Title :
A 32-channel front-end for wireless HID using inverse-STF pre-filtering technique
Author :
Galal, Sherif ; Van Engelen, Jurgen ; Welz, Jared ; Jensen, Henrik ; Abdelfattah, Khaled ; Cheung, Felix ; Arunachalam, Sasi Kumar ; Jiang, Xicheng ; Brooks, Todd
Author_Institution :
Broadcom Corp., Irvine, CA, USA
Abstract :
A 32-channel front-end circuit for wireless Human Interface Devices (HID) is described. The front-end incorporates a Sigma-Delta ADC combined with an inverse-STF pre-filtering technique to achieve 10.8 ENOB at a conversion rate of 7.5μs per channel. Chopping and digital calibration are employed to achieve an offset voltage <; 850μV and gain error <; 0.17%. The HID front-end measures single-ended rail-to-rail inputs with 1.62V to 3.63V supply range, occupies 0.28mm2 in 65nm CMOS and consumes 1.8mW from 1.2V supply.
Keywords :
filtering theory; radiocommunication; sigma-delta modulation; telecommunication computing; user interfaces; ENOB; HID front-end; digital calibration; front-end circuit; inverse-STF pre-filtering technique; inverse-STF prefiltering technique; offset voltage; sigma-delta ADC; single-ended rail-to-rail inputs; wireless HID; wireless human interface devices; Calibration; Capacitors; Digital filters; Matched filters; Noise; Switches; Voltage measurement;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2010 IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-5758-8
DOI :
10.1109/CICC.2010.5617595
