CN101621252B - Direct-current (DC) restoration and DC monitoring circuit - Google Patents
Direct-current (DC) restoration and DC monitoring circuit Download PDFInfo
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- CN101621252B CN101621252B CN2009100701000A CN200910070100A CN101621252B CN 101621252 B CN101621252 B CN 101621252B CN 2009100701000 A CN2009100701000 A CN 2009100701000A CN 200910070100 A CN200910070100 A CN 200910070100A CN 101621252 B CN101621252 B CN 101621252B
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Abstract
The invention relates to a direct-current (DC) restoration and DC monitoring circuit comprising a transimpedance amplifier, a DC restoration circuit and a DC monitoring circuit. The transimpedance amplifier is connected with the DC restoration circuit and the DC monitoring circuit, and the integrator theory is applied to the DC restoration circuit and the DC monitoring circuit. The gain of an integrator at a low-frequency stage can achieve the open loop gain of an operational amplifier and ensures an input DC current to completely flow through the DC restoration circuit but not flow through the transimpedance amplifier; the gain of the integrator is extremely low at a high-frequency stage and can not generate great influence on signal amplification. A Wilson current mirror is applied to copy a monitoring current and ensures that the error of the copied current is smaller than 2 per thousand, in addition, the output of the monitoring current can be a current sink or a power supply.
Description
Technical field
The invention belongs to optical communication field and IC design field, particularly a kind of direct current recovers and the direct current monitoring circuit.
Background technology
Optical fiber communication is to be information carrier with light; Optical fiber is as a kind of communication mode of transmission medium; Optical fiber communication relates to fields such as optical-fiber network, photoelectric device and microelectronic circuit, and wherein microelectronic circuit is the interface that connects optical-fiber network and user terminal, is the bottleneck of present optical communication industry development.The microelectronic integrated circuit that is applied to optical communication network mainly comprises preamplifier, limiting amplifier, clock and data recovery circuit, coupler and multiplexer etc.Wherein preamplifier directly links to each other with photoelectric detector, and photoelectric detector is transformed into electric current with the light signal of input, and this current signal obtains the correspondent voltage signal through preposition trans-impedance amplifier amplification.Because preamplifier requires low noise and high bandwidth, so preamplifier generally adopts the trans-impedance amplifier design.The current signal that preamplifier receives is a current signal that is comprising flip-flop; This direct current flows through trans-impedance amplifier and can cause the common-mode voltage of the input and output of trans-impedance amplifier to have bigger pressure reduction; Thereby can produce bigger distortion at post-amplifier, have influence on back level Signal Processing.For this reason; Here designed a DC restoration circuit, this DC restoration circuit can bypass the DC component of input current signal, has only alternating current to flow through trans-impedance amplifier; The input and output signal of guaranteeing trans-impedance amplifier is on identical common mode electrical level, with minimal distortion.And, for the luminous power to network is kept watch on, need survey and keep watch on, so DC restoration circuit be general and monitoring circuit occurs jointly the direct current of photoelectric detector.
In the trans-impedance amplifier that high speed optical communication is used, all exist direct current and recover and the monitoring circuit module at present.But its direct current restoring current is not to equate accurately with the direct current photoelectric current of input, and its standby current generally is about 10% with the error of input photoelectric current.Because the restriction of standby current precision, the function for monitoring of existing chip can only be made light one and apply, and can't do luminous power and keep watch on usefulness.And its standby current generally is to obtain through the form of access resistance between power supply and monitoring point with current source, or obtains with the heavy mode of electric current through between monitoring point and earth potential, inserting resistance.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of direct current to recover and the direct current monitoring circuit.Guarantee that the direct current of importing flows through DC restoration circuit fully and can not flow through trans-impedance amplifier,, can not decay signal at high band.
