Title :
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
fDate :
3/1/1989 12:00:00 AM
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;
Journal_Title :
Circuits and Systems, IEEE Transactions on
