DocumentCode :
2730575
Title :
A 450 kHz CMOS Gm-C bandpass filter with /spl plusmn/0.5% center frequency accuracy for on-chip PDC IF receivers
Author :
Yamazaki, Hiroshi ; Oishi, Kazuaki ; Gotoh, Kaoru
Author_Institution :
Fujitsu Labs. Ltd., Kawasaki, Japan
fYear :
1999
fDate :
17-17 Feb. 1999
Firstpage :
392
Lastpage :
393
Abstract :
A 450 kHz Gm-C bandpass filter (BPF) with an on-chip frequency controller for Japanese personal digital cellular (PDC) handsets is implemented in 0.35 /spl mu/m CMOS technology. The controller achieves a /spl plusmn/0.58 accuracy of the center frequency without trimming or external components. This accuracy is achieved by directly measuring the center frequency through observations of the filter step response, and by digitally controlling the transconductances of operational transconductance amplifiers (OTAs). The filter is a 16th-order roll-off filter and draws 4.8 mA from a 2.5 V supply. Use of this filter enables full integration of the intermediate-frequency (IF) module of the PDC handsets on CMOS, because a discrete ceramic filter is unnecessary.
Keywords :
CMOS analogue integrated circuits; active filters; band-pass filters; cellular radio; digital radio; personal communication networks; radiofrequency filters; 0.35 micron; 2.5 V; 4.8 mA; 450 kHz; CMOS Gm-C bandpass filter; center frequency accuracy; filter step response; on-chip PDC IF receivers; operational transconductance amplifiers; personal digital cellular handsets; roll-off filter; transconductances; Automatic control; Band pass filters; CMOS technology; Digital control; Frequency measurement; Frequency response; Gain measurement; Signal generators; Transconductance; Tuning;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Solid-State Circuits Conference, 1999. Digest of Technical Papers. ISSCC. 1999 IEEE International
Conference_Location :
San Francisco, CA
ISSN :
0193-6530
Print_ISBN :
0-7803-5126-6
Type :
conf
DOI :
10.1109/ISSCC.1999.759313
Filename :
759313
Link To Document :
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