Technical scheme of the present invention is:
A kind of direct current recovers and the direct current monitoring circuit; It is characterized in that: trans-impedance amplifier connects DC restoration circuit; Trans-impedance amplifier connects the direct current monitoring circuit, and DC restoration circuit and direct current monitoring circuit have all been used the integrator principle, and the direct current monitoring circuit also comprises a wilson current mirror; Trans-impedance amplifier, the current conversion that will flow through photodetector becomes voltage to export; DC restoration circuit is used for the direct current that by-pass is crossed photodetector; The direct current monitoring circuit is kept watch on the direct current that flows through photodetector; Integrator is for described direct current monitoring circuit and DC restoration circuit provide high low-frequency gain; Said wilson current mirror, the direct current that the direct current monitoring circuit is obtained carries out high accuracy and duplicates, and for adopting heavy photoelectric current the supervision with the current source structure of electric current necessary condition is provided; Described DC restoration circuit; It mainly recovers transistor by integrator, low pass filter and direct current and constitutes; This low pass filter is got the DC voltage component PINA_DC of trans-impedance amplifier input signal, and is given to the in-phase input end of integrator to this component of voltage; The inverting input of integrator links to each other with the trans-impedance amplifier output through resistance R 2, and is connected with the output of this integrator through an electric capacity, and bigger gain is provided when low frequency, and gain is very little during high frequency; The output of integrator is connected to the grid of DC restoration circuit output transistor M1, the source ground of M1, and drain electrode links to each other with the current input terminal of photodetector; Formed negative feedback; Guarantee that the output of trans-impedance amplifier and the voltage of input equate, all direct currents all flow through DC restoration circuit and can not flow through trans-impedance amplifier, and PINA_DC is trans-impedance amplifier input signal PINA through the DC voltage component behind the low pass filter of being made up of resistance R 1 and capacitor C 1; Wherein signal PINA is input to an end of resistance R 1; The other end of resistance R 1 connects an end of capacitor C 1, the other end ground connection of capacitor C 1, the output dc voltage component PINA_DC of tie point place of resistance R 1 and capacitor C 1; Owing to do not have DC channel on the resistance R 1; Therefore the direct current pressure drop on the resistance R 1 is zero, and PINA equates that with the direct voltage of 2 of PINA_DC promptly the drain voltage of DC restoration circuit output transistor M1 equates with PINA_DC voltage;
The shared same integrator of said direct current monitoring circuit and DC restoration circuit; The output of this integrator is connected on respectively on the grid of output transistor M1 of grid and DC restoration circuit of direct current monitoring circuit output transistor M7; Guarantee that two transistorized grid voltages equate; The source electrode of while direct current monitoring circuit output transistor M7 and the source grounding of DC restoration circuit output transistor M1; Guarantee that two transistorized source class voltages also equate, so just guarantee output transistor gate source voltage equal of DC restoration circuit output transistor and direct current monitoring circuit;
Said direct current monitoring circuit also comprises a voltage follower; The normal phase input end of voltage follower is got the DC voltage component PINA_DC of trans-impedance amplifier input signal; The output of voltage follower connects the drain electrode of direct current monitoring circuit output transistor M7; Because voltage follower itself has the effect that output voltage equals its positive terminal input voltage; The drain voltage that has guaranteed direct current monitoring circuit output transistor M7 like this equates that with PINA_DC voltage DC restoration circuit output transistor M1 drain voltage and direct current monitoring circuit output transistor M7 drain voltage equate, guarantee that DC restoration circuit equates with direct current monitoring circuit electric current.
Effect of the present invention is:
DC restoration circuit and monitoring circuit have been used the principle of integrator; Can reach the open-loop gain of operational amplifier in the gain of this integrator of low-frequency range; Guarantee that the direct current of importing flows through DC restoration circuit fully and can not flow through trans-impedance amplifier; At high band, the gain of this integrator is very low, can the amplification of signal not exerted an influence.Used wilson current mirror standby current duplicated, guaranteed the replica current error below 2/1000ths, and the output of this standby current both can be electric current heavy also can be current source.
This direct current recovers to be mainly reflected in direct current monitoring circuit effect; The precision of direct current restoring current and standby current is very high; The error of using preceding this standby current of the present invention and input average light electric current is about 10%; After using the present invention, the worst error of the average light electric current of standby current and input is less than 2/1000ths.Table 1 has provided the simulation result of average light electric current and standby current; Can find out that from simulation result behind application the present invention, the precision of standby current has been enhanced near two one magnitude; Its worst error can satisfy luminous power and keep watch on the requirement to precision also only less than 1uA.In addition, owing to introduced wilson current mirror, this standby current can have two kinds of connected modes to obtain, and between this dual mode without any need for other operations.
