CN109687827A - A kind of zero intermediate frequency filtering amplifying device with direct current calibration - Google Patents
A kind of zero intermediate frequency filtering amplifying device with direct current calibration Download PDFInfo
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- CN109687827A CN109687827A CN201811533176.8A CN201811533176A CN109687827A CN 109687827 A CN109687827 A CN 109687827A CN 201811533176 A CN201811533176 A CN 201811533176A CN 109687827 A CN109687827 A CN 109687827A
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- 238000004519 manufacturing process Methods 0.000 claims description 3
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- 238000000034 method Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
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- 230000002452 interceptive effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3089—Control of digital or coded signals
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/10—Calibration or testing
- H03M1/1009—Calibration
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a kind of zero intermediate frequency filtering amplifying devices with direct current calibration, including digital control filter, carry out bandwidth filtering to input signal in response to filter bandwidht digital controlled signal；First Numerical Controlled Current Source forms the first current signal in response to the first direct current calibration digital controlled signal；Second Numerical Controlled Current Source forms the second current signal in response to the second direct current calibration digital controlled signal；Numerical control differential mode direct current calibration unit carries out the calibration of differential mode direct current to the output signal of the digital control filter according to first current signal and the second current signal；Numerical-control attenuator carries out gain control in response to output signal of the decaying digital controlled signal to the numerical control differential mode direct current calibration unit；Gain amplifier amplifies the output signal of the numerical-control attenuator；Common mode direct current switching amplifier carries out the conversion of common mode direct current to the output signal of the gain amplifier, and 0 to the 1V direct current that 0 to 40MHz intermediate-freuqncy signal can be achieved in the present invention, which is calibrated, to be adjusted.
Description
Technical field
The present invention relates to zero intermediate frequency filtering amplification sectors.More particularly, to a kind of zero intermediate frequency filter with direct current calibration
Wave amplifying device.
Background technique
In zero intermediate frequency communication system, it will usually it is straight to generate interference due to the local oscillator leakage of image signal or frequency mixer
Signal is flowed, since these interference direct current signals are identical as the frequency of desired signal, is difficult to filter by traditional filter
Fall.The method generallyd use be transmitting terminal using predistortion or signal process part using certain algorithm by
These direct current signals filter.But the problem of predistortion is the transmission path due to not knowing signal, is difficult accurately to carry out pre-
Distortion is offset to the interference just generated with system.And the master of direct current signal is eliminated by Digital Signal Processing means
Problem is wanted to be that the static direct current point of system may change, to make mould in the case where interfering direct current signal excessive
Number converter can not accurately sample, that is, reduce the sampling precision of analog-digital converter.
Summary of the invention
The purpose of the present invention is to provide a kind of zero intermediate frequency filtering amplifying devices with direct current calibration, by using numerical control
The calibration of differential mode direct current, the problem for causing misregistration signal excessive during avoiding filtering interference signal.
In order to achieve the above objectives, the present invention adopts the following technical solutions:
The invention discloses a kind of zero intermediate frequency filtering amplifying devices with direct current calibration, including digital control filter, numerical control
Differential mode direct current calibration unit, the first Numerical Controlled Current Source, the second Numerical Controlled Current Source, numerical-control attenuator, gain amplifier and common mode are straight
Flow switching amplifier；
Wherein, the digital control filter carries out bandwidth filter to input signal in response to filter bandwidht digital controlled signal
Wave；First Numerical Controlled Current Source forms the first current signal in response to the first direct current calibration digital controlled signal；Described second
Numerical Controlled Current Source forms the second current signal in response to the second direct current calibration digital controlled signal；The numerical control differential mode direct current calibration
Unit is used to carry out differential mode to the output signal of the digital control filter according to first current signal and the second current signal
Direct current calibration；Output of the numerical-control attenuator in response to decaying digital controlled signal to the numerical control differential mode direct current calibration unit
Signal carries out gain control；The gain amplifier is for amplifying the output signal of the numerical-control attenuator；It is described total
Mould direct current switching amplifier is used to carry out the conversion of common mode direct current to the output signal of the gain amplifier.
