provided to shift between the high level of 3.3V and the high level of 5V.
The level conversion module comprises a plurality of level conversion units, and each level conversion unit is responsible for the level conversion function of one control output end.
Referring to fig. 2, one level shifting unit may be implemented with the following structure.
The level conversion unit comprises a MOS transistor N18_1, a MOS transistor P18_1, a MOS transistor N50_1, a MOS transistor N50_2, a MOS transistor P50_1 and a MOS transistor P50_ 2. The port IN is an input end of a level signal output by the control module, and the port OUT is an output end connected with the power tube module. After entering from the port IN, the level signal is level-converted and then output from the port OUT.
If the port IN is at a low level, the port IN is changed to a high level after passing through an inverter composed of a MOS transistor N18_1 and a MOS transistor P18_1, at this time, the MOS transistor N50_1 is turned on, the MOS transistor N50_2 is turned off, the gate voltage of the MOS transistor P50_2 is pulled down to a low level, and the MOS transistor P50_2 is turned on, so that the drain of the MOS transistor P50_2 outputs a high level, that is, the port OUT outputs a high level, which is equivalent to inverting the signal.
The TVDD terminal is a voltage connected to the first power input terminal, the TVSS terminal may be a ground terminal, and the V0 terminal is a voltage connected to the second power input terminal.
As shown in fig. 3, when the level shift unit in fig. 2 is used, the circuit logic may be further completed with gate circuits such as a transmission gate and an inversion gate to keep the levels of the input signal and the output signal the same.
The power tube module is connected with the output end of the level conversion module and used for generating driving signals according to output signals of a plurality of control output ends of the control module.
MOS transistor MP in FIG. 4readerAnd MOS transistor MNreaderThe power tube module in this embodiment is formed, and the power tube module outputs a signal from the output terminal tx. The other components form an external antenna circuit.
MOS tube MPReaderAnd MOS transistor MNReaderRespectively belonging to a P-type power tube and an N-type power tubeRate tube, parallel CMOS power tube for read-write device terminal transmitting circuit, MOS tube MPReaderAnd MOS transistor MNReaderEach of which can be composed of one or more MOS transistors of the same type. The number of parallel CMOS transistors is mainly determined by the signal modulation depth of the transmitting circuit. The signal with the frequency of 13.56MHz is connected to the MOS tube MPReaderMOS tube MNReaderThe output signal of the output tx can be processed by the following circuit to generate a carrier wave, and the frequency of the carrier wave is also 13.56 MHz. Since the signal still contains various harmonics, L is requiredemcAnd CemcThe formed filter further removes harmonic waves; series matching network capacitor CsreaderAnd a parallel matching network capacitor CpreaderTogether forming an impedance matching network. The radio frequency interface circuit is mainly used for matching an antenna and impedance, generating resonance, transmitting energy to a tag antenna through mutual inductance coupling, and meanwhile, adjusting the quality factor of the antenna and the bandwidth of a transmission signal.
This embodiment is through setting up two power input ends and level conversion module for control module can use the drive signal who controls power tube module output with the different voltage domain of power tube module voltage size, consequently, the embodiment of the utility model discloses a can avoid control module to adopt higher operating voltage to work, thereby reduces transmitting circuit's consumption, and integrated circuit's volume can be reduced effectively under the circumstances that the consumption reduces, and then reduces integrated circuit's cost.
In addition to the power consumption problem caused by sharing one voltage domain, the existing ASK-modulated radio frequency transmitting circuit technology cannot achieve very fine and precise control on the transmitting power and the modulation index, so that a lot of incompatible problems can occur when a protocol is satisfied and tags of various antennas with different frequencies and different frequencies on the market are compatible, the reading and writing distance is not long, and the ASK-modulated radio frequency transmitting circuit technology is difficult to flexibly apply to various application scenes.
In a preferred embodiment, the power tube module comprises a first power tube module and a second power tube module, and the first power tube module and the second power tube module are connected in series between a second power supply input end and a grounding end; and the joint of the first power tube module and the second power tube module is used as the output end of the power tube module. The first power tube module comprises a plurality of power tubes which are arranged in parallel, and the plurality of power tubes in the first power tube module are respectively controlled by different control output ends of the control module.
The embodiment sets the first power tube module to comprise a plurality of power tubes connected in parallel, and each power tube is controlled by the different control ends of the control module, so that the control module can control the number of the conducted power tubes, and the resistance of the first power tube module in the whole power tube module is controlled, and the modulation depth can be controlled. As long as the quantity and the conduction resistance of the power tubes are reasonably set, fine adjustment of 10% and 100% ASK modulation on power can be simultaneously realized through one power tube module.
