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
本发明公开了一种InGaAs短波红外探测器信号处理系统,包括InGaAs短波红外探测器、信号输入端、差分单端转换电路、信号调理滤波电路、模数转换电路、数据处理电路。该系统通过差分单端转换电路实现信号的阻抗匹配、放大、主备份接口支持,信号再经过信号调理滤波电路处理,进入模数转换电路输出数字形式的数据,并将数据最终传入数据处理电路中。与传统InGaAs短波红外探测器信号处理系统相比具有电路引入噪声低、输入端支持系统主备份、抗干扰能力强等特点。
The invention discloses an InGaAs short-wave infrared detector signal processing system, which comprises an InGaAs short-wave infrared detector, a signal input terminal, a differential single-end conversion circuit, a signal conditioning filter circuit, an analog-to-digital conversion circuit, and a data processing circuit. The system realizes signal impedance matching, amplification, and main-backup interface support through a differential single-ended conversion circuit. The signal is processed by a signal conditioning filter circuit, and then enters an analog-to-digital conversion circuit to output digital data, and finally transmits the data to a data processing circuit. middle. Compared with the traditional InGaAs short-wave infrared detector signal processing system, it has the characteristics of low noise introduced by the circuit, the input terminal supports system main backup, and strong anti-interference ability.
Description
技术领域technical field
本发明涉及一种信号处理系统,特别是一种InGaAs短波红外探测器信号处理系统,属于信号处理领域。The invention relates to a signal processing system, in particular to an InGaAs short-wave infrared detector signal processing system, which belongs to the field of signal processing.
背景技术Background technique
InGaAs短波红外探测器是近年来新兴一种线阵非制冷红外探测器,相比于传统的制冷型红外器件,在具备相近性能的情况下,兼具体积小、成本低、功耗低等特点,特别适合应用在军事侦察和航天遥感领域。InGaAs短波红外探测器的输出信号具有如下特点:1)输出内阻大,通常要求较小的负载电容和较大的负载电阻;2)较高的电路噪声指标要求;3)一般采用差分模拟输出方式;4)每个像元信号在建立后保持一个固定的电平值。针对上述信号输出特点,如何设计一套能够满足要求的信号处理系统对于成像电路的达到理想的成像效果是非常关键的。InGaAs short-wave infrared detector is a new type of linear array uncooled infrared detector in recent years. Compared with traditional cooled infrared devices, it has the characteristics of small size, low cost and low power consumption with similar performance. , especially suitable for application in the fields of military reconnaissance and aerospace remote sensing. The output signal of the InGaAs short-wave infrared detector has the following characteristics: 1) The output internal resistance is large, usually requiring a smaller load capacitance and a larger load resistance; 2) Higher circuit noise index requirements; 3) Generally, differential analog output is used 4) Each pixel signal maintains a fixed level value after it is established. According to the above signal output characteristics, how to design a signal processing system that can meet the requirements is very critical for the imaging circuit to achieve the ideal imaging effect.
传统的InGaAs短波红外探测器信号处理系统,通常采用射级跟随电路对每个通道的信号分别实现阻抗匹配,然后在经过差分运算放大器对输出的模拟差分信号直接进行放大和滤波,最后送入模数转换器进行模数转换。这种处理方式有以下几点不足之处:1)采用射级跟随电路对两个通道分别进行阻抗匹配,会由于两通道电路的参数差异,特别是运算放大器的参数差异导致差分信号失衡,相当于引入了差模噪声;2)采用设计跟随电路的方式,两通道由于器件漂移对直流电平信号影响较大,会导致成像系统的图像数据不稳定;3)采用设计跟随电路的方式只能将对模拟信号的放大环节置于模拟信号通道的后级,不利于对整个系统电路噪声的抑制;4)两个通道采用两片运算放大器构成射级跟随电路,相比于单片器件会增加额外的功耗,同时也会增大电路占用的面积;5)传统的设计都没有考虑模拟信号主备份接口的支持问题,这无疑限制了系统的应用范围,不利于系统可靠性的提升。The traditional InGaAs shortwave infrared detector signal processing system usually uses an emitter follower circuit to achieve impedance matching for each channel signal, and then directly amplifies and filters the output analog differential signal through a differential operational amplifier, and finally sends it to the analog The digital converter performs analog-to-digital conversion. This processing method has the following disadvantages: 1) Using the emitter follower circuit to perform impedance matching on the two channels respectively will cause the differential signal to be unbalanced due to the parameter difference of the two channel circuits, especially the parameter difference of the operational amplifier, which is quite Because of the introduction of differential mode noise; 2) The design of the follower circuit is adopted, and the device drift of the two channels has a great influence on the DC level signal, which will cause the image data of the imaging system to be unstable; 3) The design of the follower circuit can only The amplifying link of the analog signal is placed in the rear stage of the analog signal channel, which is not conducive to the suppression of the noise of the entire system circuit; 4) Two channels use two operational amplifiers to form an emitter follower circuit, which will increase additional 5) The traditional design does not consider the support of the main and backup interfaces of the analog signal, which undoubtedly limits the application range of the system and is not conducive to the improvement of system reliability.
