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Method and system for realizing high-resolution analog-to-digital conversion by low-resolution ADC (Analog to Digital Converter)

An analog-to-digital conversion, high-resolution technology, applied in the electrical field, can solve problems such as data transmission link delay, and achieve the effect of increasing data transmission rate, reducing delay, and being less susceptible to noise and interference.

Active Publication Date: 2011-10-19
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

This scheme requires an analog comparison, which will cause a delay in the data transmission link

Method used

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  • Method and system for realizing high-resolution analog-to-digital conversion by low-resolution ADC (Analog to Digital Converter)
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  • Method and system for realizing high-resolution analog-to-digital conversion by low-resolution ADC (Analog to Digital Converter)

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Embodiment Construction

[0048] The invention provides a method for realizing high-resolution analog-to-digital conversion by a low-resolution ADC, the method comprising the following steps:

[0049] 1) Post-stage preprocessing of the CCD analog signal generated by the FPA (focal plane assembly):

[0050] The purpose of post-stage preprocessing of the CCD analog signal generated by the FPA (focal plane assembly) is to make the output signal have the same change trend as the illuminance received by the CCD sensor, and to suppress the interference introduced during the transmission process and minimize the noise in the CCD output signal. Reset noise (kTC noise). Usually available figure 2 In order to suppress the interference introduced in the transmission process, the buffer circuit first buffers the received video signal, which is realized by an operational amplifier, and the gain is -1 times. The purpose of the correlated double sampling circuit CDS is to reduce the reset noise (kTC noise) of the ...

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Abstract

The invention relates to a method and a system for realizing high-resolution analog-to-digital conversion by a low-resolution ADC (Analog to Digital Converter), which aim at a CCD (Charge-coupled Device) camera. The method comprises the following steps: carrying out subsequent preprocessing on a CCD analog signal generated by an FPA (Focusing Plane Assembly); amplifying a CCD analog video signal after the preprocessing to obtain an amplified video signal; carrying out analog-to-digital conversion on the amplified video signal to obtain a low-bit ADC quantization result; and converting the low-bit quantization result into high-bit quantization result. The invention provides the method and the system for realizing high-resolution analog-to-digital conversion by the low-resolution ADC, whichaim to the CCD camera, and have small delay, high transmission ratio, strong anti-interference capability, high SNR (Signal to Noise Ratio) and wide application range.

Description

technical field [0001] The invention belongs to the field of electricity, and relates to an analog-to-digital conversion method, in particular to a method and system for realizing high-resolution analog-to-digital conversion by utilizing a low-resolution ADC for a CCD camera. Background technique [0002] CCD cameras are now widely used in astronomical detection, and their spectral range covers 300nm-1100nm. In order to make full use of the dynamic range of the CCD detector, when designing the CCD signal processing circuit and selecting the ADC, it should be satisfied that the dynamic range of the ADC is greater than that of the CCD. Current CCDs, especially scientific-grade CCDs, have a dynamic range of up to 10 5 : 1, even 10 6 : 1, at this time to satisfy DR ADC ≥DR CCD , you must choose an ADC with a resolution of 18-20bit. However, high-level, high-performance high-resolution ADCs are rare and expensive, so in signal processing circuits, the following two situation...

Claims

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Application Information

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IPC IPC(8): H04N5/30H04N5/372
Inventor 邱跃洪陈智文延汶德胜姚大雷江宝钽高博
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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