Successive approximation analog-to-digital converter and a digital calibration method and device thereof

Abstract

The invention discloses a successive approximation analog-to-digital converter and a digital calibration method and device thereof. The successive approximation analog-to-digital converter comprises adigital-to-analog conversion module DAC. The method comprises the following steps: obtaining a calibration code of a conversion bit corresponding to a capacitor needing to be calibrated, converting an input analog signal according to a normal successive approximation mode to obtain a binary conversion value, and calculating the sum of calibration codes of the conversion bit corresponding to the conversion value of 1 in the binary conversion value; and calculating a difference value between the binary conversion value and the sum of the calibration codes of which the conversion value in quasi-transposition corresponding to the capacitor to be calibrated is 1, so as to obtain the conversion value of the verified ADC. The method can effectively calibrate the mismatch error between the capacitors caused by the parasitic capacitance and the process manufacturing error, and avoid the problem that the double relation between the capacitors is inaccurate due to the mismatch error, thereby effectively improving the precision of the ADC.

Description

technical field [0001] The present invention relates to the technical field of analog-to-digital conversion, in particular to a digital calibration method for successive approximation analog-to-digital converters, a non-transitory computer-readable storage medium, and a digital calibration method for successive approximation analog-to-digital converters. device and a successive approximation analog-to-digital converter with the device. Background technique [0002] As a bridge connecting analog signals and digital signals, analog-to-digital converters are developing rapidly in integrated circuits and information industries. The comprehensive advantages of conversion speed, low power consumption and low cost have been widely used. Usually, SARADC is mainly composed of digital-to-analog converter (DAC), comparator, digital control part and other analog circuits, and its core is DAC, comparator and digital control part. [0003] As one of the key units of the charge redistrib...

AI Technical Summary

Problems solved by technology

For this reason, the first purpose of the present invention is to propose a digital calibration method for successive approximation analog-to-digital converters, which can effectively calibrate the mismatch error between capacitances caused by parasitic capacitances and process manufacturing errors, and avoid Mismatch errors cause inaccurate doubling of the relationship between capacitors, which can effectively improve the accuracy of the ADC

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