CN101852851A - Gain-variable trans-impedance amplifier integrated circuit for pulse laser range finder echo receiver - Google Patents
Gain-variable trans-impedance amplifier integrated circuit for pulse laser range finder echo receiver Download PDFInfo
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- CN101852851A CN101852851A CN 201010139044 CN201010139044A CN101852851A CN 101852851 A CN101852851 A CN 101852851A CN 201010139044 CN201010139044 CN 201010139044 CN 201010139044 A CN201010139044 A CN 201010139044A CN 101852851 A CN101852851 A CN 101852851A
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Abstract
The invention discloses a gain-variable trans-impedance amplifier integrated circuit for a pulse laser range finder echo receiver, belonging to the technical field of integrated circuit design. The integrated circuit is based on the CMOS integration technology, a narrow pulse photo signal generated by a photoelectric detector is converted into a voltage signal via a current buffer and a difference trans-impedance amplifier, the voltage signal is attenuated by an R-2R resistance attenuating network according to a given attenuation times input by digital control, is amplified to a certain amplitude by a broadband voltage amplifier and is in buffer output by an output buffer. The invention has the advantages of realizing single chip integration for a multi-functional module circuit in the existing pulse laser range finder, improving the integrated level of a receiving circuit, lowering batch production cost for the system and being favor of realizing the multi-element laser echo detection at a high integration level.
Description
Technical field
The present invention relates to the integrated circuit (IC) design technology, specifically refer to a kind of gain-variable trans-impedance amplifier integrated circuit that pulse laser range finder echo receives that is used for, the echo burst pulse photo-signal that it is used for paired pulses formula laser range finder transforms and amplifies.
Background technology
Compare with other non-contact distance-measurement modes, that pulse type laser range finding has is simple in structure, need not advantages such as target cooperation, ranging is far away, measuring speed is fast, makes it all obtain using widely at space flight, military affairs and industrial circle.Pulse laser laser welder is received by the range finder echo receiving cable behind target reflection to light pulse of target emission, the measuring light pulse from be transmitted into return that laser ranging stadimeter institute elapsed time can obtain and target between distance.Pulsed laser ranging can also be realized the laser three-dimensional imaging of target in conjunction with two-dimensional scan or focal plane detection technology.The echo receiving cable generally by photodetector and stride the resistance amplifying circuit form.Stride the resistance amplifying circuit and be used for faint short duration current signal conversion that photodetector is exported and the voltage pulse signal that is enlarged into certain amplitude.Because stride the single distance accuracy that the signal to noise ratio (S/N ratio) of resistance amplifying circuit output pulse signal and rise time directly have influence on pulse laser laser welder, its gain, bandwidth and noiseproof feature have crucial influence to whole range-finding system performance.
The existing a plurality of chips of the many employings of gain-variable trans-impedance amplifying circuit that are used for the pulse laser range finder echo reception are realized its function.In this case, the requirement of high precision, high sensitivity and great dynamic range often causes the power consumption of circuit and volume excessive, is unfavorable for the lightweight of laser ranging instrument system, miniaturization and batch process.The external interconnect of chip makes circuit more be subject to electromagnetic interference simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of monolithic gain variable trans-impedance amplifier that pulse laser range finder echo receives that can be used for, solve the technical deficiency that exists in the existing method for designing based on the CMOS integrated circuit technique.
Purpose of the present invention is realized by following technological approaches:
Adopt the CMOS integrated circuit technique, as Fig. 1, circuit module comprises current buffering input stage, difference trans-impedance amplifier, R-2R resistance decrement network, broadband voltage amplifier and output buffer, wherein:
1) the current buffering input stage is as the first order of circuit input, basic circuit synoptic diagram such as Fig. 2.Adopt RGC circuit (Regulated Cascode Circuit), realize input Low ESR and output high impedance, effectively isolated the input impedance of circuit input capacitance (comprising photodetector stray capacitance and interconnection line stray capacitance) and difference trans-impedance amplifier, reduced of the influence of bigger circuit input capacitance circuit bandwidth.
2) the difference trans-impedance amplifier adopts differential amplifier to add the feedback resistance configuration, and input current signal is converted into voltage signal.
