Title :
Design issues for UHF OTA-C filter realizations
Author :
Silva-Martinez, Jose
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
Design considerations for ultra-high frequency OTA-C filters are discussed. The effects of the OTA non-idealities on the precision of high-Q filters are accounted for. The parasitic capacitors produce center frequency deviations, and the finite OTA output resistance reduces the Q-factor while the parasitic poles introduce Q-enhancement. In this paper it is shown that the non-dominant pole effects are the most critical ones, hence the use of single-stage OTA´s is a must. The effects of the parasitic capacitors on the filter´s linearity are considered as well. Simulated results for a 2nd order 500 MHz high-Q bandpass filter using a 0.35 μm technology are reported
Keywords :
CMOS analogue integrated circuits; Q-factor; UHF filters; UHF integrated circuits; band-pass filters; continuous time filters; equivalent circuits; integrated circuit design; linear network synthesis; operational amplifiers; poles and zeros; 0.35 micron; 500 MHz; OTA nonidealities; Q-enhancement; Q-factor; UHF OTA-C filter realizations; active filters; center frequency deviations; filter linearity; finite OTA output resistance; high-Q bandpass filter; high-Q filter precision; nondominant pole effects; parasitic capacitors; parasitic poles; second-order bandpass filter; single-stage OTA; ultra-high frequency filters; Band pass filters; Capacitors; Electric resistance; Frequency; Harmonic distortion; Linearity; Nonlinear filters; Q factor; Transconductance; Voltage;
Conference_Titel :
Mixed-Signal Design, 2001. SSMSD. 2001 Southwest Symposium on
Conference_Location :
Austin, TX
Print_ISBN :
0-7803-6742-1
DOI :
10.1109/SSMSD.2001.914945
