CN104748858B - A kind of InGaAs short-wave infrareds detector signal processing system - Google Patents
A kind of InGaAs short-wave infrareds detector signal processing system Download PDFInfo
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Abstract
The invention discloses a kind of InGaAs short-wave infrareds detector signal processing system, including InGaAs short-wave infrareds detector, signal input part, the single-ended change-over circuit of difference, signal condition filter circuit, analog to digital conversion circuit, data processing circuit.The system realizes that the impedance matching, amplification, master backup interface of signal are supported by the single-ended change-over circuit of difference, signal is again by the processing of signal condition filter circuit, the data of digital form are exported into analog to digital conversion circuit, and by the final incoming data process circuit of data.There is circuit to introduce the features such as noise is low, input supports system master backup, strong antijamming capability compared with traditional InGaAs short-wave infrareds detector signal processing system.
Description
Technical field
The present invention relates to a kind of signal processing system, particularly a kind of InGaAs short-wave infrareds detector signal processing system
System, belongs to field of signal processing.
Background technology
InGaAs short-wave infrared detectors are a kind of linear array non-refrigerated infrared detectors emerging in recent years, compared to traditional
Refrigeration mode infrared device, in the case where possessing similar performance, have concurrently small volume, cost it is low, it is low in energy consumption the features such as, be particularly suitable for
Apply in military surveillance and space remote sensing field.The output signal of InGaAs short-wave infrared detectors has following features：1) it is defeated
Go out internal resistance big, usually require that less load capacitance and larger load resistance；2) higher circuit noise index request；3) one
As use the difference analogue way of output；4) each pixel signal keeps a fixed level value after foundation.For above-mentioned letter
How number output characteristic, design a set of signal processing system that disclosure satisfy that requirement and reach preferable imaging for imaging circuit
Effect is very crucial.
Traditional InGaAs short-wave infrared detector signal processing systems, generally use penetrate level and follow circuit to each passage
Signal realize impedance matching respectively, then the analog difference signal of output is directly being put by differential operational amplifier
Big and filtering, finally sends into analog-digital converter and carries out analog-to-digital conversion.This processing mode has some following weak point：1) use
Penetrating level follows circuit that two passages are carried out with impedance matching respectively, can be due to the parameter differences of two channel circuits, particularly computing
The parameter differences of amplifier cause differential signal unbalance, equivalent to introducing differential mode noise；2) side of circuit is followed using design
Formula, two passages influence larger because device drifts about on DC level signal, and the view data of imaging system can be caused unstable；3)
The amplifying element to analog signal can only be placed in the rear class of analog signal channel by the way of design follows circuit, be unfavorable for
Suppression to whole system circuit noise；4) two passages penetrate level using two panels operational amplifier composition and follow circuit, compared to
Monolithic device can increase extra power consumption, at the same also can increasing circuit take area；5) traditional design does not all account for mould
Intend the support issue of signal master backup interface, this undoubtedly limits systematic difference scope, is unfavorable for the lifting of system reliability.
The content of the invention
The technology of the present invention solves problem：The deficiencies in the prior art are overcome to be visited there is provided a kind of InGaAs short-wave infrareds
Device signal processing system is surveyed, solves that two channel signals present in traditional homogeneous system are unbalance, signal amplifying element is located at letter
The problem of number passage rear class introduces extra circuit noise and legacy system does not support the active and standby interface of input.