3) R-2R resistance decrement network is realized circuit diagram such as Fig. 2.Wherein resistance adopts the NMOS pipe to realize, the bias level that the passive resistance attenuation network brings in the time of can overcoming inter-stage and directly be coupled changes.Bias level V
bFlat consistent with the prime output DC.Adopt 3 binary code digital control approaches, 3 binary codes are converted to 8 only sign indicating numbers of heat, corresponding node output realized for 7 steps, the change in gain of every stepping 6-dB in the selected resistance decrement network.
4) the broadband voltage amplifier adopts the cascade of a plurality of mutual conductances-stride resistance voltage amplifier to constitute.Mutual conductance-trans-impedance amplifier, as Fig. 4, inside is made of two-stage, and the first order is a transconductance stage, and for input voltage signal provides mutual conductance, the second level is for striding the resistance level, and its feedback resistance provides equivalent load for the mutual conductance electric current of the first order.Adopt the sort circuit configuration to obtain bigger voltage gain by increasing feedback resistance.Simultaneously since each limit of circuit not with the feedback resistance direct correlation, thereby can realize broadband application.Adopt the cascade of a plurality of mutual conductances-stride resistance voltage amplifier, enough back step voltage gains can be provided under the prerequisite that guarantees certain bandwidth.
5) output buffer adopts source follower, realizes little output impedance, and enough driving forces are provided, so that the outer resistive load of driving chip.
Working method of the present invention is: photodetector is capacitively coupled to chip input pin, after the burst pulse photo-signal of its generation changes into voltage signal by current buffering input stage and difference trans-impedance amplifier, after 3 scale-of-two control codes that R-2R resistance decrement network provides by control circuit are carried out the decay of corresponding multiple, be amplified to certain amplitude and cushion output through output buffer by the broadband voltage amplifier.
The present invention contrasts prior art and has advantage:
1) adopt the CMOS integrated technology, what single-chip had been realized gain-variable strides the resistance amplifying circuit, can reduce the power consumption and the volume of circuit, helps the lightweight of laser ranging instrument system, miniaturization and batch process.Help the realization of the many element laser sounding of high integration simultaneously.
2) reduced electromagnetic interference by the external interconnect coupling of chip.
3) trans-impedance amplifier gain realization is digital control, and its scale-of-two control code can be produced by the laser range finder digital control circuit very easily, simplify the gain control circuit of system.
Description of drawings
Fig. 1 is a basic structure synoptic diagram of the present invention, by current buffering input stage, difference trans-impedance amplifier, R-2R resistance decrement network, broadband voltage amplifier and output buffer totally five the part form.
Fig. 2 is the basic circuit synoptic diagram of current buffering input stage of the present invention, adopts RGC circuit (Regulated Cascode Circuit).
Fig. 3 is that R-2R resistance decrement network is realized circuit diagram.
The circuit diagram of mutual conductance-trans-impedance amplifier of using in the voltage amplifier of Fig. 4 broadband.Wherein NMOS manages M
1, M
2, I
S1With pull-up resistor R
D1The first order of forming circuit, i.e. transconductance stage.NMOS manages M
3, M4, I
S2, pull-up resistor R
D2With feedback resistance R
fThe resistance level is promptly striden in the second level of forming circuit.
Embodiment
Embodiment
Adopt 0.6-μ m mixed signal CMOS technology, design has the gain-variable trans-impedance amplifier integrated circuit of following input and output requirement: input pulse photocurrent amplitude range is 0.1 μ A-10 μ A, rise time is 4ns, the circuit input capacitance is about 5pF, and desired voltage pulse output amplitude range is about 1-2V.
For realizing higher distance accuracy, stride the resistance amplifying circuit and should keep short as far as possible pulse signal rising edge.According to signal theory, keep the minimum bandwidth that needs of 4ns rise time to be about 110MHz.Simultaneously, according to the input/output signal amplitude, the maximum gain that trans-impedance amplifier need provide is minimum to be 120dB Ω, and gain control dynamic range minimum is 40dB.
Specific embodiments is as follows:
1) the current buffering input stage adopts the RGC circuit, adjusts each metal-oxide-semiconductor parameter and makes input impedance be about 100 Ω, and the limit that constitutes with the 5pF input capacitance can not exert an influence to the circuit overall bandwidth beyond 300MHz.Output impedance is 20k Ω, directly is coupled with the difference trans-impedance amplifier that hangs down input impedance, has guaranteed very little level loss.
