Title :
BiCMOS OTA for high Q very high frequency continuous-time bandpass filters
Author :
Minot, S. ; Degrugillier, D.
Author_Institution :
Electron. Dept., ENST de Bretagne, Brest, France
Abstract :
In this paper, we show that BiCMOS technology is really suited to the implementation of high-Q, VHF, Gm-C continuous-time bandpass filters. The major problem of such filters is the output resistance value of the transconductors which must be very high. The design approach is based on the use of a negative resistance element in BiCMOS technology which allows the output resistance value to be increased close to 50 MΩ without any limitation in the bandwidth of the transconductor circuit. Simulation results of a biquadratic bandpass filter with center frequency f0=84.6 MHz and quality factor Q 0=30 conclude the paper
Keywords :
BiCMOS analogue integrated circuits; Q-factor; VHF filters; band-pass filters; biquadratic filters; continuous time filters; negative resistance devices; operational amplifiers; 84.6 MHz; BiCMOS OTA; VHF filters; bandwidth; biquadratic bandpass filter; center frequency; continuous-time bandpass filters; high-Q filters; negative resistance element; output resistance value; quality factor; transconductor circuit; transconductors; Band pass filters; Bandwidth; BiCMOS integrated circuits; CMOS technology; Frequency; Q factor; Transconductors; Transfer functions; Tuning; VHF circuits;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.704177