Referring to fig. 5 and 6, this embodiment discloses a preferred embodiment, in this embodiment, the control module is composed of a decoder and a selector, and of course, this embodiment is consistent with the previous embodiment and also includes a level conversion module, which is not shown in fig. 5 and 6. The power tube module in this embodiment is composed of an MOS tube MPReaderAnd MOS transistor MNReaderIs composed of MOS transistor MPReaderComprises 16 power tube modules connected in parallel. In this embodiment AVDD50 represents the voltage at the second power input.
In this embodiment, the MOS transistor MPReaderDesigned into a plurality of small modules, as shown in fig. 6, there are 4 small modules in total, where four MOS transistors in each row form a small module, each small module is composed of 4 PMOS transistors with different channel widths W, where the width ratio of the four MOS transistors in each group is: w1: w2: w3: w4 ═ 1:2:4: 8. The grid electrode of each PMOS tube is independently controlled by the control module. Of course, the channel lengths of these PMOS transistors are the same.
MOS tube MPReaderW of (2)General assemblyWhen W1, the emission power formed by the turned-on PMOS transistor is assumed to be Psend1gp, an abbreviation for gp, group power;then WGeneral assemblyWhen W2, Psend＝2gp；WGeneral assemblyWhen W4, Psend＝4gp；WGeneral assemblyWhen W8, Psend8 gp; all of the entire small modules are open, Psend15 gp; a total of 4 small modules, all open, Psend60 gp; referring to FIGS. 5 and 6, the present embodiment employs cwcon production [5:0]]Fine control management of each MOS of these small modules, cwcon _ ductiance 3:0]Respectively controlling 4 MOS tubes in each small module; cwcon production [4 ]]And cwcon production [5 ]]Controlling switches of entire small modules, cwcon production [4 ]]、cwconductance[5]When the values are all 0, only one small module is opened; cwcon production [4 ]]Is 1, cwcon production [5 ]]When the number is 0, 2 small modules are opened; cwcon production [4 ]]Is 0, cwcon product [5 ]]When the number is 1, opening 3 small modules; cwcon production [4 ]]Is 0, cwcon product [5 ]]When the number is 1, 4 small modules are opened; similarly modcon product [5:0]So too; each small module is simultaneously controlled by cwcon function [5:0]And modcon product [5:0]Control, who dominates the control, is determined by modu _ input. Wherein modcon product [5:0]The only 10% ASK modulation is useful, and is mainly used for controlling the power transistor when the modu _ input is 0 in the 10% ASK modulation.
When the transmit circuit is configured as a 100% ASK modulated signal, P is P when modu _ input is 1sendFrom cwcon production [5:0]]It is determined that all transmit power transistors are turned off when modu _ input is 0.
When the transmit circuit is configured to modulate a 10% ASK signal, the modulation depth of the transmission is set by cwcon transmission [5:0]]And modcon production [5:0]]Respectively control generation of PsendAnd (6) determining. When modu _ input is 1, PsendFrom cwcon production [5:0]]Determine, assume P at this timesend＝Psend_CW(ii) a When modu _ input is 0, PsendFrom modcon production [5:0]]Determine, assume P at this timesend＝Psend_mod(ii) a Depth and P of load modulationsend_mod/Psend_CWAre directly related.
The specific power meter is shown in table 1:
TABLE 1
In a preferred embodiment, at least two power transistors of the plurality of power transistors in the first power transistor module have different channel widths. The current that the power tube can pass is proportional to the channel width. Therefore, different transmitting powers can be combined through the power tubes with different channel widths, and fine control of the power is achieved.
As a preferred embodiment, there are 16 power transistors in the first power transistor module, where the power transistors include four first power transistors, four second power transistors, four third power transistors, and four fourth power transistors, and a ratio of channel widths of the first power transistors, the second power transistors, the third power transistors, and the fourth power transistors is 8:4:2: 1. In the embodiment, tens of levels of power control can be realized through 16 power tubes, and ASK modulation requirements of different occasions can be met.
As a preferred embodiment, the second power input terminal, the first power transistor module, the second power transistor module and the ground terminal are sequentially connected, the power transistors in the first power transistor module are all PMOS transistors, and the second power transistor module is composed of at least one NMOS transistor.
Referring to fig. 7, the present embodiment discloses a chip, which includes the transmitting circuit supporting ASK modulation in the above embodiment.
