A self-adaptive digital calibration technique for multi-channel high resolution capacitive SAR ADCs

This paper introduces a self-adaptive digital technique to calibrate multi-channel SAR ADCs. Rather than achieving higher resolution by adjusting the analog component values, this new digital method infers the capacitor weights of a SAR ADC with the help of a channel-shared high resolution sigma-del...

Full description

Saved in:
Bibliographic Details
Published in2017 IEEE 12th International Conference on ASIC (ASICON) pp. 730 - 733
Main Authors Binbin Lyu, Wengao Lu, Sijia Yang, Zhongjian Chen, Yacong Zhang
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.10.2017
Subjects
Calibration
Capacitance
Capacitors
digital calibration
Estimation
Mathematical model
multi-channel
SAR ADC
Sigma-delta modulation
Switches
Online AccessGet full text

Cover

More Information
Summary:This paper introduces a self-adaptive digital technique to calibrate multi-channel SAR ADCs. Rather than achieving higher resolution by adjusting the analog component values, this new digital method infers the capacitor weights of a SAR ADC with the help of a channel-shared high resolution sigma-delta ADC, which results in remarkable improvements in the capacitive SAR ADCs' property. ENOB increases from 11.06 bits to 12.67 bits. The digital calibration logic is based on LMS (least mean squares) and gradient descent.
DOI:10.1109/ASICON.2017.8252579