CN110098807A - A kind of difference channel across resistance amplifying circuit - Google Patents
A kind of difference channel across resistance amplifying circuit Download PDFInfo
- Publication number
- CN110098807A CN110098807A CN201910151822.2A CN201910151822A CN110098807A CN 110098807 A CN110098807 A CN 110098807A CN 201910151822 A CN201910151822 A CN 201910151822A CN 110098807 A CN110098807 A CN 110098807A
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- Prior art keywords
- switching tube
- agc
- resistance
- inductance
- difference channel
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- 238000001914 filtration Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 11
- 230000006399 behavior Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
-
- 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
- H03F1/42—Modifications of amplifiers to extend the bandwidth
- H03F1/48—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers
- H03F1/483—Modifications of amplifiers to extend the bandwidth of aperiodic amplifiers with field-effect transistors
-
- 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
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
- H03F3/45197—Pl types
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/36—Indexing scheme relating to amplifiers the amplifier comprising means for increasing the bandwidth
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/372—Noise reduction and elimination in amplifier
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The present invention provides a kind of difference channels across resistance amplifying circuit, increase switching tube in passive inductance peaking difference channel；The signal that the switching tube is generated by hysteresis comparator circuit is controlled on or off；Two input terminals of the hysteresis comparator circuit input AGC voltage V respectivelyAGCWith the threshold voltage V of settingTH；When the input of trans-impedance amplifier is small signal, AGC voltage VAGCIt is 0, switching tube shutdown, circuit equivalent is passive inductance peaking difference channel；When the input of trans-impedance amplifier is small signal, AGC voltage VAGCGreater than threshold voltage VTH, switching tube conducting, switching tube is equivalent to resistance, is connected in parallel between the inductance L1 and L2 of two mirror image branch of passive inductance peaking difference channel.To solve using bandwidth Design after passive inductance peaking circuit, the design compromise of filtering performance characteristic and large signal characteristic, so that three's characteristic can be optimal solution.
Description
Technical field
The present invention relates to electronic circuit field more particularly to trans-impedance amplifiers.
Background technique
Trans-impedance amplifier is the electronic circuit that current signal is converted to voltage signal and is amplified, frequently as optic communication
The front-end circuit of chip is received, in order to reduce the susceptibility to power supply and Earth noise, the electric signal of conversion is necessary for differential signal.
And the effect of difference channel is:
1.TIA provides certain gain in small-signal operation, and guarantees enough bandwidth, to transmit prime signal.
2. to there is certain High frequency filter performance to filter out prime noise simultaneously.
3. guarantee TIA large signal operation, optimize big signal eye diagram, reduces DCD distortion and shake.
In the prior art, the circuit diagram of trans-impedance amplifier and difference amplifier is as depicted in figs. 1 and 2.
As shown in Figure 1, entire circuit is by across resistance front end amplifying circuit (TIA), single-turn dual circuit and differential signal channel group
At automatic gain control circuit (Auto Gain Control, AGC) is used to adjust TIA forward gain in big signal, and poor
Stage circuit uses the use passive inductance peaking technique difference channel such as Fig. 2.In Fig. 2, R1=R2=R, C1=C2=C, L1
=L2=L, M1 are identical with M2.
By adjusting R, L, C, by adjusting the position of peaking, the bandwidth and peak value of the adjustable TIA of size.
The shortcomings that this technology is that bandwidth Design can not be solved, and filtering performance characteristic is reasonable with large signal characteristic three's
Compromise.Wherein first two are small-signal behaviours, therefore can be summarized as small-signal behaviour can not reasonable tradeoff with large signal characteristic.
Such as:
1. need sufficiently large inductance to promote bandwidth, but if L1/L2 inductance is excessive, the eye figure of big signal
It can deteriorate, be embodied in the shake of eye figure greatly and DCD distortion is big or eye figure is seriously asymmetric.
2. needing C1/C2 sufficiently large to promote the High frequency filter characteristic of a figure, but also big signal eye diagram can be caused bad
Change.