In this embodiment, the chip includes the following input interfaces: AVDD50, TVDD, TVSS, CLKI, modu _ input, cwcontrol [5:0], modcontrol [5:0] and txcontrol [4:0], wherein [5:0] refers to an input end with a number of 0-5 and a bit of 5, and two output ports: TX1 and TX 2.
In this embodiment, txcontrol [4:0] is an enable signal, which is a TX1 enable signal, a TX2 enable signal, whether TX2 modulates the enable signal, a TX2 negate enable signal, 100% ASK modulation, or 10% ASK modulation selection signal, respectively.
Of course, txcontrol [4:0] is input to the control module in this embodiment, and the control module implements the enable control according to the output logic. The control logic of this embodiment is shown in Table 2
TABLE 2
Referring to fig. 8, since the emitting power of the emitting end is large, the current flowing through the power tube is also large, in the layout design of the power tube, attention needs to be paid to increase the width of the source and drain ends, and multiple layers of metal are required to be wired in parallel, and a connection between the metal and the metal is perforated more, so as to enhance the over-current capability of the tube. Meanwhile, because of high power, the heat dissipation problem of the tube needs to be considered, and a plurality of long heat dissipation holes 802 need to be designed along the current flowing direction 801 in the metal area.
The embodiment discloses an electronic device, which may be a transmitting device satisfying ISO/IEC 14443typeA, typeB, ISO/IEC 15693 and other protocols, and includes the chip described in the previous embodiment, and the chip is used for ASK modulation in the electronic device.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (9)
1. A transmit circuit supporting ASK modulation, characterized by: the method comprises the following steps:
a control module comprising at least one signal input and a plurality of control outputs;
the first power supply input end supplies power to the control module;
the second power supply input end supplies power to the power tube module;
the input end of the level conversion module is connected with the plurality of control output ends of the control module and is used for converting the level amplitude of the output signal of the control module;
and the power tube module is connected with the output end of the level conversion module to generate a driving signal.
2. The transmit circuit supporting ASK modulation of claim 1, wherein: the power tube module comprises a first power tube module and a second power tube module, and the first power tube module and the second power tube module are connected between a second power supply input end and a grounding end in series; and the joint of the first power tube module and the second power tube module is used as the output end of the power tube module.
3. The transmission circuit supporting ASK modulation of claim 2, wherein: the first power tube module comprises a plurality of power tubes which are arranged in parallel, and the plurality of power tubes in the first power tube module are respectively controlled by different control output ends of the control module.
4. A transmit circuit supporting ASK modulation according to claim 3, wherein: at least two power tubes with different channel widths are arranged in the plurality of power tubes in the first power tube module.
5. The transmit circuit supporting ASK modulation of claim 4, wherein: the first power tube module comprises 16 power tubes, wherein the first power tube module comprises four first power tubes, four second power tubes, four third power tubes and four fourth power tubes, and the channel width ratio of the first power tubes, the second power tubes, the third power tubes and the fourth power tubes is 8:4:2: 1.
6. The transmission circuit supporting ASK modulation according to any one of claims 1-5, wherein: the second power input end, the first power tube module, the second power tube module and the grounding end are sequentially connected, the power tubes in the first power tube module are PMOS tubes, and the second power tube module is composed of at least one NMOS tube.
7. A chip, characterized by: the ASK modulation supporting transmitter circuit comprises an integrated circuit unit and a packaging unit, wherein the integrated circuit unit is provided with the ASK modulation supporting transmitter circuit according to any one of claims 1-6, and the packaging unit leads out an input end and an output end of the integrated circuit unit.
8. A chip according to claim 7, wherein: and a plurality of strip-shaped heat dissipation holes are formed below the power tube on the transmitting circuit supporting ASK modulation in the integrated circuit unit along the current direction in the power tube.
9. An electronic device, characterized in that: comprising a chip as claimed in claim 7 or 8 for use in ASK modulation in an electronic device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110730148A (en) * | 2019-10-29 | 2020-01-24 | 广州智慧城市发展研究院 | Transmitting circuit supporting ASK modulation, control method thereof, chip and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110730148A (en) * | 2019-10-29 | 2020-01-24 | 广州智慧城市发展研究院 | Transmitting circuit supporting ASK modulation, control method thereof, chip and electronic equipment |
| CN110730148B (en) * | 2019-10-29 | 2024-11-01 | 广州智慧城市发展研究院 | Transmitting circuit supporting ASK modulation, control method thereof, chip and electronic equipment |
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