Input of table 1 average light electric current and standby current output simulation result
Description of drawings
Fig. 1 is trans-impedance amplifier of the present invention and DC restoration circuit
Fig. 2 is a direct current monitoring circuit of the present invention
Embodiment
A kind of direct current recovers and monitoring circuit, comprises following circuit
Trans-impedance amplifier, the current conversion that will flow through photodetector becomes voltage to export.
DC restoration circuit is used for the direct current that by-pass is crossed photoelectric detector.
The direct current monitoring circuit is kept watch on the direct current that flows through photodetector.
Integrator links to each other with monitoring circuit with described DC restoration circuit, for this monitoring circuit and DC restoration circuit provide high low-frequency gain, and under high frequency the formation buffer.
Wilson current mirror links to each other with described direct current monitoring circuit, and the direct current that monitoring circuit is obtained carries out high accuracy and duplicates, and for adopting the electric current sink structure that photoelectric current is kept watch on possibility is provided.
Heavy or the current source monitoring circuit of electric current, the user encapsulates this monitoring circuit for ease, and monitoring circuit has been designed to the heavy and optional structure of current source of electric current here, and the user can connect according to connecting custom.
Described DC restoration circuit, it mainly is made up of integrator, low pass filter and direct current recovery transistor, and this low pass filter is got the DC voltage component of input signal, and is given to the in-phase input end of integrator to this component of voltage.The reverse input end of integrator links to each other with the trans-impedance amplifier output, and is connected with its output through electric capacity, and bigger gain is provided when low frequency, and gain is very little during high frequency.Direct current recovers transistorized grid and links to each other with the output of integrator; Drain electrode links to each other with the current input terminal of photo-detector; Formed negative feedback, guaranteed that the output of trans-impedance amplifier and input equate that all direct currents all stayed DC restoration circuit and can not flow through trans-impedance amplifier.
The shared same integrator of said direct current monitoring circuit and DC restoration circuit, the output of this integrator is connected on respectively on the output transistor of direct current monitoring circuit and DC restoration circuit, guarantees that the electric current that two output transistors flow through equates.
Said this direct current monitoring circuit comprises a negative feedback operational amplifier and a wilson current mirror; This negative feedback amplifier can guarantee that direct current restoring current and standby current equate; Wilson current mirror has improved the precision of replica current, guarantees that standby current can adopt electric current form heavy or current source to connect easily.
The present invention can realize what direct current recovery and direct current were kept watch on through following technical scheme.The signal of importing through a low pass filter, is got the dc point of input signal.The signal of input is exported trans-impedance amplifier the common-mode point of signal and is taken out after amplifying through trans-impedance amplifier.Input signal is input in the operational amplifier of open loop under the low frequency with the common-mode point of output signal.According to the principle of operational amplifier, the common-mode voltage of two inputs is equal basically, guarantees that the input and output side common-mode voltage of trans-impedance amplifier equates, does not promptly have direct current to flow through trans-impedance amplifier.Simultaneously, the output of operational amplifier is connected on the output transistor gates of DC restoration circuit, and the drain electrode of output transistor directly links to each other with input, all flows out from output transistor to guarantee direct current.Its direct current restoring current provides standby current through the current mirror mirror image.Its standby current process wilson current mirror is mirror image again, so standby current both can be that current source also can be that electric current is heavy.
Below in conjunction with accompanying drawing to specific embodiment of the invention further explain.