The reason is that, passive inductance peaking can provide certain frequency peak to promote bandwidth, but in big signal, due to
The frequency peak of AGC work, TIA prime increases, and subsequent passive inductance peaking difference channel still provides certain peak value, from
And make the peak value of entire TIA circuit excessive, to influence big signal eye diagram quality.
Summary of the invention
The main technical problem to be solved by the present invention is to provide a kind of difference channels across resistance amplifying circuit, solve and adopt
With bandwidth Design after passive inductance peaking circuit, the design compromise of filtering performance characteristic and large signal characteristic, so that three's characteristic
Solution can be optimal.
In order to solve the above technical problems, the present invention provides a kind of difference channels across resistance amplifying circuit, passive
Increase switching tube in inductor peaking difference channel；The switching tube is controlled conducting by the signal that hysteresis comparator circuit generates or is closed
It is disconnected；Two input terminals of the hysteresis comparator circuit input AGC voltage V respectivelyAGCWith the threshold voltage V of settingTH；
When the input of trans-impedance amplifier is small signal, AGC voltage VAGCIt is 0, switching tube shutdown, circuit etc.
Effect is passive inductance peaking difference channel；
When the input of trans-impedance amplifier is small signal, AGC voltage VAGCGreater than threshold voltage VTH, switching tube
Conducting, switching tube is equivalent to resistance, be connected in parallel on two mirror image branch of passive inductance peaking difference channel inductance L1 and L2 it
Between.
In a preferred embodiment: the switching tube is PMOS tube, and grid is connected to the output end of hysteresis comparator circuit,
Source electrode is connected to the connecting pin of the inductance L1 and resistance R1 of the first mirror image branch, and drain electrode is connected to the inductance L2 of the second mirror image branch
With the connecting pin of resistance R2.
In a preferred embodiment: the switching tube is triode, and base stage is connected to the output end of hysteresis comparator circuit,
Emitter is connected to the connecting pin of the inductance L1 and resistance R1 of the first mirror image branch, and collector is connected to the electricity of the second mirror image branch
Feel the connecting pin of L2 and resistance R2.
Compared to the prior art, technical solution of the present invention have it is following the utility model has the advantages that
The present invention provides a kind of difference channels across resistance amplifying circuit, utilize AGC voltage VAGCAs control
Signal processed controls the switching tube of passive inductance peaking difference channel, so that difference channel small-signal behaviour and large signal characteristic table
Reveal different peak values, the reasonable tradeoff of small-signal behaviour (bandwidth characteristic, filtering performance) and large signal characteristic is realized with this.
Detailed description of the invention
Fig. 1 is the circuit diagram of trans-impedance amplifier in the prior art；
Fig. 2 is passive inductance peaking difference channel figure in the prior art；
Fig. 3 is the circuit diagram of trans-impedance amplifier in the embodiment of the present invention；
Fig. 4 is difference channel figure in the embodiment of the present invention；
Fig. 5 is the equivalent circuit diagram in the embodiment of the present invention after switching tube conducting；
Fig. 6 is the big signal eye diagram using the prior art；
Fig. 7 is using the big signal eye diagram after technology of the embodiment of the present invention.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
It is poor in passive inductance peaking the present invention provides a kind of difference channel across resistance amplifying circuit with reference to Fig. 3 and Fig. 4
Increase switching tube in parallel circuit；The signal that the switching tube is generated by hysteresis comparator circuit is controlled on or off；The sluggishness
Two input terminals of comparison circuit input AGC voltage V respectivelyAGCWith the threshold voltage V of settingTH；
Specifically, switching tube described in the present embodiment is PMOS tube PM1, and grid is connected to the defeated of hysteresis comparator circuit
Outlet, source electrode are connected to the connecting pin of the inductance L1 and resistance R1 of the first mirror image branch, and drain electrode is connected to the second mirror image branch
The connecting pin of inductance L2 and resistance R2.
1. the automatic gain of trans-impedance amplifier prime does not work, at this time V when input is small signalAGC-VTH< 0, VSW
=VDD, PM1, which is in, turns off area, and Fig. 4 is identical as Fig. 2 working principle at this time.
