CN102751953A - Trans-impedance amplifier with stability compensation device for optical communication - Google Patents
Trans-impedance amplifier with stability compensation device for optical communication Download PDFInfo
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- CN102751953A CN102751953A CN2012102488735A CN201210248873A CN102751953A CN 102751953 A CN102751953 A CN 102751953A CN 2012102488735 A CN2012102488735 A CN 2012102488735A CN 201210248873 A CN201210248873 A CN 201210248873A CN 102751953 A CN102751953 A CN 102751953A
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Abstract
The invention provides a trans-impedance amplifier with a stability compensation device for optical communication. As for a generally adopted common-source trans-impedance amplifier including an AGC (automatic gain control) circuit, when large signals are inputted, the AGC circuit is in operation, trans-impedance becomes lower, right shift of a dominant pole becomes larger, and loop phase margin becomes poorer, so that a loop is unstable, and outputted eye pattern quality becomes poorer. The trans-impedance amplifier comprises a common-source amplifier body, a triode Q1 is parallelly connected to a load resistor RL of the common-source amplifier body, a collector electrode of the triode Q1 is connected to a power supply, an emitter electrode of the triode Q1 is connected with one end of the RL, and a base electrode of the triode Q1 is connected to a set potential VBIAS. The trans-impedance amplifier is applied to a receiving module of an optical communication system. When input signals of the trans-impedance amplifier are increased to a specific value, actual load resistance becomes less, open-loop gain of the loop is lowered, and phase margin is constantly larger than 60 degrees to enable the loop to be constantly kept stable.
Description
Technical field
The present invention relates to a kind of optical communication trans-impedance amplifier, belong to microelectronics technology with stabiloity compensation device.
Background technology
Trans-impedance amplifier is used for the optical communication system receiver module, and it accomplishes the function that the weak current that photodiode is produced is enlarged into voltage signal.Most important two parameters of trans-impedance amplifier are sensitivity electric current and overload current.The sensitivity electric current has reflected the minimum signal disposal ability of trans-impedance amplifier, and noise, the signal bandwidth of it and trans-impedance amplifier have confidential relation; Overload current has reflected the peak signal disposal ability of trans-impedance amplifier.The two has constituted the dynamic range of trans-impedance amplifier, and dynamic range is big more, and the ability of trans-impedance amplifier identification, processing light signal is strong more.Usually adopt AGC (control of automatic gain control automatic gain) technology in order to realize great dynamic range, as shown in Figure 1, promptly when large-signal is imported, reduce and stride resistance and distort to avoid exporting signal.For the commonsource amplifier of common employing, dominant pole is by striding resistance Rf and input capacitance CT decision, and inferior limit is by commonsource amplifier load resistance RL and node capacitor CL decision, and is as shown in Figure 2.When large-signal was imported, agc circuit work was striden resistance and is diminished, and dominant pole moves to right and becomes big, and loop phase nargin variation for example becomes 10 degree by 60 degree, and as shown in Figure 3, loop is unstable, output eye diagram quality variation.
Summary of the invention
The objective of the invention is provides a kind of optical communication trans-impedance amplifier with stabiloity compensation device to the problem of above-mentioned existence, can realize that loop still keeps stable under the big input signal condition, and simple in structure, and cost is low.
Above-mentioned purpose realizes through following technical scheme:
Optical communication trans-impedance amplifier with stabiloity compensation device; Comprise the commonsource amplifier main body; The parallelly connected triode Q1 in load resistance RL place of described commonsource amplifier cylinder; The collector electrode of described triode Q1 is connected to power supply, and emitter is connected with RL one end, and base stage is connected to a fixed potential VBIAS.
Described optical communication trans-impedance amplifier with stabiloity compensation device, described fixing point position VBIAS are controlled Q1 and are flow through electric current less than 1uA when no signal is imported.