The present invention technical solution be：A kind of InGaAs short-wave infrareds detector signal processing system, including：
InGaAs short-wave infrareds detector, signal input part, the single-ended change-over circuit of difference, signal condition filter circuit, analog-to-digital conversion electricity
Road, data processing circuit；Wherein InGaAs short-wave infrareds detector, is responsible for the optical signal detected being converted to differential electric signal
Deliver to signal input part；Signal input part includes the first source side resistance R1 and the second source side resistance R2；
Signal input part, by differential electric signal through the first source side resistance R1 and the second source side resistance R2 matching after, output with
The differential electric signal of difference single-ended change-over circuit matching, as the input of the single-ended change-over circuit of difference, the first source side resistance R1 and
Second source side resistance R2 one end is respectively connected to InGaAs short-wave infrared detector signal output ends, the first source side resistance R1 and
The two source side resistance R2 other end as the single-ended change-over circuit of difference input；
The single-ended change-over circuit of difference, is converted to single-ended signal by the differential signal of input and delivers to signal condition filter circuit,
And impedance matching is realized to the differential signal of input, the differential signal of input is amplified, while the single-ended change-over circuit of difference
Also serve as the interface of system master backup；
Signal condition filter circuit, is filtered and nurses one's health to the single-ended signal that the single-ended change-over circuit of difference is sent, obtain
Analog difference signal in analog to digital conversion circuit input dynamic range, delivers to analog to digital conversion circuit；
Analog to digital conversion circuit, the analog difference signal that signal condition filter circuit is sent is converted to parallel numeral letter
Number, deliver to data processing circuit；
Data processing circuit, digital filtering is realized to the data signal that analog to digital conversion circuit is sent and then carries out and go here and there to turn
Change, obtain corresponding serial data, and the data are packaged into required data format.
The advantage of the present invention compared with prior art is：
(1) present invention is amplified in the single-ended change-over circuit of difference using the difference single end operational for possessing power-off zero output characteristic
Device, it would be preferable to support input signal master backup interface.
(2) amplifying element of analog signal is placed in the single-ended change-over circuit of system prime, i.e. difference by the present invention, Ke Yiyou
The amplification for avoiding introducing late-class circuit noise of effect.
(3) impedance matching circuit that difference single end operational amplifier used is constituted in the single-ended change-over circuit of difference of the present invention compared with
Level of penetrating follow circuit to possess more preferable circuit symmetrical characteristic.
(4) each several part circuit that the present invention is used has less element, smaller area occupied and smaller power consumption.
Brief description of the drawings
Fig. 1 is the schematic diagram of signal processing system of the present invention；
Fig. 2 is the single-ended change-over circuit schematic diagram of difference of the present invention；
Fig. 3 is signal condition filter circuit schematic diagram of the present invention；
The imaging circuit signal to noise ratio measured drawing that Fig. 4 is realized for the present invention.
Embodiment
The present invention thinking be：According to the characteristics of InGaAs short-wave infrared detector output signals, pass through difference list first
The differential signal that detector is exported is converted to single-ended signal and signal is amplified by end change-over circuit, and then signal is carried out
Conditioning filters and completes analog-to-digital conversion, and the data after most changing at last carry out digital filtering, parallel-serial conversion, needed for being packaged into afterwards
Data format；Simultaneously according to the power-off zero output feature of selected difference single end operational amplifier, realize active and standby to input signal
The support of part interface.
The present invention is described in detail below in conjunction with the accompanying drawings.
As shown in figure 1, be a kind of schematic diagram of InGaAs short-wave infrareds detector signal processing system of the invention, including
InGaAs short-wave infrareds detector, signal input part, the single-ended change-over circuit of difference, signal condition filter circuit, analog-to-digital conversion electricity
Road, data processing circuit, wherein data processing circuit are realized using PLD.InGaAs short-wave infrareds detector will
The optical signal detected is converted to differential electric signal and delivers to signal input part；Signal input part includes the first source side resistance R1 and the
Two source side resistance R2；
Signal input part, by differential electric signal through the first source side resistance R1 and the second source side resistance R2 matching after, output with
The differential electric signal of difference single-ended change-over circuit matching, as the input of the single-ended change-over circuit of difference, the first source side resistance R1 and
Second source side resistance R2 one end is respectively connected to InGaAs short-wave infrared detector signal output ends, the first source side resistance R1 and
The two source side resistance R2 other end as the single-ended change-over circuit of difference input；
The single-ended change-over circuit of difference, is converted to single-ended signal by the differential signal of input and delivers to signal condition filter circuit,
And impedance matching is realized to the differential signal of input, the differential signal of input is amplified, while the single-ended change-over circuit of difference
Also serve as the interface of system master backup；
Signal condition filter circuit, is filtered and nurses one's health to the single-ended signal that the single-ended change-over circuit of difference is sent, obtain
Analog difference signal in analog to digital conversion circuit input dynamic range, delivers to analog to digital conversion circuit；
Analog to digital conversion circuit, the analog difference signal that signal condition filter circuit is sent is converted to parallel numeral letter
Number, deliver to data processing circuit；
Data processing circuit, digital filtering is realized to the data signal that analog to digital conversion circuit is sent and then carries out and go here and there to turn
Change, obtain corresponding serial data, and the data are packaged into required data format.