2. when input is big signal, the automatic gain work of trans-impedance amplifier prime, VAGCStart to become larger, works as VAGC-VTH-
VYS> 0 (, VYSFor the half of hysteresis comparator hysteresis range), VSW=0, PM1 work in linear zone, and PM1 is equivalent to one at this time
Small resistance, R0, with L1, L2 is in parallel.Its principle is as shown in Figure 5.
The reasonable tradeoff of small-signal behaviour and large signal characteristic can be realized by the technology.
1. when small signal, there is passive inductance peaking difference channel outstanding broadened bandwidth ability and high-frequency noise to filter energy
Power.
2. when big signal, passive inductance (L1/L2) is in parallel with R0 in difference channel, passive inductance peaking differential electrical can be reduced
Road peak value, to optimize big signal eye diagram.
Fig. 6 and Fig. 7 compares the big signal eye diagram of former technology and the technical program.As can be seen that Fig. 7 eye figure shake with
Symmetry all optimizes significantly with respect to Fig. 6.
As the simple replacement of the present embodiment, the switching tube may be triode, and base stage is connected to sluggish compare
The output end of circuit, emitter are connected to the connecting pin of the inductance L1 and resistance R1 of the first mirror image branch, and collector is connected to
The connecting pin of the inductance L2 and resistance R2 of two mirror image branch.Working principle is identical as PMOS tube, repeats no more.
The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and those skilled in the art can
To readily appreciate that variation disclosed in this invention or technical scope.Alternative solution is intended to cover within the scope of the invention.Cause
This, protection scope of the present invention should be determined by the scope of the claims.
Claims (3)
1. a kind of difference channel across resistance amplifying circuit, it is characterised in that: increase switch in passive inductance peaking difference channel
Pipe；The signal that the switching tube is generated by hysteresis comparator circuit is controlled on or off；Two of the hysteresis comparator circuit are defeated
Enter end and inputs AGC voltage V respectivelyAGCWith the threshold voltage V of settingTH；
When the input of trans-impedance amplifier is small signal, AGC voltage VAGCIt is 0, switching tube turns off, and circuit equivalent is
Passive inductance peaking difference channel；
When the input of trans-impedance amplifier is small signal, AGC voltage VAGCGreater than threshold voltage VTH, switching tube leads
Logical, switching tube is equivalent to resistance, is connected in parallel between the inductance L1 and L2 of two mirror image branch of passive inductance peaking difference channel.
2. a kind of difference channel across resistance amplifying circuit according to claim 1, it is characterised in that: the switching tube is
PMOS tube, grid are connected to the output end of hysteresis comparator circuit, and source electrode is connected to the inductance L1 and resistance of the first mirror image branch
The connecting pin of R1, drain electrode are connected to the connecting pin of the inductance L2 and resistance R2 of the second mirror image branch.
3. a kind of difference channel across resistance amplifying circuit according to claim 1, it is characterised in that: the switching tube is three
Pole pipe, base stage are connected to the output end of hysteresis comparator circuit, and emitter is connected to the inductance L1 and resistance of the first mirror image branch
The connecting pin of R1, collector are connected to the connecting pin of the inductance L2 and resistance R2 of the second mirror image branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910151822.2A CN110098807A (en) | 2019-02-28 | 2019-02-28 | A kind of difference channel across resistance amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910151822.2A CN110098807A (en) | 2019-02-28 | 2019-02-28 | A kind of difference channel across resistance amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110098807A true CN110098807A (en) | 2019-08-06 |
