DocumentCode :
1119531
Title :
Programmable switched-current wave analog filters
Author :
Yufera, Alberto ; Rueda, Adoración ; Huertas, José L.
Author_Institution :
Dept. de Diseno Analogico, Seville Univ., Spain
Volume :
29
Issue :
8
fYear :
1994
fDate :
8/1/1994 12:00:00 AM
Firstpage :
927
Lastpage :
935
Abstract :
This paper presents a methodology to realize programmable switched-current filters. A universal wave filter structure is built based on a low-pass (LP) to band-pass (BP) frequency transformation in the z-domain that allows obtaining different filtering functions from a single low-pass reference filter without altering the global circuit topology. Two different parameters, modified by changing the gain of current mirrors, independently control the filter bandwidth and center frequency. A 2.88-mm2 IC prototype has been fabricated in a 1.6-μm CMOS digital technology that is capable of implementing three LP´s (and their three complementary HP´s) and nine BP´s (and their nine complementary BR) Chebyschev filters. The realization of the 24 filtering functions requires less than 15% of additional area than that required to implement only one BP function. The chip operates from a 5-V supply, dissipates 0.83 mW/pole, and met the expected performance levels for all filter functions
Keywords :
CMOS integrated circuits; active filters; linear integrated circuits; network synthesis; switched filters; 1.6 micron; 5 V; CMOS technology; Chebyschev filters; IC prototype; current mirror gain; filtering functions; low-pass to band-pass frequency transformation; programmable switched-current filters; universal wave filter structure; wave analog filters; z-domain; Band pass filters; Bandwidth; CMOS digital integrated circuits; CMOS integrated circuits; CMOS technology; Circuit topology; Filtering; Frequency; Low pass filters; Mirrors;
fLanguage :
English
Journal_Title :
Solid-State Circuits, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9200
Type :
jour
DOI :
10.1109/4.297697
Filename :
297697
Link To Document :
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