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Universal filter and its oscillator modification employing only active components
Author(s)
Date Issued
January 1, 2009
Type
Conference Paper
Abstract
An active-only devices current-mode universal fIlter using the biquadratic transfer function is proposed. The proposed circuit is realized based on minimized active-only components count without external passive elements. The electronic resistors are used instead of 2 OTAs. The different kinds of fIlter function such as lowpass, highpass, bandpass and band-reject response can be obtained without changing circuit topology. A quadrature oscillator can also be easily modifIed without changing circuit topology. The proposed circuit is realized by using 4 MOS transistors, 3 OTAs, and 2 Opamps. The parameters ~ and Qp can be electronically tuned independently through adjusting the transconductance gains of the OTAs. The simulation results are given by PSpic.
Citation
2008 International Symposium on Intelligent Signal Processing and Communication Systems Ispacs 2008, 2009