Preferably, the numerical control differential mode direct current calibration unit include operational amplifier, first resistor device, second resistor,
3rd resistor device and the 4th resistor；
The non-inverting input terminal of the operational amplifier is connect with first Numerical Controlled Current Source；
The inverting input terminal of the operational amplifier is connect with second Numerical Controlled Current Source；
The in-phase output end and reversed-phase output of the operational amplifier are connect with the numerical-control attenuator；
The first end of the first resistor device is connect with the high-voltage end of the digital control filter output signal, second end and institute
State the non-inverting input terminal connection of operational amplifier；
The first end of the 3rd resistor device is connect with the low-pressure end of the digital control filter output signal, second end and institute
State the inverting input terminal connection of operational amplifier；
The first end of the second resistor is connect with the non-inverting input terminal of the operational amplifier, second end and the fortune
Calculate the reversed-phase output connection of amplifier；
The first end of 4th resistor is connect with the inverting input terminal of the operational amplifier, second end and the fortune
Calculate the in-phase output end connection of amplifier.
Preferably, the first current signal of first Numerical Controlled Current Source flows into described second by the operational amplifier
Numerical Controlled Current Source.
Preferably, the second current signal of second Numerical Controlled Current Source flows into described first by the operational amplifier
Numerical Controlled Current Source.
Preferably, the medium-frequency band of the digital control filter is 0~40MHz.
Preferably, the calibration range of the numerical control differential mode direct current calibration unit is 0~1V.
Preferably, 0.5dB stepping decaying of the numerical-control attenuator for the input signal of 0~31.5dB.
Preferably, described device is the chip made by CMOS technology.
Preferably, described device is the chip made by germanium silicon technology.
Preferably, the input signal of the digital control filter is the output signal of frequency mixer.
Beneficial effects of the present invention are as follows:
The present invention can be such that digital control filter realizes 0 to 40MHz model by adjusting filter bandwidht digital controlled signal
Interior any filtering is enclosed, calibrates digital controlled signal and the second direct current calibration digital controlled signal by adjusting the first direct current, it can
Numerical control differential mode direct current calibration unit is set to realize that the direct current calibration within the scope of 0 to 1V is adjusted, by adjusting digital control letter of decaying
Number, numerical-control attenuator can be made to realize the attenuation function with 0.5dB stepping within the scope of 0 to 31.5dB.The present invention is by adopting
It is calibrated with numerical control differential mode direct current, the problem for causing misregistration signal excessive during can be avoided filtering interference signal, to make
Analog-digital converter can be sampled accurately, improve the sampling precision of analog-digital converter.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 shows a kind of structure of one specific embodiment of zero intermediate frequency filtering amplifying device with direct current calibration of the present invention
Figure.
Fig. 2 shows numerical controls in a kind of one specific embodiment of zero intermediate frequency filtering amplifying device with direct current calibration of the present invention
The circuit diagram of differential mode direct current calibration unit.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in Figure 1, present embodiment discloses a kind of zero intermediate frequency filtering amplifying devices with direct current calibration.The present embodiment
In, zero intermediate frequency filtering amplifying device include digital control filter 1, numerical control differential mode direct current calibration unit 2, the first Numerical Controlled Current Source 31,
Second Numerical Controlled Current Source 32, numerical-control attenuator 4, gain amplifier 5 and common mode direct current switching amplifier 6.