发明内容Contents of the invention
本发明的技术解决问题是:克服现有技术的不足,提供了一种InGaAs短波红外探测器信号处理系统,解决了传统同类系统所存在的两通道信号失衡、信号放大环节位于信号通道后级引入额外的电路噪声以及传统系统不支持输入端主备接口的问题。The problem solved by the technology of the present invention is: to overcome the deficiencies of the prior art, to provide an InGaAs short-wave infrared detector signal processing system, which solves the two-channel signal imbalance existing in the traditional similar system, and the signal amplification link is introduced after the signal channel Additional circuit noise and the problem that traditional systems do not support active and standby interfaces at the input.
本发明的技术解决方案是:一种InGaAs短波红外探测器信号处理系统,包括:InGaAs短波红外探测器、信号输入端、差分单端转换电路、信号调理滤波电路、模数转换电路、数据处理电路;其中InGaAs短波红外探测器,负责将探测到的光信号转换为差分电信号送至信号输入端;信号输入端包括第一源端电阻R1和第二源端电阻R2;The technical solution of the present invention is: an InGaAs short-wave infrared detector signal processing system, including: an InGaAs short-wave infrared detector, a signal input terminal, a differential single-ended conversion circuit, a signal conditioning filter circuit, an analog-to-digital conversion circuit, and a data processing circuit ; wherein the InGaAs short-wave infrared detector is responsible for converting the detected optical signal into a differential electrical signal and sending it to the signal input terminal; the signal input terminal includes a first source terminal resistance R1 and a second source terminal resistance R2;
信号输入端,将差分电信号经第一源端电阻R1和第二源端电阻R2匹配后,输出与差分单端转换电路匹配的差分电信号,作为差分单端转换电路的输入,第一源端电阻R1和第二源端电阻R2的一端分别接至InGaAs短波红外探测器信号输出端,第一源端电阻R1和第二源端电阻R2的另一端作为差分单端转换电路的输入;The signal input terminal, after matching the differential electrical signal through the first source terminal resistance R1 and the second source terminal resistance R2, outputs a differential electrical signal matching the differential single-end conversion circuit as the input of the differential single-end conversion circuit, the first source One end of the end resistance R1 and the second source end resistance R2 are respectively connected to the signal output end of the InGaAs short-wave infrared detector, and the other ends of the first source end resistance R1 and the second source end resistance R2 are used as the input of the differential single-end conversion circuit;
差分单端转换电路,将输入的差分信号转换为单端信号送至信号调理滤波电路,并对输入的差分信号实现阻抗匹配,将输入的差分信号进行放大,同时差分单端转换电路也作为系统主备份的接口;The differential single-ended conversion circuit converts the input differential signal into a single-ended signal and sends it to the signal conditioning filter circuit, and realizes impedance matching for the input differential signal, and amplifies the input differential signal. At the same time, the differential single-ended conversion circuit is also used as a system Primary and backup interfaces;
信号调理滤波电路,对差分单端转换电路送来的单端信号进行滤波和调理,得到模数转换电路输入动态范围内的模拟差分信号,送至模数转换电路;The signal conditioning filter circuit performs filtering and conditioning on the single-ended signal sent by the differential single-ended conversion circuit, obtains an analog differential signal within the dynamic range input by the analog-to-digital conversion circuit, and sends it to the analog-to-digital conversion circuit;
模数转换电路,将信号调理滤波电路送来的模拟差分信号转换为并行的数字信号,送至数据处理电路;The analog-to-digital conversion circuit converts the analog differential signal sent by the signal conditioning filter circuit into a parallel digital signal and sends it to the data processing circuit;
数据处理电路,对模数转换电路送来的数字信号实现数字滤波然后进行并串转换,得到相应的串行数据,并将该数据打包成所需的数据格式。The data processing circuit implements digital filtering on the digital signal sent by the analog-to-digital conversion circuit and then performs parallel-to-serial conversion to obtain corresponding serial data, and packs the data into the required data format.