Trans-impedance amplifier and DC restoration circuit functional block diagram that Fig. 1 designs for the present invention; The light signal of input is through behind the photodiode; Convert light signal into current signal, this current signal is flowed through behind the trans-impedance amplifier that amplifier A1 and resistance R F form, and is transformed into voltage signal and exports through OUT.Resistance R 1 has been formed low pass filter with C1, can obtain importing the common-mode voltage PINA_DC of node.Operational amplifier A 2, resistance R 2 and capacitor C 2 have been formed an integrator, and this integrator has very high gain under low frequency, and high frequency gain down is very low.The in-phase input end of operational amplifier A 2 links to each other with the common-mode voltage PINA_DC of trans-impedance amplifier input point, and inverting input links to each other with the output of trans-impedance amplifier.Under low frequency, the high dc gain of operational amplifier A 2 can guarantee that its two input common-mode voltages are equal basically, so direct current do not flow through resistance R F, flows out but recover output transistor M1 through direct current.The output VO_DC of operational amplifier A 2 is according to its two input terminal voltage extents, and the electric current of adjustment output transistor M1 guarantees that the direct current of photodiode flows away through IDC_restore fully.
Fig. 2 is the photoelectric current monitoring circuit that the present invention designs, and the in-phase input end of operational amplifier A links to each other with PINA_DC, and its output directly links to each other with inverting input, and this has formed a voltage follower, guarantees that output voltage equates with PINA_DC.M7 in the monitoring circuit and M2 transistor mirror are as the direct current restoring current; This electric current can obtain from power supply through resistance R 1, i.e. IMON_source at the drain terminal of transistor M7; Also can pass through the wilson current mirror of forming by M3-M6; From the drain terminal of M5, obtain between process resistance R 2 and the ground, i.e. IMON_sink.
Claims (1)
1. a direct current recovers and the direct current monitoring circuit, it is characterized in that:
Trans-impedance amplifier connects DC restoration circuit, and trans-impedance amplifier connects the direct current monitoring circuit, and DC restoration circuit and direct current monitoring circuit have all been used the integrator principle, and the direct current monitoring circuit also comprises a wilson current mirror;
Trans-impedance amplifier, the current conversion that will flow through photodetector becomes voltage to export;
DC restoration circuit is used for the direct current that by-pass is crossed photodetector;
The direct current monitoring circuit is kept watch on the direct current that flows through photodetector;
Integrator is for described direct current monitoring circuit and DC restoration circuit provide high low-frequency gain;
Said wilson current mirror, the direct current that the direct current monitoring circuit is obtained carries out high accuracy and duplicates, and for adopting heavy photoelectric current the supervision with the current source structure of electric current necessary condition is provided;
Described DC restoration circuit; It mainly recovers transistor by integrator, low pass filter and direct current and constitutes; This low pass filter is got the DC voltage component PINA_DC of trans-impedance amplifier input signal, and is given to the in-phase input end of integrator to this component of voltage; The inverting input of integrator links to each other with the trans-impedance amplifier output through resistance R 2, and is connected with the output of this integrator through an electric capacity, and bigger gain is provided when low frequency, and gain is very little during high frequency; The output of integrator is connected to the grid of DC restoration circuit output transistor M1, the source ground of M1, and drain electrode links to each other with the current input terminal of photodetector; Formed negative feedback; Guarantee that the output of trans-impedance amplifier and the voltage of input equate, all direct currents all flow through DC restoration circuit and can not flow through trans-impedance amplifier, and PINA_DC is trans-impedance amplifier input signal PINA through the DC voltage component behind the low pass filter of being made up of resistance R 1 and capacitor C 1; Wherein signal PINA is input to an end of resistance R 1; The other end of resistance R 1 connects an end of capacitor C 1, the other end ground connection of capacitor C 1, the output dc voltage component PINA_DC of tie point place of resistance R 1 and capacitor C 1; Owing to do not have DC channel on the resistance R 1; Therefore the direct current pressure drop on the resistance R 1 is zero, and PINA equates that with the direct voltage of 2 of PINA_DC promptly the drain voltage of DC restoration circuit output transistor M1 equates with PINA_DC voltage;