Wherein, the digital control filter 1 carries out bandwidth filter to input signal in response to filter bandwidht digital controlled signal
Wave；First Numerical Controlled Current Source 31 forms the first current signal in response to the first direct current calibration digital controlled signal；Described
Two Numerical Controlled Current Sources 32 form the second current signal in response to the second direct current calibration digital controlled signal；The numerical control differential mode direct current
Calibration unit 2 be used for according to first current signal and the second current signal to the output signal of the digital control filter 1 into
The calibration of row differential mode direct current；The numerical-control attenuator 4 calibrates the numerical control differential mode direct current in response to decaying digital controlled signal single
The output signal of member 2 carries out gain control；The gain amplifier 5 is used to carry out the output signal of the numerical-control attenuator 4
Amplification；The common mode direct current switching amplifier 6 is used to carry out the conversion of common mode direct current to the output signal of the gain amplifier 5.
At work, when inputting digital control filter 1 as input signal for the output signal of frequency mixer output, make first
With filter bandwidht digital controlled signal setting digital control filter 1 bandwidth, using the first direct current calibration digital controlled signal and
Second direct current calibrates the calibration voltage that digital controlled signal adjusts numerical control differential mode direct current calibration unit 2.It is digital control using decaying
The pad value of Signal Regulation numerical-control attenuator 4, then, signal enter digital control filter 1 and are filtered, and filtered signal enters
Numerical control differential mode direct current calibration unit 2 carries out the calibration of differential mode direct current, and the signal after calibration enters numerical-control attenuator 4 and carries out gain control
System, the signal after decaying enters gain amplifier 5 and amplifies, amplified signal enter common mode direct current switching amplifier 6 into
Row common mode direct current conversion, finally can input analog-to-digital converter sampled.
At work, digital control filter 1 can be made to realize 0 to 40MHz by adjusting filter bandwidht digital controlled signal
Any filtering in range calibrates digital controlled signal and the second direct current calibration digital controlled signal by adjusting the first direct current,
The direct current calibration that may be implemented in numerical control differential mode direct current calibration unit 2 within the scope of 0 to 1V is adjusted, digital control by adjusting decaying
Signal makes numerical-control attenuator 4 may be implemented in the attenuation function with 0.5dB stepping within the scope of 0 to 31.5dB.Using the present invention
Zero intermediate frequency filtering amplifying device, digital control filter 1 can be made to realize any filtering within the scope of 0 to 40MHz, make numerical control differential mode
Direct current calibration unit 2 is realized that the direct current within the scope of 0 to 1V is calibrated and is adjusted, and realizes numerical-control attenuator 40 to 31.5dB range
It is interior using 0.5dB as the attenuation function of stepping.
In a preferred embodiment, as shown in Fig. 2, the numerical control differential mode direct current calibration unit 2 include operational amplifier,
First resistor device R1, second resistor R2,3rd resistor device R3 and the 4th resistor R4.
Wherein, the non-inverting input terminal of the operational amplifier is connect with first Numerical Controlled Current Source 31, and the operation is put
The inverting input terminal of big device is connect with second Numerical Controlled Current Source 32, and the in-phase output end and reverse phase of the operational amplifier are defeated
Outlet is connect with the numerical-control attenuator 4, the first end of the first resistor device R1 and 1 output signal of digital control filter
High-voltage end (positive input) connection, second end are connect with the non-inverting input terminal of the operational amplifier, the 3rd resistor device R3's
First end is connect with the low-pressure end (negative input) of 1 output signal of digital control filter, second end and the operational amplifier
Inverting input terminal connection, the first end of the second resistor R2 are connect with the non-inverting input terminal of the operational amplifier, and second
End is connect with the reversed-phase output of the operational amplifier, first end and the operational amplifier of the 4th resistor R4
Inverting input terminal connection, second end are connect with the in-phase output end of the operational amplifier, the reversed-phase output of operational amplifier
For the positive output end of numerical control differential mode direct current calibration unit 2, the in-phase output end of operational amplifier is that the calibration of numerical control differential mode direct current is single
The negative output terminal of member 2.
