CN201584972U - Optical receiving module with large dynamic range and low noise - Google Patents
Optical receiving module with large dynamic range and low noise Download PDFInfo
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- CN201584972U CN201584972U CN2009202513285U CN200920251328U CN201584972U CN 201584972 U CN201584972 U CN 201584972U CN 2009202513285 U CN2009202513285 U CN 2009202513285U CN 200920251328 U CN200920251328 U CN 200920251328U CN 201584972 U CN201584972 U CN 201584972U
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Abstract
The utility model relates to an optical receiving module with large dynamic range and low noise for the photoelectric transformation in the field of the short wave analog optical communication, comprising a photodiode PD, a resistor feedback Rf, a capacitor feedback Cf, a decoupling capacitor C+, a decoupling capacitor C-, a blocking capacitor Cout and an operational amplifier OPA. The resistor feedback Rf is connected with the capacitor feedback Cf in parallel to be as a feedback network bridging between a reverse phase input end pin -IN and an output end pin OUT of the operational amplifier OPA, an in-phase input end pin +IN of the optional amplifier OPA is grounded, a P electrode pin of the photodiode PD is connected with bias Vbias-, an N electrode pin of the photodiode PD is connected with the reverse input end pin -IN of the operational amplifier OPA, a G electrode pin of the photodiode PD is grounded, a power supply end pin +VS of the operational amplifier OPA and a power supply end pin -Vs of the operational amplifier OPA are respectively connected with the positive electrode and the negative electrode of a power supply, and the power supply pin and the ground are connected by the decoupling capacitor C+ and the decoupling capacitor C-. The optical receiving module has the benefit of realizing the purposes of large dynamic range and low noise.
Description
Technical field
The utility model relates to a kind of short wave analog photoelectric communication field, particularly a kind of large dynamic range low-noise Optical Receivers that is used for short wave analog optical communication field light-electricity conversion.
Background technology
In analog optical receiver, the performance of Optical Receivers preamplifier, but determined the signal to noise ratio of received signal and the dynamic range of signal.Preamplifier commonly used mainly is the trans-impedance amplifier that utilizes amplifier to build, therefore the trans-impedance amplifier performance depends primarily on three aspects: the building and the coupling of output of the performance parameters of amplifier, feedback network, especially in the broadband application, suppressing noise and improve the emphasis that flatness is a circuit design, also is difficult point.
Summary of the invention
Present situation in view of the prior art existence, the utility model provide a kind of trans-impedance amplifier design with use in improve the scheme of broadband signal amplitude flatness and Signal-to-Noise, and can satisfy large dynamic range low-noise Optical Receivers above the transmission of the great dynamic range radiofrequency signal of 100dB.
The utility model for achieving the above object, the technical scheme of being taked is: a kind of large dynamic range low-noise Optical Receivers, it is characterized in that: comprise photodiode PD, feedback resistance Rf, feedback capacity Cf, decoupling capacitor C+, decoupling capacitor C-, capacitance Cout, operational amplifier OPA, feedback resistance Rf is in parallel with feedback capacity Cf, be connected across as feedback network between the inverting input pin-IN and output pin OUT of operational amplifier OPA, in-phase input end pin+IN ground connection of operational amplifier OPA, the P utmost point pin of photodiode PD meets bias voltage Vbias-, the N utmost point pin of photodiode PD meets operational amplifier OPA reverse input end pin-IN, the G utmost point pin ground connection of photodiode PD, feeder ear pin+the Vs of operational amplifier, feeder ear pin-the Vs of operational amplifier is just connecing power supply respectively, power-, and between power pin and ground with the decoupling capacitor C+, decoupling capacitor C-connects.
The beneficial effects of the utility model are: improve the inband flatness index by the appearance value that changes feedback capacity, and utilize the method for output serial connection capacitance to dispel the noise factor that DC component produced, and suitably increasing feedback resistance, the circuit gain utilization that sacrifices owing to the improvement of these two indexs compensates, thereby reach great dynamic range, low noise purpose.
Description of drawings
Fig. 1 is the utility model circuit theory diagrams and as Figure of abstract.
Fig. 2 is the utility model application examples block diagram.
Fig. 3 is the curve chart of capacitor C f=1PF.
Fig. 4 is the curve chart of capacitor C f=10PF.
Fig. 5 is the curve chart of capacitor C f=20PF.
Fig. 6 is the curve chart of capacitor C f=30PF.
Fig. 7 is the curve chart of capacitor C f=40PF.
Fig. 8 is the curve chart of capacitor C out=0PF.
Fig. 9 is the curve chart of capacitor C out=1PF.
Figure 10 is the curve chart of capacitor C out=10PF.
Figure 11 is the curve chart of capacitor C out=20PF.
