University of Electronic Science and Technology of China

Kelin Zhang

Chen Wang

Yuanjun Cen

Hua Fan

Quanyuan Feng

Dainan Zhang

Dagang Li

Daqian Hu

Xiaopeng Diao

Peng Lei

Lang Feng

A method of calibrating capacitive array of a resistor-capacitor hybrid successive approximation register analog-to-digital converter (RC-hybrid SAR ADC) that includes a high M-bit capacitor DAC and a low N-bit resistor DAC. The method includes: disposing n unit capacitors in each capacitive array of the RC-hybrid SAR ADC, wherein n=2; sorting the capacitors in an ascending order according to their capacitances to form a sorted array, and selecting two capacitors C*, C* in the middle positions as a least significant bit (LSB) capacitor and a dummy capacitor, respectively; obtaining a new array by forming each capacitor through adding two capacitors which have symmetrical positions with respect to the middle position(s) in the sorted array; and sorting the new array in an ascending order, and selecting the capacitor in the middle position as a higher bit capacitor. The method improves the static and dynamic performance of the SAR ADC.

Method of calibrating capacitive array of successive approximation register analog-to-digital converter

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Chengdu, China

Kelin Zhang