2) the difference trans-impedance amplifier adopts differential amplifier to add the feedback resistance configuration, and input current signal is converted into voltage signal.Feedback resistance adopts the NMOS tube resistor, can realize higher transimpedance gain.Have the source with output stage, output impedance 490 Ω (single-ended) can be directly and R-2R resistance decrement network coupled and do not have too big gain loss and bandwidth lose.Current buffering input stage and the cascade of difference trans-impedance amplifier can realize 85dB Ω gain (difference) and 170MHz bandwidth.
3) resistance in the R-2R resistance decrement network is realized by the NMOS pipe, is biased by bias voltage in the sheet, sets R and is about 1k Ω.Switching tube adopts minimum dimension NMOS pipe for reducing ghost effect.Input scale-of-two control word is 3, transfers 8 only sign indicating numbers of heat to by the 3-8 code translator, thereby realizes the stepping decay control of 42dB altogether.For not influencing the circuit overall bandwidth, R-2R resistance decrement network is exported by buffer buffers, to guarantee the integrated circuit bandwidth performance.
4) mutual conductance in the voltage amplifier of broadband-trans-impedance amplifier is realized 24dB (difference) voltage gain, and about 230MHz bandwidth adopts 2 grades of cascades, realizes full gain and the 160MHz bandwidth of 48dB.
5) output buffer adopts the source with circuit, realizes 100 Ω output impedance, the directly outer load of driving chip.The whole resistance amplification circuit of striding is realized 131dB Ω maximum gain, 7 steppings, 42dB gain dynamic range, and 120MHz bandwidth altogether.
Claims (4)
1. one kind is used for the gain-variable trans-impedance amplifier integrated circuit that pulse laser range finder echo receives, comprise following functional module: the current buffering input stage, the difference trans-impedance amplifier, R-2R resistance decrement network, broadband voltage amplifier and output buffer, it is characterized in that: add the current buffering input stage between photodetector and the difference trans-impedance amplifier, after the burst pulse photo-signal that photodetector produced changes into voltage signal by the difference trans-impedance amplifier, after R-2R resistance decrement network is decayed by the given attenuation multiple of digital control input, be amplified to certain amplitude and cushion output through output buffer by the broadband voltage amplifier.
2. a kind of gain-variable trans-impedance amplifier integrated circuit that pulse laser range finder echo receives that is used for according to claim 1, it is characterized in that: described current buffering input stage adopts the RGC circuit, realize input Low ESR and output high impedance, effectively isolated the input impedance of circuit input capacitance and difference trans-impedance amplifier, reduced of the influence of circuit input capacitance circuit bandwidth.
3. a kind of gain-variable trans-impedance amplifier integrated circuit that is used for the pulse laser range finder echo receiving circuit according to claim 1, it is characterized in that: described R-2R resistance decrement network is made up of NMOS pipe array, realization is by 7 steppings of 3 binary code controls, the change in gain level of every stepping 6-dB.
4. a kind of gain-variable trans-impedance amplifier integrated circuit that pulse laser range finder echo receives that is used for according to claim 1, it is characterized in that: described broadband voltage amplifier is made of multistage mutual conductance-trans-impedance amplifier cascade, realizes enough voltage gain and bandwidth.
