A 150 Msample/s 20 mW BiCMOS switched-capacitor biquad using precise gain op amps

Author

Baschirotto, A. ; Montecchi, F. ; Castello, R.

Author_Institution

Dipartimento di Elettronica, Pavia Univ., Italy

fYear

1995

fDate

15-17 Feb. 1995

Firstpage

212

Lastpage

213

Abstract

This paper presents a design approach to realize high-frequency IIR SC filters. The trade-off between speed-and-gain in the design of the op amps is overcome by designing a simple and compact amplifier with a limited but precisely controlled gain. The finite gain effect is taken into account in the filter design by adjusting the capacitor ratio. In addition the filter uses nMOS-only switches therefore requiring a standard two-phase clock. Finally the clock-to-bandwidth ratio is equal to 10, so a fairly non-critical anti-aliasing filter is needed.

Keywords

BiCMOS analogue integrated circuits; IIR filters; antialiasing; biquadratic filters; operational amplifiers; switched capacitor filters; 20 mW; BiCMOS; IIR SC filters; anti-aliasing filter; capacitor ratio; clock-to-bandwidth ratio; finite gain effect; nMOS-only switches; opamps; precisely controlled gain; switched-capacitor biquad; two-phase clock; BiCMOS integrated circuits; Capacitors; Clocks; Frequency; IIR filters; Impedance; Low voltage; Resistors; Sampling methods; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Circuits Conference, 1995. Digest of Technical Papers. 41st ISSCC, 1995 IEEE International

Conference_Location

San Francisco, CA, USA

ISSN

0193-6530

Print_ISBN

0-7803-2495-1

Type

conf

DOI

10.1109/ISSCC.1995.535527

Filename

535527