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Title: Realization of current-mode KHN-equivalent biquad filter using ZC-CFTAs and grounded capacitors
Authors: Satansup, Jetsdaporn
Tangsrirat, Worapong
Keywords: Z-copy current follower transconductance amplifier
Biquad filter
Current-mode circuit
Issue Date: Dec-2011
Publisher: NISCAIR-CSIR, India
Abstract: In this paper, a current-mode Kerwin-Huelsman-Newcomb (KHN) filter structure employing four z-copy current follower transconductance amplifiers (ZC-CFTAs) and two grounded capacitors is proposed. The circuit structure has one low-impedance current input and three high-impedance current outputs and enables realizing lowpass, bandpass and highpass current responses simultaneously. The bandstop and allpass responses can also be obtained by connecting appropriate output currents directly without additional devices. The proposed filter is capable of providing an independent current-control of the natural angular frequency () and quality factor (Q) through the transconductance of the ZC-CFTA. Moreover, high-Q value filter can be realized by simply tuning the ratio of ZC-CFTA’s transconductance. To support the theoretical results, the properties of the presented filter using CMOS ZC-CFTA have been verified by simulation results.
Description: 841-846
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.49(12) [December 2011]

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