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

fYear

2009

fDate

12-17 July 2009

Firstpage

24

Lastpage

27

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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/RME.2009.5201363

Filename

5201363