In some embodiments, the first current signal of first Numerical Controlled Current Source 31 can pass through the operation amplifier
Device flows into second Numerical Controlled Current Source 32, such as the first current signal of the first Numerical Controlled Current Source 31 can be from fortune in the present embodiment
The non-inverting input terminal for calculating amplifier flows into, and enters the second Numerical Controlled Current Source 32 from the outflow of the inverting input terminal of operational amplifier.?
In other embodiments, the second current signal of second Numerical Controlled Current Source 32 can also flow into institute by the operational amplifier
The first Numerical Controlled Current Source 31 is stated, such as the second current signal of the second Numerical Controlled Current Source 32 can be from operational amplifier in the present embodiment
Inverting input terminal flow into, from the non-inverting input terminal of operational amplifier outflow enter the first Numerical Controlled Current Source 31.
In a preferred embodiment, identical numerical control can be used in the first Numerical Controlled Current Source 31 and the second Numerical Controlled Current Source 32
Current source, to save cost, convenient for control.
In some embodiments, described device can be the chip made by CMOS technology, can integrated numerical-control on chip
Filter 1, numerical control differential mode direct current calibration unit 2, the first Numerical Controlled Current Source 31, the second Numerical Controlled Current Source 32, numerical-control attenuator 4,
Gain amplifier 5 and common mode direct current switching amplifier 6.In other embodiments, described device can also be to pass through germanium silicon technology
The chip of production, can integrated numerical-control filter 1, numerical control differential mode direct current calibration unit 2, the first Numerical Controlled Current Source 31, on chip
Two Numerical Controlled Current Sources 32, numerical-control attenuator 4, gain amplifier 5 and common mode direct current switching amplifier 6.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the scope of protection of the present invention.
Claims (10)
1. a kind of zero intermediate frequency filtering amplifying device with direct current calibration, which is characterized in that including digital control filter, numerical control differential mode
Direct current calibration unit, the first Numerical Controlled Current Source, the second Numerical Controlled Current Source, numerical-control attenuator, gain amplifier and common mode direct current turn
Change amplifier；
Wherein, the digital control filter carries out bandwidth filtering to input signal in response to filter bandwidht digital controlled signal；Institute
It states the first Numerical Controlled Current Source and forms the first current signal in response to the first direct current calibration digital controlled signal；The second numerical control electricity
Stream source forms the second current signal in response to the second direct current calibration digital controlled signal；The numerical control differential mode direct current calibration unit is used
In carrying out differential mode direct current school according to the output signal of first current signal and the second current signal to the digital control filter
It is quasi-；The numerical-control attenuator in response to decaying digital controlled signal to the output signal of the numerical control differential mode direct current calibration unit into
Row gain control；The gain amplifier is for amplifying the output signal of the numerical-control attenuator；The common mode direct current
Switching amplifier is used to carry out the conversion of common mode direct current to the output signal of the gain amplifier.
2. zero intermediate frequency filtering amplifying device according to claim 1, which is characterized in that the numerical control differential mode direct current calibration is single
Member includes operational amplifier, first resistor device, second resistor, 3rd resistor device and the 4th resistor；
The non-inverting input terminal of the operational amplifier is connect with first Numerical Controlled Current Source；
The inverting input terminal of the operational amplifier is connect with second Numerical Controlled Current Source；
The in-phase output end and reversed-phase output of the operational amplifier are connect with the numerical-control attenuator；
The first end of the first resistor device is connect with the high-voltage end of the digital control filter output signal, second end and the fortune
Calculate the non-inverting input terminal connection of amplifier；
The first end of the 3rd resistor device is connect with the low-pressure end of the digital control filter output signal, second end and the fortune
Calculate the inverting input terminal connection of amplifier；
The first end of the second resistor is connect with the non-inverting input terminal of the operational amplifier, and second end is put with the operation
The reversed-phase output connection of big device；
The first end of 4th resistor is connect with the inverting input terminal of the operational amplifier, and second end is put with the operation
The in-phase output end connection of big device.