The shared same integrator of said direct current monitoring circuit and DC restoration circuit; The output of this integrator is connected on respectively on the grid of output transistor M1 of grid and DC restoration circuit of direct current monitoring circuit output transistor M7; Guarantee that two transistorized grid voltages equate; The source electrode of while direct current monitoring circuit output transistor M7 and the source grounding of DC restoration circuit output transistor M1; Guarantee that two transistorized source class voltages also equate, so just guarantee output transistor gate source voltage equal of DC restoration circuit output transistor and direct current monitoring circuit;
Said direct current monitoring circuit also comprises a voltage follower; The normal phase input end of voltage follower is got the DC voltage component PINA_DC of trans-impedance amplifier input signal; The output of voltage follower connects the drain electrode of direct current monitoring circuit output transistor M7; Because voltage follower itself has the effect that output voltage equals its positive terminal input voltage; The drain voltage that has guaranteed direct current monitoring circuit output transistor M7 like this equates that with PINA_DC voltage DC restoration circuit output transistor M1 drain voltage and direct current monitoring circuit output transistor M7 drain voltage equate, guarantee that DC restoration circuit equates with direct current monitoring circuit electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100701000A CN101621252B (en) | 2009-08-07 | 2009-08-07 | Direct-current (DC) restoration and DC monitoring circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100701000A CN101621252B (en) | 2009-08-07 | 2009-08-07 | Direct-current (DC) restoration and DC monitoring circuit |
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| Publication Number | Publication Date |
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| CN101621252A CN101621252A (en) | 2010-01-06 |
| CN101621252B true CN101621252B (en) | 2012-11-14 |
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| CN2009100701000A Expired - Fee Related CN101621252B (en) | 2009-08-07 | 2009-08-07 | Direct-current (DC) restoration and DC monitoring circuit |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890177B (en) * | 2012-09-29 | 2015-11-18 | 武汉昊昱微电子股份有限公司 | A kind of signal strength detection circuit of trans-impedance amplifier |
| CN104852763B (en) * | 2015-04-08 | 2017-07-11 | 厦门优迅高速芯片有限公司 | A kind of circuit that average light power is detected at PINA ends |
| CN107317637B (en) * | 2016-04-26 | 2020-10-27 | 苏州旭创科技有限公司 | Light receiving module and optical module |
| CN111327282B (en) * | 2018-12-17 | 2024-02-20 | 深圳市中兴微电子技术有限公司 | Control circuit, transimpedance amplifying circuit and control method |
| WO2020177081A1 (en) * | 2019-03-05 | 2020-09-10 | 深圳市傲科光电子有限公司 | Trans-impedance amplifier and trans-impedance amplifier circuit |
| CN112803902B (en) * | 2020-12-29 | 2023-11-24 | 江苏集萃微纳自动化系统与装备技术研究所有限公司 | Direct current recovery circuit easy for monolithic integration |
| CN113670345B (en) * | 2021-08-10 | 2023-09-15 | 之江实验室 | Low-noise photoelectric detection device for photoelectric current signal decomposition |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0102174A2 (en) * | 1982-07-26 | 1984-03-07 | Western Electric Company, Incorporated | Improvements in or relating to transimpedance amplifiers |
| US6684032B1 (en) * | 1999-03-19 | 2004-01-27 | Kabushiki Kaisha Toshiba | Optical signal receiver apparatus |
| CN101141049A (en) * | 2007-05-23 | 2008-03-12 | 中兴通讯股份有限公司 | Laser automatic optical power control circuit |
| CN201191835Y (en) * | 2008-04-03 | 2009-02-04 | 上海澳润信息科技有限公司 | Indoor light receiver |
-
2009
- 2009-08-07 CN CN2009100701000A patent/CN101621252B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0102174A2 (en) * | 1982-07-26 | 1984-03-07 | Western Electric Company, Incorporated | Improvements in or relating to transimpedance amplifiers |
| US6684032B1 (en) * | 1999-03-19 | 2004-01-27 | Kabushiki Kaisha Toshiba | Optical signal receiver apparatus |
| CN101141049A (en) * | 2007-05-23 | 2008-03-12 | 中兴通讯股份有限公司 | Laser automatic optical power control circuit |
| CN201191835Y (en) * | 2008-04-03 | 2009-02-04 | 上海澳润信息科技有限公司 | Indoor light receiver |
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| CN101621252A (en) | 2010-01-06 |
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