本发明与现有技术相比的优点在于:The advantage of the present invention compared with prior art is:
(1)本发明在差分单端转换电路中采用具备断电零输出特性的差分单端运算放大器,能够支持输入信号主备份接口。(1) The present invention adopts a differential single-ended operational amplifier with power-off zero output characteristics in the differential single-ended conversion circuit, which can support the main backup interface of the input signal.
(2)本发明将模拟信号的放大环节置于系统前级,即差分单端转换电路中,可以有效的避免对后级电路引入噪声的放大。(2) The present invention places the amplifying link of the analog signal in the front stage of the system, that is, the differential single-ended conversion circuit, which can effectively avoid the amplification of introducing noise to the subsequent stage circuit.
(3)本发明差分单端转换电路中所用差分单端运算放大器构成的阻抗匹配电路较之射级跟随电路具备更好的电路对称特性。(3) The impedance matching circuit formed by the differential single-ended operational amplifier used in the differential single-ended conversion circuit of the present invention has better circuit symmetry characteristics than the emitter follower circuit.
(4)本发明采用的各部分电路有更少的元件、更小的占用面积和更小的功耗。(4) Each part of the circuit adopted by the present invention has fewer components, smaller occupied area and lower power consumption.
附图说明Description of drawings
图1为本发明信号处理系统的原理图;Fig. 1 is the schematic diagram of signal processing system of the present invention;
图2为本发明差分单端转换电路原理图;Fig. 2 is a schematic diagram of a differential single-ended conversion circuit of the present invention;
图3为本发明信号调理滤波电路原理图;Fig. 3 is a schematic diagram of the signal conditioning filter circuit of the present invention;
图4为本发明所实现的成像电路信噪比实测图。FIG. 4 is an actual measurement diagram of the signal-to-noise ratio of the imaging circuit realized by the present invention.
具体实施方式detailed description
本发明的思路是:根据InGaAs短波红外探测器输出信号的特点,首先通过差分单端转换电路将探测器输出的差分信号转换为单端信号并对信号进行放大,然后对信号进行调理滤波并完成模数转换,最终将转换后的数据进行数字滤波、并串转换,之后打包成所需的数据格式;同时根据所选差分单端运算放大器的断电零输出特点,实现对输入信号主备份接口的支持。The idea of the present invention is: according to the characteristics of the output signal of the InGaAs short-wave infrared detector, firstly, the differential signal output by the detector is converted into a single-ended signal through a differential single-ended conversion circuit and the signal is amplified, and then the signal is conditioned and filtered to complete Analog-to-digital conversion, and finally the converted data is digitally filtered, parallel-to-serial converted, and then packaged into the required data format; at the same time, according to the power-off zero output characteristics of the selected differential single-ended operational amplifier, the main backup interface for the input signal is realized support.
下面结合附图对本发明进行详细说明。The present invention will be described in detail below in conjunction with the accompanying drawings.
