Title :
Constant-resistance all-pass OTA-C filters
Author :
Calôba, P. ; de Queiroz, A.C.M.
Author_Institution :
Dept. of Electr. Eng., Univ. Federal do Rio de Janeiro, Brazil
Abstract :
Presents new economical and low-sensitivity all-pass sections suitable for the delay equalization of OTA-C continuous-time filters. The use of constant-resistance sections allows a delay equalizer to be inserted between an LC ladder simulation filter and one of its terminations, as done in passive realizations. An equalizer can be built as a cascade of 1st and 2nd-order sections, or directly as a single nth order section. Several canonical structures are discussed, and the gain and group-delay sensitivities for the realizations are compared
Keywords :
active filters; all-pass filters; equalisers; LC ladder simulation filter; OTA-C continuous-time filters; canonical structures; constant-resistance sections; delay equalization; delay equalizer; gain; group-delay sensitivities; low-sensitivity all-pass sections; nth order section; Active filters; Circuits; Delay; Equalizers; Frequency; Gyrators; Lattices; Passive filters; Roentgenium; Transfer functions;
Conference_Titel :
Circuits and Systems, 1990., Proceedings of the 33rd Midwest Symposium on
Conference_Location :
Calgary, Alta.
Print_ISBN :
0-7803-0081-5
DOI :
10.1109/MWSCAS.1990.140762
