An active RC filter capable of easy lowpass-highpass transformation

Author

Fujii, Nobuo ; Mitra, Sanjit K.

Author_Institution

Tokyo Inst. of Technol., Japan

fYear

1988

fDate

7-9 June 1988

Firstpage

2403

Abstract

An RC active filter, whose transfer characteristics can easily be changed from a given lowpass to its highpass form only by interchanging one capacitor and one resistor regardless of the order of the filter, is proposed. The transfer function realizable by this method are limited to odd-order Butterworth and a class of elliptic functions which have their poles on a circle in the complex s-plane. A novel all-pass active RC structure, which has the transfer level of 1.0 independent of the quality factor of the transfer function and is quite suitable for the proposed realization, is also given. The experimental results on the fifth-order Butterworth filter show quite good agreement with theory.<>

Keywords

active filters; high-pass filters; linear network synthesis; low-pass filters; lumped parameter networks; transfer functions; active RC filter; elliptic functions; fifth-order Butterworth filter; lowpass-highpass transformation; odd-order Butterworth function; transfer characteristics; Active filters; Adders; Capacitors; Chebyshev approximation; Circuit stability; Circuit synthesis; Frequency; Inductors; Resistors; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1988., IEEE International Symposium on

Conference_Location

Espoo, Finland

Type

conf

DOI

10.1109/ISCAS.1988.15427

Filename

15427