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| CN2010101390444A CN101852851B (en) | 2010-04-02 | 2010-04-02 | Gain-variable trans-impedance amplifier integrated circuit for pulse laser range finder echo receiver |
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| CN2010101390444A CN101852851B (en) | 2010-04-02 | 2010-04-02 | Gain-variable trans-impedance amplifier integrated circuit for pulse laser range finder echo receiver |
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| CN101852851B CN101852851B (en) | 2012-06-27 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102394609A (en) * | 2011-10-25 | 2012-03-28 | 中国兵器工业集团第二一四研究所苏州研发中心 | Spike pulse voltage amplifier |
| CN102638231A (en) * | 2012-03-19 | 2012-08-15 | 中国科学院上海技术物理研究所 | Method for designing fully-customized chip for detection of high-speed weak photoelectric signals |
| CN106019292A (en) * | 2016-05-12 | 2016-10-12 | 常州大地测绘科技有限公司 | Laser receiving circuit for phase-based laser rangefinders |
| CN107317637A (en) * | 2016-04-26 | 2017-11-03 | 苏州旭创科技有限公司 | Light-receiving component and optical module |
| CN107810600A (en) * | 2015-04-03 | 2018-03-16 | 科塞密科技公司 | Balanced differential trans-impedance amplifier and balance method with single ended input |
| CN107817484A (en) * | 2016-09-12 | 2018-03-20 | 北京万集科技股份有限公司 | The multiplication factor processing method and processing device of laser radar amplifying circuit |
| CN109471013A (en) * | 2018-10-30 | 2019-03-15 | 北京航空航天大学 | For the pulse testing method of the bandwidth of HCNR200 linear optical coupling isolation circuit |
| CN110988845A (en) * | 2019-10-25 | 2020-04-10 | 西安电子科技大学 | Laser echo signal conditioning circuit |
| CN111352088A (en) * | 2018-12-21 | 2020-06-30 | 余姚舜宇智能光学技术有限公司 | Doppler echo signal processing method for laser Doppler vibration meter and circuit system thereof |
| CN114236494A (en) * | 2021-11-30 | 2022-03-25 | 桂林理工大学 | Single-frequency laser radar bathymetric survey echo signal optimization system |
| CN117155297A (en) * | 2023-11-01 | 2023-12-01 | 深圳市万和科技股份有限公司 | Numerical control variable gain amplifier chip applied to FTTH optical receiver |
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| US9354051B2 (en) | 2012-09-13 | 2016-05-31 | Laser Technology, Inc. | System and method for a rangefinding instrument incorporating pulse and continuous wave signal generating and processing techniques for increased distance measurement accuracy |
| US9879995B2 (en) | 2012-09-13 | 2018-01-30 | Laser Technology, Inc. | System and method for superimposing a virtual aiming mechanism with a projected system beam in a compact laser-based rangefinding instrument |
| US9897690B2 (en) | 2014-10-27 | 2018-02-20 | Laser Technology, Inc. | Technique for a pulse/phase based laser rangefinder utilizing a single photodiode in conjunction with separate pulse and phase receiver circuits |
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| CN102394609B (en) * | 2011-10-25 | 2014-06-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Spike pulse voltage amplifier |
| CN102394609A (en) * | 2011-10-25 | 2012-03-28 | 中国兵器工业集团第二一四研究所苏州研发中心 | Spike pulse voltage amplifier |
| CN102638231A (en) * | 2012-03-19 | 2012-08-15 | 中国科学院上海技术物理研究所 | Method for designing fully-customized chip for detection of high-speed weak photoelectric signals |
| CN107810600A (en) * | 2015-04-03 | 2018-03-16 | 科塞密科技公司 | Balanced differential trans-impedance amplifier and balance method with single ended input |
| CN107317637B (en) * | 2016-04-26 | 2020-10-27 | 苏州旭创科技有限公司 | Light receiving module and optical module |
| CN107317637A (en) * | 2016-04-26 | 2017-11-03 | 苏州旭创科技有限公司 | Light-receiving component and optical module |
| CN106019292A (en) * | 2016-05-12 | 2016-10-12 | 常州大地测绘科技有限公司 | Laser receiving circuit for phase-based laser rangefinders |
| CN106019292B (en) * | 2016-05-12 | 2018-04-20 | 常州大地测绘科技有限公司 | Phase laser distance measurement instrument laser pick-off circuit |
| CN107817484A (en) * | 2016-09-12 | 2018-03-20 | 北京万集科技股份有限公司 | The multiplication factor processing method and processing device of laser radar amplifying circuit |
| CN109471013A (en) * | 2018-10-30 | 2019-03-15 | 北京航空航天大学 | For the pulse testing method of the bandwidth of HCNR200 linear optical coupling isolation circuit |
| CN111352088A (en) * | 2018-12-21 | 2020-06-30 | 余姚舜宇智能光学技术有限公司 | Doppler echo signal processing method for laser Doppler vibration meter and circuit system thereof |
| CN110988845A (en) * | 2019-10-25 | 2020-04-10 | 西安电子科技大学 | Laser echo signal conditioning circuit |
| CN114236494A (en) * | 2021-11-30 | 2022-03-25 | 桂林理工大学 | Single-frequency laser radar bathymetric survey echo signal optimization system |
| CN117155297A (en) * | 2023-11-01 | 2023-12-01 | 深圳市万和科技股份有限公司 | Numerical control variable gain amplifier chip applied to FTTH optical receiver |
| CN117155297B (en) * | 2023-11-01 | 2024-02-13 | 深圳市万和科技股份有限公司 | Numerical control variable gain amplifier chip applied to FTTH optical receiver |
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