Simplified pseudo-N-path cells for z to -z/sup N/ transformed SC active filters

Author

Palmisano, G. ; Montecchi, F.

Author_Institution

Dipartimento di Elettronica, Pavia Univ., Italy

Volume

36

Issue

3

fYear

1989

fDate

3/1/1989 12:00:00 AM

Firstpage

461

Lastpage

463

Abstract

Two switched-capacitor (SC) cells for simple design of bandpass active filters from reference lowpass filters are presented. The pseudo-N-path approach used is based on the z to -z/sup N/ transformation. An elliptic sixth-order symmetric bandpass filter with center frequency of 200 kHz and 0.2 dB in-band ripple within a bandwidth of 2 kHz has been designed. The basic lowpass differential topology has been derived using flowgraph techniques from a C03 to 10 21 degrees passive prototype. Presently such a filter is under integration in a 3- mu m double poly CMOS technology.<>

Keywords

active filters; band-pass filters; switched capacitor filters; 2 kHz; 200 kHz; 3 micron; SC active filters; bandpass active filters; center frequency; differential topology; double poly CMOS technology; elliptic sixth-order symmetric bandpass filter; flowgraph techniques; in-band ripple; pseudo-N-path cells; reference lowpass filters; Active filters; Band pass filters; Capacitors; Circuits; Clocks; Frequency; Low pass filters; Passband; Phased arrays; Sampling methods;

fLanguage

English

Journal_Title

Circuits and Systems, IEEE Transactions on

Publisher

ieee

ISSN

0098-4094

Type

jour

DOI

10.1109/31.17598

Filename

17598