As shown in figure 1, the first source side resistance R1, the second source side resistance R2 are with the single-ended fortune of difference in the single-ended change-over circuit of difference
The equivalent input capacitance for calculating amplifier 221 constitutes low-pass filter circuit, the first source side resistance R1, the second source side resistance R2 two ends
It is respectively connected to the output end of InGaAs short-wave infrared detectors and input Vi+, Vi- of difference single end operational amplifier 221.The
One source side resistance R1, the selection of the second source side resistance R2 resistance need to meet claimed below：1) signal symmetry of differential signal will
Ask, i.e. R1=R2；2) source matching is required, typically chooses R1=R2<50Ω.First source side resistance R1 and the second source side resistance R2
Source build-out resistor mainly as input interface is used, it is therefore an objective to prevent the signal reflex of circuit.
The single-ended change-over circuit of difference mainly realizes the impedance matching of differential electric signal, the amplification of differential electric signal and system
Master backup interface supports function, and its schematic diagram is as shown in Fig. 2 including first resistor R3, second resistance R4,3rd resistor R5 and difference
Divide single end operational amplifier 211, it is defeated that difference single end operational amplifier 221 includes differential input end 1+, differential input end 1-, difference
Enter to hold 2+, differential input end 2-, output end Vs and equivalent input capacitance, differential input end 1+, differential input end 1- connect respectively
The first source side resistance R1 and the second source side resistance R2 one end are connect, while the one of the first source side resistance R1 and the second source side resistance R2
End is also connected with the equivalent input capacitance of difference single end operational amplifier 221.The ends of first resistor R3 mono- are connected to difference single end operational
The input 2+ of amplifier 221, it is another with being connected to circuit, the ends of second resistance R4 mono- are connected to difference single end operational amplifier 221
Input 2-, it is another with being connected to circuit, the ends of 3rd resistor R5 mono- are connected to the input of difference single end operational amplifier 221
2-, the other end is connected with the output end Vs of difference single end operational amplifier 221.The single-ended change-over circuit of difference changes differential signal
For single-ended signal, primarily to removing common mode DC level contained in differential electric signal, the single-ended change-over circuit of difference will
Signal amplifying element is placed in system foremost, is in order to avoid the circuit noise of rear class is amplified, while taking into account impedance matching
Function, difference single end operational amplifier 211 is that input impedance is more than 750k Ω, input capacitance and is less than 15pF and possesses power-off zero
The device of output characteristics, wherein high input impedance, low input capacitance characteristic are to meet same InGaAs short-wave infrareds detector
The matching of output difference electric signal, and it is then in order to realize the support to master backup interface, to ensure electricity to power off zero output characteristic
Road is balanced, and first resistor R3, second resistance R4,3rd resistor R5 value should meet R3=R4//R5；The single-ended conversion electricity of difference
The circuit gain on road is
Signal condition filter circuit, including single-ended transfer difference circuit and low-pass filter circuit two parts, schematic diagram such as Fig. 3 institutes
Show, single-ended transfer difference circuit includes differential operational amplifier 231, the 4th resistance R6, the 5th resistance R7, the 6th resistance R8, the 7th
Resistance R9；Low-pass filter circuit includes the 8th resistance R10, the 9th resistance R11 and electric capacity C1；Differential operational amplifier 231 includes
