Method for eliminating errors of analog-to-digital conversion circuit system

Abstract

The invention discloses a method for eliminating errors of an analog-to-digital conversion circuit system. The method includes the following steps that firstly, based on the conventional analog-to-digital conversion circuit system composed of an analog signal sampling and holding module and an ADC, the common-mode voltage VCOM of the ADC is calculated; secondly, the common-mode voltage VCOM of the ADC is used as input quantity to be input to the analog signal sampling and holding module; thirdly, the acquired value is the final digital quantity D0-2(n-1), wherein n is the bit of the ADC. The method for eliminating the errors of the analog-to-digital conversion circuit system is novel, accurate conversion of the analog-to-digital conversion system is achieved, and good linearity is guaranteed within the full-input range.

Description

technical field [0001] The invention relates to a method for eliminating system errors, in particular to a method for eliminating system errors of an analog-to-digital conversion circuit. Background technique [0002] At present, the working process of conventional technology is: after the input signal is processed by the analog signal sampling and holding module, it is sent to the ADC for conversion to obtain the corresponding digital quantity, but both the analog signal sampling and holding module and the ADC module itself will have system errors, and the obtained The digital quantity contains system error, and the amount of error depends on the performance of the two modules. No matter how excellent the module design is, the system error always exists and will never be eliminated. In the end, it will affect the accuracy and linearity of the digital quantity. Contents of the invention [0003] The present invention provides a kind of method for eliminating the system err...

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Problems solved by technology

[0002] At present, the working process of conventional technology is: after the input signal is processed by the analog signal sampling and holding module, it is sent to the ADC for conversion to obtain the corresponding digital quantity, but both the analog signal sampling and holding module and the ADC module itself will have system errors, and the obtained Digital quantities contain system errors, and the amount of errors depends on the performance of the two modules. No matter how excellent the module design is, system errors always exist and can never be eliminated. In the end, it will affect the accuracy and linearity of digital quantities.

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