New current-feedback amplifier-based universal biquadratic filter

Author

Liu, Shen-Iuan ; Wu, Dong-Shiuh

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan

Volume

44

Issue

4

fYear

1995

fDate

8/1/1995 12:00:00 AM

Firstpage

915

Lastpage

917

Abstract

A new universal biquadratic filter configuration using two current feedback amplifiers (CFA´s) is presented. The proposed configuration can realize the second-order lowpass, bandpass, highpass, notch and allpass filters. Both the active and passive sensitivities are no more than unity. The natural frequency ω₀ can be controlled by a grounded capacitor. The quality factor Q can also be independently controlled by a resistor. Moreover, the quality factor will be insensitive to the current tracking errors and output voltage tracking errors of the CFA´s. Experimental results that confirm the theoretical analysis are obtained. The results are useful in analog filtering applications

Keywords

Q-factor; all-pass filters; band-pass filters; biquadratic filters; feedback amplifiers; high-pass filters; low-pass filters; notch filters; allpass filters; bandpass filters; current tracking errors; current-feedback amplifier; notch filters; output voltage tracking errors; quality factor; second-order low pass filters; theoretical analysis; universal biquadratic filter; Band pass filters; Capacitors; Circuits; Feedback amplifiers; Frequency; Operational amplifiers; Passive filters; Q factor; Resistors; Voltage;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.392891

Filename

392891