Title :
A compact CMOS Gm-C biquadratic cell for chopper amplifier band limiting
Author :
Dei, Michele ; Bruschi, Paolo ; Piotto, Massimo
Author_Institution :
Dipt. di Ing. dell´´Inf., Univ. di Pisa, Pisa, Italy
Abstract :
We present a compact Gm-C biquadratic cell with fully differential input/single-ended output for continuous time low pass filtering and channel bandwidth selection in integrated sensor interfaces. Transconductors with input MOSFETs operating in triode region allow the filter to operate at very low cut-off frequencies without excessive area occupation. The noise versus input range issue is originally addressed in order to provide useful design formulas. Electrical simulations successfully demonstrate the application of the filter as a cascade stage after a chopper modulated amplifier.
Keywords :
CMOS integrated circuits; MOSFET; amplifiers; choppers (circuits); low-pass filters; MOSFET; channel bandwidth selection; chopper amplifier band limiting; compact CMOS Gm-C biquadratic cell; compact Gm-C biquadratic cell; continuous time low pass filtering; fully differential input; integrated sensor interface; single-ended output; transconductors; triode region; Band pass filters; Bandwidth; Choppers; Circuits; Differential amplifiers; Filtering; Frequency; Low pass filters; Mirrors; Transconductors;
Conference_Titel :
Research in Microelectronics and Electronics, 2009. PRIME 2009. Ph.D.
Conference_Location :
Cork
Print_ISBN :
978-1-4244-3733-7
Electronic_ISBN :
978-1-4244-3734-4
DOI :
10.1109/RME.2009.5201363