In-phase input end, inverting input, output end in the same direction, reversed-phase output, common mode input VVCM；A 4th resistance R6 termination
To the output end V of difference single end operational amplifier 221s, the another of the 4th resistance R6 be connected to the same of differential operational amplifier 231
Phase input, a 5th resistance R7 termination circuit, the another of the 5th resistance R7 is connected to the anti-of differential operational amplifier 231
Phase input, the 6th resistance R8 two ends are respectively connected to the in-phase input end and reversed-phase output of differential operational amplifier 231, the
Seven resistance R9 two ends are respectively connected to the inverting input and in-phase output end of differential operational amplifier 231；Calculus of differences amplifies
The common mode input V of device 231VCMIt is connected with analog to digital conversion circuit；8th resistance R10 one end is connected to differential operational amplifier 231
Reversed-phase output, on the one hand the other end be used as the inverting input of analog to digital conversion circuit, on the other hand the one of connection electric capacity C1
End, the 9th resistance R11 one end is connected to the in-phase output end of differential operational amplifier 231, and on the one hand the other end turns as modulus
The in-phase input end of circuit is changed, on the other hand the connection electric capacity C1 other end；Due to wanting for single-ended transfer difference circuit balancing characteristic
Ask, the 4th resistance R6, the 5th resistance R7, the 6th resistance R8, the 7th resistance R9 resistance should meet R6=R7=R8=R9=510
The 8th resistance R10, the 9th resistance R11 in Ω, same low-pass filter circuit should also meet the requirement of difference channel equilibrium response,
That is R10=R11.Low-pass filter circuit can play the high-frequency noise that a part is filtered out before signal enters analog to digital conversion circuit,
But in order to ensure that the differential electric signal signal of detector output will not lose effective information, the cut-off frequency f of wave filterpIt should be greater than
The output pixel clock frequency f of InGaAs short-wave infrared detectorss5 times, i.e.,Signal condition
Single-ended signal is converted to differential signal by filter circuit, primarily to the interface requirement with rear class analog to digital conversion circuit is met,
Noise jamming is filtered out as far as possible before signal carries out analog-to-digital conversion simultaneously.
The analog difference signal of signal condition filter circuit output, by the high-resolution (N=of analog to digital conversion circuit
14bit), (80MSPS) difference A/D converter carries out analog-to-digital conversion at a high speed, and analog to digital conversion circuit is defeated by parallel data afterwards
Go out to data processing circuit, the parallel data signal of the simulation that data processing circuit sends analog to digital conversion circuit carries out digital filter
Data after processing, are packaged into required data format by ripple, parallel-serial conversion afterwards.
For example：InGaAs short-wave infrared detector pixels speed is 10Mhz, and some pixel analog signal of output is Vi+
=1.7V, Vi-=1.3V, if setting gain G=5 of the single-ended change-over circuit of difference, the single-ended change-over circuit of difference is output as Vs
=2V, signal condition filter circuit Vvcm=1V, then signal condition filter circuit output V+=2V, V-=0V, if analog-to-digital conversion
The dynamic range of circuit is -2.5V~+2.5V, then the data signal that correspondence quantifies after changing is repeatable per pixel to adopt into 6554
Sample 8 times, is carried out after digital filtering, one 14bits data of correspondence is reverted to per pixel, then by parallel-serial conversion and be packaged into institute
The data format needed, the data of above-mentioned pixel just can be transferred to corresponding terminal and carry out display and further analysis.
