Title :
Integrated selectivity for narrow-band FM IF systems
Author :
Krummenacher, F. ; Van Ruymbeke, G.
Author_Institution :
Electron. Lab., Swiss Federal Inst. of Technol., Lausanne, Switzerland
fDate :
6/1/1990 12:00:00 AM
Abstract :
An 18th-order all-pole continuous-time bandpass filter for IF (intermediate frequency) filtering purposes has been designed and integrated in a 3-μm CMOS process. Implemented using nine fully balanced, transconductor-capacitor coupled resonators, the filter features a 20-kHz bandwidth at 200-kHz center frequency and 54-dB dynamic range (IM3<-40 dB) and consumes 300 μA from a single 4-V supply. With the use of conventional phase-locked loop techniques for automatic tuning, the accuracy of the filter response is comparable to that of ceramic filters. As expected, the fundamental limitations of such an active implementation compared to a passive realization are noise and distortion
Keywords :
CMOS integrated circuits; active filters; band-pass filters; phase-locked loops; radiofrequency filters; tuning; 20 kHz; 200 kHz; 3 micron; CMOS process; active implementation; all-pole continuous-time bandpass filter; automatic tuning; center frequency; distortion; dynamic range; filter response; narrow-band FM IF systems; noise; phase-locked loop techniques; transconductor-capacitor coupled resonators; Band pass filters; Bandwidth; CMOS process; Dynamic range; Filtering; Frequency; Narrowband; Phase locked loops; Resonator filters; Tuning;
Journal_Title :
Solid-State Circuits, IEEE Journal of