Family
ID=67443126
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910151822.2A Withdrawn CN110098807A (en) | 2019-02-28 | 2019-02-28 | A kind of difference channel across resistance amplifying circuit |
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| Country | Link |
|---|---|
| CN (1) | CN110098807A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114614908A (en) * | 2021-11-24 | 2022-06-10 | 杭州太明科技有限公司 | Optical receiver and trans-impedance amplifier chip thereof |
| CN116192062A (en) * | 2023-04-26 | 2023-05-30 | 成都观岩科技有限公司 | High-speed transimpedance amplifier chip based on automatic temperature compensation of small-signal high-frequency gain |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6429742B1 (en) * | 2001-06-29 | 2002-08-06 | Intel Corporation | Gain-controlled tuned differential adder |
| JP2004186842A (en) * | 2002-12-02 | 2004-07-02 | Nec Engineering Ltd | Differential amplifier circuit |
| US20060028275A1 (en) * | 2004-08-03 | 2006-02-09 | Scintera Networks, Inc. | Differential amplifier having independently tunable base gain, peak gain and boost frequency, and uses of same |
| US20090066394A1 (en) * | 2006-03-27 | 2009-03-12 | Fujitsu Limited | Peaking control circuit |
| CN101621283A (en) * | 2009-08-07 | 2010-01-06 | 天津泛海科技有限公司 | Amplitude detection and automatic gain control (AGC) circuit |
| JP2011091688A (en) * | 2009-10-23 | 2011-05-06 | Nippon Telegr & Teleph Corp <Ntt> | Transimpedance amplifier |
| CN102483984A (en) * | 2009-08-31 | 2012-05-30 | 高通股份有限公司 | Switchable inductor network |
| CN107302345A (en) * | 2017-06-29 | 2017-10-27 | 厦门优迅高速芯片有限公司 | One kind is applied to optic communication trans-impedance amplifier and is segmented auto-gain circuit |
| CN108173524A (en) * | 2018-02-08 | 2018-06-15 | 厦门亿芯源半导体科技有限公司 | Suitable for the double loop automatic gain control circuit of high bandwidth TIA |
| CN209627329U (en) * | 2019-02-28 | 2019-11-12 | 厦门优迅高速芯片有限公司 | Difference channel across resistance amplifying circuit |
-
2019
- 2019-02-28 CN CN201910151822.2A patent/CN110098807A/en not_active Withdrawn
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6429742B1 (en) * | 2001-06-29 | 2002-08-06 | Intel Corporation | Gain-controlled tuned differential adder |
| JP2004186842A (en) * | 2002-12-02 | 2004-07-02 | Nec Engineering Ltd | Differential amplifier circuit |
| US20060028275A1 (en) * | 2004-08-03 | 2006-02-09 | Scintera Networks, Inc. | Differential amplifier having independently tunable base gain, peak gain and boost frequency, and uses of same |
| US20090066394A1 (en) * | 2006-03-27 | 2009-03-12 | Fujitsu Limited | Peaking control circuit |
| CN101621283A (en) * | 2009-08-07 | 2010-01-06 | 天津泛海科技有限公司 | Amplitude detection and automatic gain control (AGC) circuit |
| CN102483984A (en) * | 2009-08-31 | 2012-05-30 | 高通股份有限公司 | Switchable inductor network |
| JP2011091688A (en) * | 2009-10-23 | 2011-05-06 | Nippon Telegr & Teleph Corp <Ntt> | Transimpedance amplifier |
| CN107302345A (en) * | 2017-06-29 | 2017-10-27 | 厦门优迅高速芯片有限公司 | One kind is applied to optic communication trans-impedance amplifier and is segmented auto-gain circuit |
| CN108173524A (en) * | 2018-02-08 | 2018-06-15 | 厦门亿芯源半导体科技有限公司 | Suitable for the double loop automatic gain control circuit of high bandwidth TIA |
| CN209627329U (en) * | 2019-02-28 | 2019-11-12 | 厦门优迅高速芯片有限公司 | Difference channel across resistance amplifying circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114614908A (en) * | 2021-11-24 | 2022-06-10 | 杭州太明科技有限公司 | Optical receiver and trans-impedance amplifier chip thereof |
| CN116192062A (en) * | 2023-04-26 | 2023-05-30 | 成都观岩科技有限公司 | High-speed transimpedance amplifier chip based on automatic temperature compensation of small-signal high-frequency gain |
| CN116192062B (en) * | 2023-04-26 | 2023-07-07 | 成都观岩科技有限公司 | High-speed transimpedance amplifier chip based on automatic temperature compensation of small-signal high-frequency gain |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20190806 |
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| WW01 | Invention patent application withdrawn after publication |