如图1所示,为本发明一种InGaAs短波红外探测器信号处理系统的原理图,包括InGaAs短波红外探测器、信号输入端、差分单端转换电路、信号调理滤波电路、模数转换电路、数据处理电路,其中数据处理电路采用可编程逻辑器件实现。InGaAs短波红外探测器将探测到的光信号转换为差分电信号送至信号输入端;信号输入端包括第一源端电阻R1和第二源端电阻R2;As shown in Figure 1, it is a schematic diagram of an InGaAs short-wave infrared detector signal processing system of the present invention, including an InGaAs short-wave infrared detector, a signal input terminal, a differential single-ended conversion circuit, a signal conditioning filter circuit, an analog-to-digital conversion circuit, A data processing circuit, wherein the data processing circuit is realized by a programmable logic device. The InGaAs short-wave infrared detector converts the detected optical signal into a differential electrical signal and sends it to the signal input terminal; the signal input terminal includes a first source terminal resistance R1 and a second source terminal resistance R2;
信号输入端,将差分电信号经第一源端电阻R1和第二源端电阻R2匹配后,输出与差分单端转换电路匹配的差分电信号,作为差分单端转换电路的输入,第一源端电阻R1和第二源端电阻R2的一端分别接至InGaAs短波红外探测器信号输出端,第一源端电阻R1和第二源端电阻R2的另一端作为差分单端转换电路的输入;The signal input terminal, after matching the differential electrical signal through the first source terminal resistance R1 and the second source terminal resistance R2, outputs a differential electrical signal matching the differential single-end conversion circuit as the input of the differential single-end conversion circuit, the first source One end of the end resistance R1 and the second source end resistance R2 are respectively connected to the signal output end of the InGaAs short-wave infrared detector, and the other ends of the first source end resistance R1 and the second source end resistance R2 are used as the input of the differential single-end conversion circuit;
差分单端转换电路,将输入的差分信号转换为单端信号送至信号调理滤波电路,并对输入的差分信号实现阻抗匹配,将输入的差分信号进行放大,同时差分单端转换电路也作为系统主备份的接口;The differential single-ended conversion circuit converts the input differential signal into a single-ended signal and sends it to the signal conditioning filter circuit, and realizes impedance matching for the input differential signal, and amplifies the input differential signal. At the same time, the differential single-ended conversion circuit is also used as a system Primary and backup interfaces;
信号调理滤波电路,对差分单端转换电路送来的单端信号进行滤波和调理,得到模数转换电路输入动态范围内的模拟差分信号,送至模数转换电路;The signal conditioning filter circuit performs filtering and conditioning on the single-ended signal sent by the differential single-ended conversion circuit, obtains an analog differential signal within the dynamic range input by the analog-to-digital conversion circuit, and sends it to the analog-to-digital conversion circuit;
模数转换电路,将信号调理滤波电路送来的模拟差分信号转换为并行的数字信号,送至数据处理电路;The analog-to-digital conversion circuit converts the analog differential signal sent by the signal conditioning filter circuit into a parallel digital signal and sends it to the data processing circuit;
数据处理电路,对模数转换电路送来的数字信号实现数字滤波然后进行并串转换,得到相应的串行数据,并将该数据打包成所需的数据格式。The data processing circuit implements digital filtering on the digital signal sent by the analog-to-digital conversion circuit and then performs parallel-to-serial conversion to obtain corresponding serial data, and packs the data into the required data format.
如图1所示,第一源端电阻R1、第二源端电阻R2同差分单端转换电路中差分单端运算放大器221的等效输入电容构成低通滤波电路,第一源端电阻R1、第二源端电阻R2的两端分别接至InGaAs短波红外探测器的输出端和差分单端运算放大器221的输入端Vi+、Vi-。第一源端电阻R1、第二源端电阻R2的阻值的选择需满足以下要求:1)差分信号的信号对称要求,即R1=R2;2)源端匹配要求,一般选取R1=R2<50Ω。第一源端电阻R1和第二源端电阻R2主要作为输入接口的源端匹配电阻使用,目的是防止电路的信号反射。As shown in FIG. 1, the first source resistor R1, the second source resistor R2 and the equivalent input capacitance of the differential single-ended operational amplifier 221 in the differential single-ended conversion circuit form a low-pass filter circuit. The first source resistors R1, Both ends of the second source resistor R2 are respectively connected to the output terminal of the InGaAs short-wave infrared detector and the input terminals Vi+ and Vi− of the differential single-ended operational amplifier 221 . The selection of the resistance values of the first source terminal resistor R1 and the second source terminal resistor R2 needs to meet the following requirements: 1) The signal symmetry requirement of the differential signal, that is, R1=R2; 2) The source terminal matching requirement, generally select R1=R2< 50Ω. The first source resistor R1 and the second source resistor R2 are mainly used as source matching resistors of the input interface to prevent circuit signal reflection.
