University of Electronic Science and Technology of China

Dagang Li

Yuanjun Cen

Hua Fan

Daqian Hu

Franco Maloberti

Quanyuan Feng

Hadi Heidari

Chen Wang

Dainan Zhang

Huaying Su

Lang Feng

Xiaopeng Diao

Kelin Zhang

Jingxuan Yang

Peng Lei

Jingtao Li

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

A method for improving a spurious free dynamic range and a signal-to-noise-and-distortion ratio of a capacitor-resistor combined successive approximation register analog-to-digital converter by capacitor re-configuration, the method including: 1) arranging 128 unit capacitors in a positive array and a negative array, respectively, dividing unit capacitors of symmetrical positions of the positive array and the negative array into groups to yield a total of 128 groups of capacitors; 2) acquiring 128 digital codes corresponding to 128 groups of capacitors; 3) sorting the 128 groups of capacitors from maximum to minimum according to the 128 digital codes obtained in 2), and recording the 128 groups of capacitors after sorting as C-C; and 4) selecting 64 groups of capacitors from Cto C, and reconfiguring the 64 groups of capacitors in capacitor arrays of the capacitor-resistor analog-to-digital converter.

Method for improving spurious free dynamic range (SFDR) and signal-to-noise-and-distortion ratio (SNDR) of capacitor-resistor combined successive approximation register (SAR) analog-to-digital converter (ADC) by capacitor re-configuration

A method of arranging a capacitor array of a successive approximation register analog-to-digital converter in a successive approximation process, the method including: splitting a binary capacitor array into unit capacitors, then sorting, grouping, and rotating the original binary capacitive array involved in successive approximation conversion.

Method of arranging capacitor array of successive approximation register analog-to-digital converter

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Chengdu, China

Dagang Li