Figure 12 is the curve chart of capacitor C out=30PF.
Figure 13 is the curve chart of capacitor C out=40PF.
Embodiment
As shown in Figure 1, the large dynamic range low-noise Optical Receivers, comprise photodiode PD, feedback resistance Rf, feedback capacity Cf, decoupling capacitor C+, decoupling capacitor C-, capacitance Cout, operational amplifier OPA, feedback resistance Rf is in parallel with feedback capacity Cf, be connected across as feedback network between the inverting input pin-IN and output pin OUT of operational amplifier OPA, the in-phase input end pin of operational amplifier OPA+IN ground connection (GND), the P utmost point pin of photodiode PD meets bias voltage Vbias-, the N utmost point pin of photodiode PD meets operational amplifier OPA reverse input end pin-IN, the G utmost point pin ground connection (GND) of photodiode PD, feeder ear pin+the Vs of operational amplifier, feeder ear pin-the Vs of operational amplifier connect respectively power supply just (+5v), power-(5v), and between power pin and ground with the decoupling capacitor C+, decoupling capacitor C-connects.
At first utilize photodiode that light signal is converted to current signal, utilize trans-impedance amplifier to realize the current-voltage conversion then, and signal is amplified, be connected in series capacitance to improve noiseproof feature at the output pin place of trans-impedance amplifier at last.
As shown in Figure 2,1614 light emission module received RF signals, and be transmitted to the receiver module light signal by optical fiber, Optical Receivers is exported to spectrum analyzer with output signal by radio frequency interface.
In trans-impedance amplifier, the input noise electric current is bigger to the influence of circuit noise, therefore need select the less operational amplifier of input noise electric current when selecting amplifier for use for use.The present invention adopts the core devices of the low input noise current operator amplifier of FET input as Optical Receivers.And in design process, make comparisons and test with another operational amplifier.Two amplifier noise parameter is respectively as following table:
| FET imports (VFA) | Non-FET input (VFA) | |
| Input noise electric current (A/ √ Hz) | 1.3E-15 | 2.5E-12 |
| Input noise voltage (V/ √ Hz) | 4.8E-9 | 0.85E-9 |
Test result shows that the trans-impedance amplifier performance that FET input stage amplifier constitutes is significantly better than the latter, and the ground noise level is low.The input current noise that can get amplifier thus is the key factor of decision-making circuit noise objective, should in selection, focus on to consider, in the time of the design trans-impedance amplifier, satisfy under the prerequisite of bandwidth requirement, at first should consider to use the operational amplifier of low input current noise, as core devices.
Resistance and electric capacity have been formed the low pass filter of a low order in the feedback network, draw by emulation and test to circuit, and electric capacity is more little, and it is high more to gain, but treating flatness with leniency can worsen.Accompanying drawing the 3,4,5,6, the 7th, amplitude output signal is with the change trend curve of feedback capacity appearance value.Therefore not only will select the feedback resistance of big resistance when setting up feedback network for use, and feedback capacity selects the electric capacity of Da Rong value slightly for use as far as possible under the prerequisite that guarantees frequency response,, can improve the inband flatness of whole passband though can sacrifice the index that gains.
The trans-impedance amplifier output DC component in analog communication, can be regarded as a kind of noise, and by circuit simulation and test are drawn, noise effect is very big, add coupling capacitance at output and how reduce this The noise, but along with reducing of capacitor's capacity, noise also reduces thereupon, but gain also can reduce, and the appearance value is high more, and it is high more to gain, but noise also can increase, therefore, can be improved circuit performance in the output suitable appearance value coupling capacitance that is coupled.Accompanying drawing the 8,9,10,11,12, the 13rd, output noise and amplitude output signal are with the output capacitance change curve.
The utility model is applied in the short wave analog optical communication field, band limits 8MHz～30MHz.At transimpedance gain is 30dB, input optical power 0dBm, under the situation, can realize-100dBm～+ 17dBm single-frequency point input reference signal.Can realize the undistorted instantaneous dynamic range of 100dB.The circuit additional noise is very little, and the ground noise frequency spectrum increases 3dB in the passband before and after energising.