Beneficial effect:
The present invention at the load resistance RL place of common source trans-impedance amplifier a parallelly connected triode Q1, triode Q1 collector electrode is connected to power supply, emitter is connected with RL one end, base stage is connected to a fixed potential VBIAS.Electric current very little (approximate cut-off state) among the Q1 flows through mA rank electric current when guaranteeing the small-signal input among the Q1 during large-signal.Because along with the increase of the input signal of trans-impedance amplifier, trans-impedance amplifier output OUT voltage decreases is got at VBIAS under the situation of certain value; Along with increasing Q1, input signal becomes conducting state from cut-off state; When triode Q1 was in conducting state, the resistance of seeing into from the Q1 emitter-base bandgap grading was R=(kT/q)/I, T=300K; During I=1mA, R=26ohm.So when the input signal of trans-impedance amplifier become greater to certain value; Actual loading resistance (RL||R); The loop open-loop gain diminishes, and greater than 60 degree, loop open-loop gain as shown in Figure 4 is reduced to 17dB by 30dB to phase margin all the time; Phase margin becomes 74 degree by 60 degree, and loop remains stable.
2. the present invention can realize large-signal initial conditions loop stability, thereby has widened the input dynamic range of trans-impedance amplifier, and is simple in structure, applied range.
Description of drawings
The schematic diagram of the automatic gain control of mentioning in Fig. 1, the background technology of the present invention.
The circuit theory diagrams of Fig. 2, existing common source trans-impedance amplifier.
Fig. 3, existing common source trans-impedance amplifier are when large-signal is imported, and agc circuit work is striden resistance and diminished, and dominant pole moves to right and becomes big, and loop phase nargin is become the phase diagram of 10 degree by 60 degree.
Fig. 4, structural representation of the present invention.
When Fig. 5, trans-impedance amplifier of the present invention become greater to certain value when the input signal of trans-impedance amplifier, actual loading resistance (RL||R), the loop open-loop gain is reduced to 17dB by 30dB, and phase margin is become the phase diagram of 74 degree by 60 degree.
Embodiment
Below in conjunction with accompanying drawing and embodiment, further illustrate the present invention.
Embodiment 1:
Shown in accompanying drawing 4: the optical communication trans-impedance amplifier with stabiloity compensation device of the present invention; Comprise the commonsource amplifier main body; The parallelly connected triode Q1 in load resistance RL place of described commonsource amplifier cylinder; The collector electrode of described triode Q1 is connected to power supply, and emitter is connected with RL one end, and base stage is connected to a fixed potential VBIAS.When the value of VBIAS need guarantee the input of small-signal even no signal among the Q1 electric current very little, greatly about 1uA or less than 1uA, during the small-signal current input; It is very little to flow through electric current among the feedback resistance Rf; Think Vin ≈ Vout this moment, so the transmitting terminal voltage of Q1 approximates Vout+Vbe1=Vin+Vbe1, for guaranteeing that electric current is about 1uA among the Q1; With VBIAS=Vin+Vbe1+Vbe (Q1=1uA); Vbe1 is the Vbe voltage that output OUT connects the NPN triode, and this formula is a rough estimation equation, and concrete accurately value need rely on the emulation adjustment.When outside large-signal electric current input Iin, this moment Vout < Vin, Vin-Vout=Iin * Rf '; Rf ' is that resistance is striden in the equivalence that this moment, agc circuit was had an effect; Because the VBIAS value remains unchanged always, this moment Vbe (Q1)=VBIAS-(Vout+Vbe1)=Iin * Rf '+Vbe (Q1=1uA), it is big that the Vbe voltage of Q1 becomes; So the electric current of Q1 is index and rises, the resistance of seeing into from the Q1 emitter-base bandgap grading.
Embodiment 2:
Described optical communication trans-impedance amplifier with stabiloity compensation device, described fixing point position VBIAS are controlled Q1 and are flow through electric current less than 1uA when no signal is imported.
Through above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the specification.Unaccomplished matter of the present invention belongs to those skilled in the art's common practise.
Claims (2)
1. optical communication trans-impedance amplifier with stabiloity compensation device; Comprise the commonsource amplifier main body; It is characterized in that: the parallelly connected triode Q1 in load resistance RL place of described commonsource amplifier cylinder; The collector electrode of described triode Q1 is connected to power supply, and emitter is connected with RL one end, and base stage is connected to a fixed potential VBIAS.