3. zero intermediate frequency filtering amplifying device according to claim 1, which is characterized in that the of first Numerical Controlled Current Source
One current signal flows into second Numerical Controlled Current Source by the operational amplifier.
4. zero intermediate frequency filtering amplifying device according to claim 1, which is characterized in that the of second Numerical Controlled Current Source
Two current signals flow into first Numerical Controlled Current Source by the operational amplifier.
5. zero intermediate frequency filtering amplifying device according to claim 1, which is characterized in that in the digital control filter again and again
Band is 0~40MHz.
6. zero intermediate frequency filtering amplifying device according to claim 1, which is characterized in that the numerical control differential mode direct current calibration is single
The calibration range of member is 0~1V.
7. zero intermediate frequency filtering amplifying device according to claim 1, which is characterized in that the numerical-control attenuator for 0~
The 0.5dB stepping of the input signal of 31.5dB decays.
8. zero intermediate frequency filtering amplifying device according to claim 1, which is characterized in that described device is to pass through CMOS technology
The chip of production.
9. zero intermediate frequency filtering amplifying device according to claim 1, which is characterized in that described device is to pass through germanium silicon technology
The chip of production.
10. zero intermediate frequency filtering amplifying device according to claim 1, which is characterized in that the input of the digital control filter
Signal is the output signal of frequency mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811533176.8A CN109687827A (en) | 2018-12-14 | 2018-12-14 | A kind of zero intermediate frequency filtering amplifying device with direct current calibration |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811533176.8A CN109687827A (en) | 2018-12-14 | 2018-12-14 | A kind of zero intermediate frequency filtering amplifying device with direct current calibration |
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| CN109687827A true CN109687827A (en) | 2019-04-26 |
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| CN201811533176.8A Pending CN109687827A (en) | 2018-12-14 | 2018-12-14 | A kind of zero intermediate frequency filtering amplifying device with direct current calibration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110719079A (en) * | 2019-10-17 | 2020-01-21 | 成都铭峰新源科技有限公司 | Signal amplification filtering conditioning card |
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| CN101944924A (en) * | 2010-09-30 | 2011-01-12 | 东南大学 | Broadband MIMO radio frequency transceiving system for next-generation wireless communication network |
| CN204168283U (en) * | 2014-09-19 | 2015-02-18 | 成都振芯科技股份有限公司 | The zero intermediate frequency narrow-band reception circuit that a kind of bandwidth is adjustable |
| CN205232209U (en) * | 2015-12-17 | 2016-05-11 | 深圳市金溢科技股份有限公司 | Signal reception circuit, phased array antenna and trackside unit based on zero intermediate frequency |
| CN105915192A (en) * | 2016-05-25 | 2016-08-31 | 东南大学 | Stepping-type automatic gain control system |
-
2018
- 2018-12-14 CN CN201811533176.8A patent/CN109687827A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998010523A1 (en) * | 1996-09-06 | 1998-03-12 | Philips Electronics N.V. | A zero-if receiver |
| CN101944924A (en) * | 2010-09-30 | 2011-01-12 | 东南大学 | Broadband MIMO radio frequency transceiving system for next-generation wireless communication network |
| CN204168283U (en) * | 2014-09-19 | 2015-02-18 | 成都振芯科技股份有限公司 | The zero intermediate frequency narrow-band reception circuit that a kind of bandwidth is adjustable |
| CN205232209U (en) * | 2015-12-17 | 2016-05-11 | 深圳市金溢科技股份有限公司 | Signal reception circuit, phased array antenna and trackside unit based on zero intermediate frequency |
| CN105915192A (en) * | 2016-05-25 | 2016-08-31 | 东南大学 | Stepping-type automatic gain control system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110719079A (en) * | 2019-10-17 | 2020-01-21 | 成都铭峰新源科技有限公司 | Signal amplification filtering conditioning card |
| CN110719079B (en) * | 2019-10-17 | 2023-06-27 | 成都铭峰新源科技有限公司 | Signal amplification filtering conditioning card |
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