The InGaAs short-wave infrared detector signal processing systems designed according to the present invention, are full in detector output signal
In the case of range 80%, actual system signal noise ratio test result is as shown in Figure 4.Fig. 4 ordinates are signal to noise ratio, and abscissa is
Pixel position, solid line is system signal noise ratio measured result, and dotted line is the theoretical signal to noise ratio of analog-digital converter, and the numerical value, which does not include, is
Unite the influence of other circuit noises, namely Systems Theory signal to noise ratio maximum.As shown in Figure 4, designed based on the present invention
The actual measurement signal to noise ratio of InGaAs short-wave infrared detector signals processing system major part pixel is up to 70dB, close to analog-to-digital conversion
The signal-to-noise theory value 74dB of device.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (10)
1. a kind of InGaAs short-wave infrareds detector signal processing system, it is characterised in that including：InGaAs short-wave infrareds are detected
The single-ended change-over circuit of device, signal input part, difference, signal condition filter circuit, analog to digital conversion circuit, data processing circuit；Its
Middle InGaAs short-wave infrareds detector, is responsible for the optical signal detected is converted into differential electric signal delivering to signal input part；Letter
Number input includes the first source side resistance R1 and the second source side resistance R2；
Signal input part, by differential electric signal after the first source side resistance R1 and the second source side resistance R2 matchings, output and difference
The differential electric signal of single-ended change-over circuit matching, is used as the input of the single-ended change-over circuit of difference, the first source side resistance R1 and second
Source side resistance R2 one end is respectively connected to InGaAs short-wave infrared detector signal output ends, the first source side resistance R1 and the second source
The resistance R2 other end is held as the input of the single-ended change-over circuit of difference；
The single-ended change-over circuit of difference, is converted to single-ended signal by the differential electric signal of input and delivers to signal condition filter circuit, and
Differential electric signal to input realizes impedance matching, and the differential electric signal of input is amplified, while the single-ended conversion electricity of difference
Road also serves as the interface of system master backup；
Signal condition filter circuit, is filtered and nurses one's health to the single-ended signal that the single-ended change-over circuit of difference is sent, obtain modulus
Analog differential electric signal in change-over circuit input dynamic range, delivers to analog to digital conversion circuit；
Analog to digital conversion circuit, parallel data signal is converted to by the analog differential electric signal that signal condition filter circuit is sent,
Deliver to data processing circuit；
Data processing circuit, digital filtering is realized to the data signal that analog to digital conversion circuit is sent and then parallel-serial conversion is carried out, obtained
To corresponding serial data, and the data are packaged into required data format.
2. a kind of InGaAs short-wave infrareds detector signal processing system according to claim 1, it is characterised in that：It is described
The single-ended change-over circuit of difference include：First resistor R3, second resistance R4,3rd resistor R5 and difference single end operational amplifier
(221), difference single end operational amplifier (221) includes differential input end 1+, differential input end 1-, differential input end 2+, difference
Input 2-, output end Vs and equivalent input capacitance, differential input end 1+, differential input end 1- connect the first source electricity respectively
R1 and the second source side resistance R2 one end is hindered, while the first source side resistance R1 and the second source side resistance R2 one end are also with difference list
The equivalent input capacitance of operational amplifier (221) is held to be connected；
The ends of first resistor R3 mono- are connected to the input 2+ of difference single end operational amplifier (221), it is another with being connected to circuit, second
The ends of resistance R4 mono- are connected to the input 2- of difference single end operational amplifier (221), it is another with being connected to circuit, 3rd resistor R5 mono-
It is connected to the input 2- of difference single end operational amplifier (221), output of the other end with difference single end operational amplifier (221)
Vs is held to be connected.
3. a kind of InGaAs short-wave infrareds detector signal processing system according to claim 2, it is characterised in that：It is described
Difference single end operational amplifier (221) be more than 750k Ω, input capacitance for input impedance and be less than 15pF, and it is zero defeated to possess power-off
Go out the device of characteristic, difference single end operational amplifier (221) includes built-in equivalent input capacitance, the first source side resistance R1, the
Two source side resistance R2 constitute a low-pass filter circuit with the equivalent input capacitance of difference single end operational amplifier (221).
4. a kind of InGaAs short-wave infrareds detector signal processing system according to claim 1, it is characterised in that：It is described
The first source side resistance R1, the second source side resistance R2 resistance be less than or equal to 50 Ω, in order to ensure circuit balancing, the first source electricity
The resistance for hindering R1 and the second source side resistance R2 is equal.
5. a kind of InGaAs short-wave infrareds detector signal processing system according to claim 2, it is characterised in that：It is described
First resistor R3, second resistance R4,3rd resistor R5 value relatable need to meet R3 value and be equal to R4 and R5 parallel values.