差分单端转换电路主要实现差分电信号的阻抗匹配、差分电信号的放大和系统的主备份接口支持功能,其原理图如图2所示,包括第一电阻R3、第二电阻R4、第三电阻R5和差分单端运算放大器211,差分单端运算放大器221包括差分输入端1+、差分输入端1-、差分输入端2+、差分输入端2-、输出端Vs以及等效输入电容,差分输入端1+、差分输入端1-分别连接第一源端电阻R1和第二源端电阻R2的一端,同时第一源端电阻R1和第二源端电阻R2的一端也同差分单端运算放大器221的等效输入电容相连。第一电阻R3一端接至差分单端运算放大器221的输入端2+,另一端接至电路地,第二电阻R4一端接至差分单端运算放大器221的输入端2-,另一端接至电路地,第三电阻R5一端接至差分单端运算放大器221的输入端2-,另一端同差分单端运算放大器221的输出端Vs相连。差分单端转换电路将差分信号转换为单端信号,主要是为了去除差分电信号中所含有的共模直流电平,差分单端转换电路将信号放大环节置于系统的最前端,是为了避免将后级的电路噪声放大,同时兼顾阻抗匹配的功能,差分单端运算放大器211为输入阻抗大于750kΩ、输入电容小于15pF并具备断电零输出特性的器件,其中高输入阻抗、低输入电容特性是为了满足同InGaAs短波红外探测器输出差分电信号的匹配,而断电零输出特性则是为了实现对主备份接口的支持,为保证电路平衡,第一电阻R3、第二电阻R4、第三电阻R5的取值应满足R3=R4//R5;差分单端转换电路的电路增益为 The differential single-ended conversion circuit mainly realizes the impedance matching of the differential electrical signal, the amplification of the differential electrical signal and the support function of the main backup interface of the system. Its schematic diagram is shown in Figure 2, including the first resistor R3, the second resistor R4, the third resistor Resistor R5 and differential single-ended operational amplifier 211, differential single-ended operational amplifier 221 includes differential input terminal 1+, differential input terminal 1-, differential input terminal 2+, differential input terminal 2-, output terminal Vs and equivalent input capacitance, The differential input terminal 1+ and the differential input terminal 1- are respectively connected to one end of the first source terminal resistor R1 and the second source terminal resistor R2, and at the same time, one terminal of the first source terminal resistor R1 and the second source terminal resistor R2 is also the same as the differential single-ended The equivalent input capacitance of the operational amplifier 221 is connected. One end of the first resistor R3 is connected to the input terminal 2+ of the differential single-ended operational amplifier 221, and the other end is connected to the circuit ground. One end of the second resistor R4 is connected to the input terminal 2- of the differential single-ended operational amplifier 221, and the other end is connected to the circuit ground. One terminal of the third resistor R5 is connected to the input terminal 2 − of the differential single-ended operational amplifier 221 , and the other terminal is connected to the output terminal Vs of the differential single-ended operational amplifier 221 . The differential single-ended conversion circuit converts the differential signal into a single-ended signal, mainly to remove the common-mode DC level contained in the differential electrical signal. The differential single-ended conversion circuit places the signal amplification link at the front end of the system to avoid the The circuit noise amplification of the subsequent stage takes into account the function of impedance matching. The differential single-ended operational amplifier 211 is a device with an input impedance greater than 750kΩ, an input capacitance less than 15pF, and a power-off zero output characteristic. The characteristics of high input impedance and low input capacitance are In order to meet the matching with the differential electrical signal output by the InGaAs short-wave infrared detector, and the power-off zero output feature is to realize the support for the main backup interface. In order to ensure the balance of the circuit, the first resistor R3, the second resistor R4, and the third resistor The value of R5 should satisfy R3=R4//R5; the circuit gain of the differential single-ended conversion circuit is
