Successive approximation type analog-to-digital converter and electronic equipment

Abstract

The invention relates to a successive approximation type analog-to-digital converter and electronic equipment. The analog-to-digital converter comprises a successive approximation device, the first output end of which outputs a first signal of a differential signal in a successive approximation manner, the second output end of which outputs a second signal of the differential signal in a successive approximation manner, and the third output end of which outputs a multi-bit digital signal; the output end of the comparator is coupled with the input end of the successive approximation device, the first input end of the comparator is coupled with the first output end of the successive approximation device, and the second input end of the comparator is coupled with the second output end of the successive approximation device; the first reversing device can generate reverse voltage jump so as to counteract the voltage change of the first input end caused by kickback noise when the second signal of the differential signal changes; and / or the second reversing device can generate reverse voltage jump so as to counteract the voltage change of the second input end caused by kickback noise when the first signal of the differential signal changes. According to the invention, the influence of kickback noise can be reduced, and the precision of the analog-to-digital converter is improved.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a successive approximation analog-to-digital converter and electronic equipment. Background technique [0002] An analog-to-digital converter (ADC) is a device capable of converting an analog signal into a digital signal. A successive approximation ADC (SAR ADC) is a common analog-to-digital converter. A SAR ADC / ADC generally includes a comparator and one or more digital-to-analog converters (English: digital to analog converter, DAC). A DAC is a device that converts digital signals into analog signals. In some low-power applications, DACs are often in the form of capacitor arrays. Another form of resistor array has quiescent current draw. The capacitor array form consumes no static power. [0003] Due to the parasitic capacitance between the positive and negative input terminals of the comparator, in actual operation, when the signal output from the DAC to one in...

AI Technical Summary

Problems solved by technology

The error caused by this kickback noise will affect the result of the comparator, thereby affecting the output result of the ADC, resulting in a decrease in the conversion accuracy of the ADC

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