Accurate SI filters using RGC integrators

Author

Goldenberg, M. ; Croman, R. ; Fiez, T.S.

Author_Institution

Sch. of Electr. Eng. & Comput. Sci., Washington State Univ., Pullman, WA, USA

Volume

29

Issue

11

fYear

1994

fDate

11/1/1994 12:00:00 AM

Firstpage

1388

Lastpage

1395

Abstract

The design and implementation of single-ended and fully-differential switched current (SI) biquadratic high-Q bandpass filters to meet the specifications of the dual-tone multiple-frequency (DTMF) system are presented. Both designs use the regulated-gate cascode (RGC) dynamic current mirror to obtain center frequency accuracy of 0.1% and a quality factor of 24. Compared to the equivalent switched capacitor (SC) implementation of these filters, the single-ended SI filter requires 30% less area for the same minimum-sized capacitance, power dissipation and performance

Keywords

CMOS integrated circuits; Q-factor; active filters; band-pass filters; integrating circuits; linear integrated circuits; switched filters; CMOS IC; DTMF system; RGC integrators; SI filters; biquadratic filters; center frequency accuracy; dual-tone multiple-frequency; dynamic current mirror; fully-differential type; high-Q bandpass filters; monolithic type; quality factor; regulated-gate cascode; single-ended type; switched current filters; Band pass filters; CMOS process; Circuit testing; Frequency; Mirrors; Operational amplifiers; Parasitic capacitance; Switched capacitor circuits; Switching circuits; Voltage;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.328641

Filename

328641