6. a kind of InGaAs short-wave infrareds detector signal processing system according to claim 2, it is characterised in that：It is described
The gain of the single-ended change-over circuit of difference be
7. a kind of InGaAs short-wave infrareds detector signal processing system according to claim 1, it is characterised in that：It is described
Signal condition filter circuit include single-ended transfer difference circuit and low-pass filter circuit two parts；
Single-ended transfer difference circuit includes differential operational amplifier (231), the 4th resistance R6, the 5th resistance R7, the 6th resistance R8, the
Seven resistance R9；
Low-pass filter circuit includes the 8th resistance R10, the 9th resistance R11 and electric capacity C1；
It is defeated that differential operational amplifier (231) includes in-phase input end, inverting input, output end in the same direction, reversed-phase output, common mode
Enter to hold VVCM；
A 4th resistance R6 end is connected to the output end V of difference single end operational amplifier (221)s, the 4th resistance R6 another termination
To the in-phase input end of differential operational amplifier (231), a 5th resistance R7 termination circuit, the 5th resistance R7 other end
The inverting input of differential operational amplifier (231) is connected to, the 6th resistance R8 two ends are respectively connected to differential operational amplifier
(231) in-phase input end and reversed-phase output, the 7th resistance R9 two ends are respectively connected to the anti-of differential operational amplifier (231)
Phase input and in-phase output end；The common mode input V of differential operational amplifier (231)VCMIt is connected with analog to digital conversion circuit；
8th resistance R10 one end is connected to the reversed-phase output of differential operational amplifier (231), and on the one hand the other end is used as modulus
One end of the inverting input of change-over circuit, on the other hand connection electric capacity C1, the 9th resistance R11 one end is connected to calculus of differences and put
On the one hand the in-phase output end of big device (231), the other end as the in-phase input end of analog to digital conversion circuit, on the other hand connects electricity
Hold the C1 other end.
8. a kind of InGaAs short-wave infrareds detector signal processing system according to claim 7, it is characterised in that：It is described
Resistance R6=R7=R8=R9=510 Ω.
9. a kind of InGaAs short-wave infrareds detector signal processing system according to claim 7, it is characterised in that：It is described
The cut-off frequency f of low-pass filter circuitpMore than the output pixel clock frequency f of InGaAs short-wave infrared detectorss5 times, i.e.,And R10=R11.
10. a kind of InGaAs short-wave infrareds detector signal processing system according to claim 1, it is characterised in that：Institute
The analog to digital conversion circuit stated includes high-resolution, high-speed-differential analog-digital converter, i.e. resolution, N=14bits, high-speed-differential mould
The switching rate of number converter is 80MSPS.
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| CN105403309B (en) * | 2015-11-04 | 2017-05-03 | 中国电子科技集团公司第四十一研究所 | Two-color detector signal amplification control system and method |
| CN106253869A (en) * | 2016-09-26 | 2016-12-21 | 南京铁道职业技术学院 | A kind of High Speed Data Acquisition Circuit |
| CN106568230B (en) * | 2016-10-18 | 2019-07-12 | 中国电子科技集团公司第五十五研究所 | A kind of InGaAs photocathode chiller based on semiconductor refrigeration sheet |
| CN106970270B (en) * | 2017-05-26 | 2023-05-12 | 吉林大学 | Long-period ground electric signal acquisition system and measurement method |
| CN109587398B (en) * | 2018-12-13 | 2023-12-08 | 中国科学院西安光学精密机械研究所 | Satellite-borne short-wave infrared signal processing circuit and processing method |
| CN111030670A (en) * | 2019-12-20 | 2020-04-17 | 中国科学院长春光学精密机械与物理研究所 | Infrared imaging processing circuit and infrared detection system |
| CN113114253B (en) * | 2021-05-28 | 2024-07-23 | 西北核技术研究所 | Analog signal conditioning system applied to ultra-high-speed data acquisition system |
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