信号调理滤波电路,包括单端转差分电路和低通滤波电路两部分,原理图如图3所示,单端转差分电路包括差分运算放大器231、第四电阻R6、第五电阻R7、第六电阻R8、第七电阻R9;低通滤波电路包括第八电阻R10、第九电阻R11和电容C1;差分运算放大器231包括同相输入端、反相输入端、同向输出端、反相输出端、共模输入端VVCM;第四电阻R6的一端接至差分单端运算放大器221的输出端Vs,第四电阻R6的另一端接至差分运算放大器231的同相输入端,第五电阻R7的一端接电路地,第五电阻R7的另一端接至差分运算放大器231的反相输入端,第六电阻R8的两端分别接至差分运算放大器231的同相输入端和反相输出端,第七电阻R9的两端分别接至差分运算放大器231的反相输入端和同相输出端;差分运算放大器231的共模输入端VVCM与模数转换电路相连;第八电阻R10一端连接至差分运算放大器231的反相输出端,另一端一方面作为模数转换电路的反相输入端,另一方面连接电容C1的一端,第九电阻R11一端连接至差分运算放大器231的同相输出端,另一端一方面作为模数转换电路的同相输入端,另一方面连接电容C1的另一端;由于单端转差分电路平衡特性的要求,第四电阻R6、第五电阻R7、第六电阻R8、第七电阻R9的阻值应满足R6=R7=R8=R9=510Ω,同样低通滤波电路中的第八电阻R10、第九电阻R11也应满足差分电路平衡特性的要求,即R10=R11。低通滤波电路能够起到在信号进入模数转换电路前滤除一部分的高频噪声,但为了保证探测器输出的差分电信号信号不会丢失有效信息,滤波器的截止频率fp应大于InGaAs短波红外探测器的输出像元时钟频率fs的5倍,即信号调理滤波电路将单端信号转换为差分信号,主要是为了满足同后级模数转换电路的接口要求,同时在信号进行模数转换前尽可能的滤除噪声干扰。The signal conditioning filter circuit includes two parts: a single-end to differential circuit and a low-pass filter circuit. The schematic diagram is shown in FIG. The resistor R8 and the seventh resistor R9; the low-pass filter circuit includes the eighth resistor R10, the ninth resistor R11 and the capacitor C1; the differential operational amplifier 231 includes a non-inverting input terminal, an inverting input terminal, a non-inverting output terminal, an inverting output terminal, Common-mode input terminal V VCM ; one end of the fourth resistor R6 is connected to the output terminal V s of the differential single-ended operational amplifier 221, the other end of the fourth resistor R6 is connected to the non-inverting input terminal of the differential operational amplifier 231, and the fifth resistor R7 One end is connected to the circuit ground, the other end of the fifth resistor R7 is connected to the inverting input end of the differential operational amplifier 231, the two ends of the sixth resistor R8 are respectively connected to the non-inverting input end and the inverting output end of the differential operational amplifier 231, and the seventh The two ends of the resistor R9 are respectively connected to the inverting input terminal and the non-inverting output terminal of the differential operational amplifier 231; the common-mode input terminal V VCM of the differential operational amplifier 231 is connected to the analog-to-digital conversion circuit; one end of the eighth resistor R10 is connected to the differential operational amplifier The inverting output terminal of 231, the other end is used as the inverting input end of the analog-to-digital conversion circuit on the one hand, and one end of the capacitor C1 is connected on the other hand, one end of the ninth resistor R11 is connected to the non-inverting output end of the differential operational amplifier 231, and the other end is a On the one hand, it is used as the non-inverting input terminal of the analog-to-digital conversion circuit, on the other hand, it is connected to the other end of the capacitor C1; due to the requirements of the balance characteristics of the single-ended to differential circuit, the fourth resistor R6, the fifth resistor R7, the sixth resistor R8, and the seventh resistor The resistance value of R9 should satisfy R6=R7=R8=R9=510Ω, and the eighth resistor R10 and the ninth resistor R11 in the low-pass filter circuit should also meet the requirements of the differential circuit balance characteristics, that is, R10=R11. The low-pass filter circuit can filter out part of the high-frequency noise before the signal enters the analog-to-digital conversion circuit, but in order to ensure that the differential electrical signal output by the detector will not lose effective information, the cut-off frequency f p of the filter should be greater than that of InGaAs The output pixel clock frequency f s of the SWIR detector is 5 times that of The signal conditioning filter circuit converts the single-ended signal into a differential signal, mainly to meet the interface requirements of the subsequent analog-to-digital conversion circuit, and to filter out noise interference as much as possible before the signal is converted to analog-to-digital.