2. the optical communication trans-impedance amplifier with stabiloity compensation device according to claim 1 is characterized in that: described fixing point position VBIAS controls Q1 and flows through electric current less than 1uA when no signal is imported.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102488735A CN102751953A (en) | 2012-07-18 | 2012-07-18 | Trans-impedance amplifier with stability compensation device for optical communication |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102488735A CN102751953A (en) | 2012-07-18 | 2012-07-18 | Trans-impedance amplifier with stability compensation device for optical communication |
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| CN102751953A true CN102751953A (en) | 2012-10-24 |
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| CN2012102488735A Pending CN102751953A (en) | 2012-07-18 | 2012-07-18 | Trans-impedance amplifier with stability compensation device for optical communication |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105897195A (en) * | 2016-05-26 | 2016-08-24 | 千度芯通（厦门）微电子科技有限公司 | Burst mode trans-impedance amplifiers in high dynamic range |
| CN106253859A (en) * | 2016-08-01 | 2016-12-21 | 中国电子科技集团公司第二十四研究所 | A kind of photo-detector and assembly thereof and photoelectricity front-end amplifier circuit |
| US10680566B2 (en) | 2015-10-23 | 2020-06-09 | Hewlett Packard Enterprise Development Lp | Noise-canceling transimpedance amplifier (TIA) systems |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5363064A (en) * | 1992-04-24 | 1994-11-08 | Sumitomo Electric Industries, Ltd. | Preamplifier for optical communication having a gain control circuit |
| US7157977B2 (en) * | 2003-11-24 | 2007-01-02 | Electronics And Telecommunications Research Institute | Automatic gain control feedback amplifier |
| CN202059373U (en) * | 2011-05-19 | 2011-11-30 | 佛山敏石芯片有限公司 | Front-end circuit of transimpedance amplifier |
| CN202759417U (en) * | 2012-07-18 | 2013-02-27 | 南京国睿嘉源微电子有限公司 | Photo-communication trans-impedance amplifier with stable compensation device |
-
2012
- 2012-07-18 CN CN2012102488735A patent/CN102751953A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5363064A (en) * | 1992-04-24 | 1994-11-08 | Sumitomo Electric Industries, Ltd. | Preamplifier for optical communication having a gain control circuit |
| US7157977B2 (en) * | 2003-11-24 | 2007-01-02 | Electronics And Telecommunications Research Institute | Automatic gain control feedback amplifier |
| CN202059373U (en) * | 2011-05-19 | 2011-11-30 | 佛山敏石芯片有限公司 | Front-end circuit of transimpedance amplifier |
| CN202759417U (en) * | 2012-07-18 | 2013-02-27 | 南京国睿嘉源微电子有限公司 | Photo-communication trans-impedance amplifier with stable compensation device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10680566B2 (en) | 2015-10-23 | 2020-06-09 | Hewlett Packard Enterprise Development Lp | Noise-canceling transimpedance amplifier (TIA) systems |
| CN105897195A (en) * | 2016-05-26 | 2016-08-24 | 千度芯通（厦门）微电子科技有限公司 | Burst mode trans-impedance amplifiers in high dynamic range |
| CN105897195B (en) * | 2016-05-26 | 2018-12-28 | 千度芯通（厦门）微电子科技有限公司 | High dynamic range burst mode trans-impedance amplifier |
| CN106253859A (en) * | 2016-08-01 | 2016-12-21 | 中国电子科技集团公司第二十四研究所 | A kind of photo-detector and assembly thereof and photoelectricity front-end amplifier circuit |
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Address after: 210019, 10, Dajiang Road, Yuhua Economic and Technological Development Zone, Nanjing, Jiangsu Applicant after: Nanjing Meichen Microelectronic Co., Ltd. Address before: 210019, Jiangsu Province, Jianye District, Nanjing Jiangdong Road, No. 359, Rui country building on the west side of the 23 floor Applicant before: Nanjing Guorui Jiayuan Microelectronics Co.,Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: NANJING GUORUI JIAYUAN MICROELECTRONICS CO., LTD. TO: NANJING MEICHEN MICROELECTRONIC CO., LTD. |
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Application publication date: 20121024 |