Title :
15.4b incremental sigma-delta capacitance-to-digital converter with zoom-in 9b asynchronous SAR
Author :
Sechang Oh ; Wanyeong Jung ; Kaiyuan Yang ; Blaauw, D. ; Sylvester, Dennis
Author_Institution :
Univ. of Michigan, Ann Arbor, MI, USA
Abstract :
An incremental zoom-in capacitance-to-digital converter (CDC) is proposed. By using a 9b SAR, the OSR can be reduced to only 32, significantly improving conversion energy. We show how the OTA in the SAR is bypassed for the CDC further reducing energy and propose a novel matrix based 512-element unit-cap structure for dynamic element matching. The CDC achieves 94.7dB SNR and 33.7μW power consumption with 175fJ/conv-step at 1.4V supply.
Keywords :
sigma-delta modulation; CDC; OSR; SNR; dynamic element matching; energy conversion; incremental sigma-delta capacitance-to-digital converter; matrix based 512-element unit-cap structure; over-sampling ratio; power 33.7 muW; voltage 1.4 V; word length 15.4 bit; word length 9 bit; zoom-in asynchronous SAR; Abstracts; Accuracy; Capacitance; Clocks; Indexes; Periodic structures; Power measurement;
Conference_Titel :
VLSI Circuits Digest of Technical Papers, 2014 Symposium on
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4799-3327-3
DOI :
10.1109/VLSIC.2014.6858443