信号调理滤波电路输出的模拟差分信号,经过模数转换电路的高分辨率(N=14bit)、高速(80MSPS)差分模数转换器进行模数转换,之后模数转换电路将并行的数据输出到数据处理电路,数据处理电路将模数转换电路送来的模拟并行的数字信号进行数字滤波、并串转换,之后将处理后的数据打包成所需的数据格式。The analog differential signal output by the signal conditioning filter circuit is converted through the high-resolution (N=14bit), high-speed (80MSPS) differential analog-to-digital converter of the analog-to-digital conversion circuit, and then the analog-to-digital conversion circuit outputs the parallel data to The data processing circuit performs digital filtering and parallel-to-serial conversion on the analog parallel digital signal sent by the analog-to-digital conversion circuit, and then packs the processed data into a required data format.
例如:InGaAs短波红外探测器像元速率为10Mhz,输出的某个像元模拟信号为Vi+=1.7V,Vi-=1.3V,若设差分单端转换电路的增益G=5,则差分单端转换电路的输出为Vs=2V,信号调理滤波电路Vvcm=1V,则信号调理滤波电路的输出V+=2V,V-=0V,设模数转换电路的动态范围为-2.5V~+2.5V,则转换后对应量化的数字信号为6554,每像元可重复采样8次,进行数字滤波后,每像元恢复为对应一个14bits数据,再经过并串转换并打包成所需的数据格式,上述像元的数据便可传输到相应的终端进行显示和进一步的分析。For example: InGaAs short-wave infrared detector pixel rate is 10Mhz, the output analog signal of a certain pixel is Vi+=1.7V, Vi-=1.3V, if the gain G of the differential single-ended conversion circuit is set to G=5, then the differential single-ended The output of the conversion circuit is Vs=2V, the signal conditioning filter circuit Vvcm =1V, then the output of the signal conditioning filter circuit V+=2V, V-=0V, the dynamic range of the analog-to-digital conversion circuit is -2.5V~+2.5V , then the corresponding quantized digital signal after conversion is 6554, and each pixel can be re-sampled 8 times. After digital filtering, each pixel is restored to a corresponding 14bits data, and then converted into parallel and serialized and packaged into the required data format. The data of the above pixel can be transmitted to the corresponding terminal for display and further analysis.
根据本发明设计的InGaAs短波红外探测器信号处理系统,在探测器输出信号为满量程80%的情况下,实际的系统信噪比测试结果如图4所示。图4纵坐标为信噪比,横坐标为像元位置,实线为系统信噪比实测结果,虚线为模数转换器的理论信噪比,该数值不包含系统其它电路噪声影响,也即系统理论信噪比的最大值。由图4可知,基于本发明设计的InGaAs短波红外探测器信号处理系统大部分像元的实测信噪比可达70dB,已接近模数转换器的信噪比理论值74dB。According to the InGaAs short-wave infrared detector signal processing system designed in the present invention, when the detector output signal is 80% of the full scale, the actual system signal-to-noise ratio test result is shown in FIG. 4 . Figure 4 is the signal-to-noise ratio on the ordinate, and the pixel position on the abscissa. The solid line is the actual measurement result of the system signal-to-noise ratio, and the dotted line is the theoretical signal-to-noise ratio of the analog-to-digital converter. This value does not include the influence of other circuit noise in the system, that is, The maximum value of the system's theoretical signal-to-noise ratio. It can be seen from Fig. 4 that the measured signal-to-noise ratio of most pixels of the InGaAs short-wave infrared detector signal processing system designed based on the present invention can reach 70dB, which is close to the theoretical value of 74dB of the signal-to-noise ratio of the analog-to-digital converter.
本发明说明书中未作详细描述的内容属本领域技术人员的公知技术。The content that is not described in detail in the description of the present invention belongs to the well-known technology of those skilled in the art.
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