Title :
Parasitic effects in OTA-C filters with finite zeros
Author :
Caloba, Luiz P. ; Galvez-Durand, Federico ; De Queiroz, ACM
Author_Institution :
Federal Univ. of Rio de Janeiro, Brazil
Abstract :
It is noted that a considerable number of problems exist in the practical implementation of continuous time OTA-C filters: restricted linear dynamic range and frequency dependence of the OTAs´ transconductance, sensitivity to parasitic capacitances, power and area minimization, etc. The authors discuss the use of multiple input/multiple output OTAs and other possible solutions to minimize these problems. In order to show the advantages of the proposed structures, a fifth-order lowpass elliptic filter with 1-dB passband ( w<1) ripple and 34-dB stopband (w>1.2) attenuation was designed and simulated
Keywords :
CMOS integrated circuits; active filters; compensation; low-pass filters; poles and zeros; CMOS chip; MIMO OTAs; area minimization; continuous time OTA-C filters; fifth-order lowpass elliptic filter; finite zeros; frequency dependence; linear dynamic range; low sensitivity active filters; parasitic capacitances; passband ripple; stopband attenuation; transconductance; Active filters; Capacitors; Circuit simulation; Dynamic range; Frequency; Low pass filters; Parasitic capacitance; Transconductance; Transconductors; Voltage control;
Conference_Titel :
Circuits and Systems, 1991., Proceedings of the 34th Midwest Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-0620-1
DOI :
10.1109/MWSCAS.1991.251955
