SAR ADC circuit, electronic equipment and method

Abstract

The invention discloses an SAR ADC circuit, electronic equipment and a method. The SAR ADC circuit comprises a charge redistribution DAC module, a comparator and a common-mode voltage output module, wherein the common-mode voltage output module outputs a first common-mode voltage to the positive end of the comparator and outputs a second common-mode voltage to the negative end of the comparator. The SAR ADC circuit further comprises a rectifying DAC module. The rectifying DAC module is connected between the common-mode voltage output module and the positive end / the negative end of the comparator, and is used for carrying out digital-to-analog conversion processing on the voltage output by the common-mode voltage output module to adjust the intensity of the first common-mode voltage or the intensity of the second common-mode voltage, thus to rectify the offset of the SAR ADC circuit. According to the SAR ADC circuit, the electronic equipment and the method, digital-to-analog conversion processing is carried out on the first common-mode voltage or the second common-mode voltage to adjust the intensity of the first common-mode voltage or the intensity of the second common-mode voltage, the offset of the SAR ADC circuit can be rectified effectively and accurately, and the SAR ADC circuit, the electronic equipment and the method are quite practical.

Description

technical field [0001] The invention relates to the technical field of analog-to-digital conversion, in particular to a SAR ADC circuit, electronic equipment and a method. Background technique [0002] In recent years, with the rapid development of digital signal processing technology, information processing tasks such as filtering, frequency conversion, modulation / demodulation, etc. have entered the digital field. Analog-to-digital converters, which bridge the gap between analog and digital signals, are used in televisions, mobile devices, and other consumer electronics to process analog signals in the real world using powerful digital signal processing techniques. Has been extremely widely used. [0003] Successive Approximation Register Analog to Digital Converter (Successive Approximation Register Analog to Digital Converter, referred to as SAR ADC) is a common analog-to-digital conversion structure for medium to high resolution applications, which uses a series of stag...

AI Technical Summary

Problems solved by technology

However, various conditions such as the offset of the comparator itself in the SAR ADC, the unbalance between the ground of the SAR ADC chip and the ground of the PCB board, the mismatch of the capacitor, and the irrational factors of the switch will cause the offset of the SAR ADC, thus As a result, the tested signal within a certain range cannot be effectively measured by the ADC. Therefore, a technical solution is needed to solve the problem of SAR ADC offset

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