Title :
Some practical problems in OTA-C filters related with parasitic capacitances
Author :
De Queiroz, Antônio C M ; Calôba, Luiz P.
Author_Institution :
COPPE, Univ. Federal do Rio de Janeiro, Brazil
Abstract :
Some effects of parasitic capacitances on operational transconductance amplifier-capacitor (OTA-C) filters are studied. In particular, it is shown that serious stability problems may occur if passive filters containing capacitor loops or inductor cutsets (structures with nonobservable poles at infinity) are simulated by OTA-C structures with all the capacitors grounded. Structures that avoid these problems are proposed for realizing the filters
Keywords :
active filters; capacitance; frequency response; poles and zeros; stability; OTA-C filters; capacitor loops; inductor cutsets; nonobservable poles; operational transconductance amplifier-capacitor; parasitic capacitances; stability; Band pass filters; Capacitors; Circuit simulation; Filtering theory; H infinity control; Inductors; Parasitic capacitance; Passive filters; Poles and zeros; Prototypes;
Conference_Titel :
Circuits and Systems, 1990., IEEE International Symposium on
Conference_Location :
New Orleans, LA
DOI :
10.1109/ISCAS.1990.112463