Claims (1)
1. large dynamic range low-noise Optical Receivers, it is characterized in that: comprise photodiode PD, feedback resistance Rf, feedback capacity Cf, decoupling capacitor C+, decoupling capacitor C-, capacitance Cout, operational amplifier OPA, feedback resistance Rf is in parallel with feedback capacity Cf, be connected across as feedback network between the inverting input pin-IN and output pin OUT of operational amplifier OPA, in-phase input end pin+IN ground connection of operational amplifier OPA, the P utmost point pin of photodiode PD meets bias voltage Vbias-, the N utmost point pin of photodiode PD meets operational amplifier OPA reverse input end pin-IN, the G utmost point pin ground connection of photodiode PD, feeder ear pin+the Vs of operational amplifier, feeder ear pin-the Vs of operational amplifier is just connecing power supply respectively, power-, and between power pin and ground with the decoupling capacitor C+, decoupling capacitor C-connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202513285U CN201584972U (en) | 2009-12-04 | 2009-12-04 | Optical receiving module with large dynamic range and low noise |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202513285U CN201584972U (en) | 2009-12-04 | 2009-12-04 | Optical receiving module with large dynamic range and low noise |
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| CN201584972U true CN201584972U (en) | 2010-09-15 |
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| CN2009202513285U Expired - Fee Related CN201584972U (en) | 2009-12-04 | 2009-12-04 | Optical receiving module with large dynamic range and low noise |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102970076A (en) * | 2012-11-07 | 2013-03-13 | 武汉光迅科技股份有限公司 | Photoelectric detection circuit |
| CN104359455A (en) * | 2014-12-03 | 2015-02-18 | 张石 | Photodiode circuit based on background noise elimination and laser ranging system |
| CN104833515A (en) * | 2015-05-19 | 2015-08-12 | 成都诚邦动力测试仪器有限公司 | Reverse-phase amplification type engine test and control system based on low-order filtering circuit |
| CN108449061A (en) * | 2018-03-12 | 2018-08-24 | 厦门亿芯源半导体科技有限公司 | The optimization method of high bandwidth TIA gain flatness |
| CN108760045A (en) * | 2018-05-25 | 2018-11-06 | 西安工业大学 | A kind of photodetection circuit of Larger Dynamic range |
| CN110441592A (en) * | 2019-09-17 | 2019-11-12 | 贵州电网有限责任公司 | A kind of the sampling early warning system and method for GIS electronic mutual inductor acquisition unit |
| WO2020253809A1 (en) * | 2019-06-21 | 2020-12-24 | 华为技术有限公司 | Optical receiving assembly, optical transceiving assembly, optical module, and optical network device |
| CN115811283A (en) * | 2022-11-25 | 2023-03-17 | 厦门优迅高速芯片有限公司 | Anti-wifi signal interference circuit of trans-impedance amplifier |
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2009
- 2009-12-04 CN CN2009202513285U patent/CN201584972U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102970076A (en) * | 2012-11-07 | 2013-03-13 | 武汉光迅科技股份有限公司 | Photoelectric detection circuit |
| CN102970076B (en) * | 2012-11-07 | 2015-09-09 | 武汉光迅科技股份有限公司 | A kind of photoelectric detective circuit |
| CN104359455A (en) * | 2014-12-03 | 2015-02-18 | 张石 | Photodiode circuit based on background noise elimination and laser ranging system |
| CN104359455B (en) * | 2014-12-03 | 2016-09-07 | 张石 | The photodiode circuit eliminated based on ambient noise and LDMS |
| CN104833515A (en) * | 2015-05-19 | 2015-08-12 | 成都诚邦动力测试仪器有限公司 | Reverse-phase amplification type engine test and control system based on low-order filtering circuit |
| CN108449061A (en) * | 2018-03-12 | 2018-08-24 | 厦门亿芯源半导体科技有限公司 | The optimization method of high bandwidth TIA gain flatness |
| CN108760045A (en) * | 2018-05-25 | 2018-11-06 | 西安工业大学 | A kind of photodetection circuit of Larger Dynamic range |
| CN108760045B (en) * | 2018-05-25 | 2023-12-15 | 西安工业大学 | Photoelectric detection circuit with large dynamic range |
| WO2020253809A1 (en) * | 2019-06-21 | 2020-12-24 | 华为技术有限公司 | Optical receiving assembly, optical transceiving assembly, optical module, and optical network device |
| EP3975451A4 (en) * | 2019-06-21 | 2022-08-10 | Huawei Technologies Co., Ltd. | Optical receiving assembly, optical transceiving assembly, optical module, and optical network device |
| US11848710B2 (en) | 2019-06-21 | 2023-12-19 | Huawei Technologies Co., Ltd. | Receiver optical sub-assembly, bi-directional optical sub-assembly, optical module, and optical network device |
| CN110441592A (en) * | 2019-09-17 | 2019-11-12 | 贵州电网有限责任公司 | A kind of the sampling early warning system and method for GIS electronic mutual inductor acquisition unit |
| CN110441592B (en) * | 2019-09-17 | 2024-05-07 | 贵州电网有限责任公司 | Sampling early warning system and method of electronic transformer acquisition unit for GIS |
| CN115811283A (en) * | 2022-11-25 | 2023-03-17 | 厦门优迅高速芯片有限公司 | Anti-wifi signal interference circuit of trans-impedance amplifier |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20131204 |