Title :
A 1-1-1-1 MASH delta-sigma modulator using dynamic comparator-based OTAs
Author :
Yamamoto, Kentaro ; Carusone, Anthony Chan
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON, Canada
Abstract :
A 1-1-1-1 MASH delta-sigma modulator with dynamic comparator-based OTAs as replacements for conventional OTAs is presented. The proposed OTA asynchronously alternates between input comparison and current pulse injection under digital control. The 65-nm LP CMOS prototype achieves a FoM of 276 fJ/conv-step with 70.4 dB SNDR over a 2.5-MHz bandwidth while consuming 3.73 mW from a 1.2-V supply.
Keywords :
CMOS integrated circuits; comparators (circuits); delta-sigma modulation; digital control; operational amplifiers; 1-1-1-1 MASH delta-sigma modulator; LP CMOS prototype; OTA; bandwidth 2.5 MHz; current pulse injection; digital control; dynamic comparator; power 3.73 mW; size 65 nm; voltage 1.2 V; Bandwidth; CMOS integrated circuits; Capacitors; Latches; Modulation; Multi-stage noise shaping; Power measurement;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2011 IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4577-0222-8
DOI :
10.1109/CICC.2011.6055288
