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Appl. Sci. 2017, 7(3), 244; doi:10.3390/app7030244

Electronically Tunable Current Controlled Current Conveyor Transconductance Amplifier-Based Mixed-Mode Biquadratic Filter with Resistorless and Grounded Capacitors

1
Department of Electronic Engineering, Ming Chi University of Technology, New Taipei 24301, Taiwan
2
Department of Computer and Communication Engineering, De Lin Institute of Technology, New Taipei 23654, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Hung-Yu Wang
Received: 22 December 2016 / Revised: 27 February 2017 / Accepted: 1 March 2017 / Published: 4 March 2017

Abstract

A new electronically tunable mixed-mode biquadratic filter with three current controlled current conveyor transconductance amplifiers (CCCCTAs) and two grounded capacitors is proposed. With current input, the filter can realise lowpass (LP), bandpass (BP), highpass (HP), bandstop (BS) and allpass (AP) responses in current mode and LP, BP and HP responses in transimpedance mode. With voltage input, the filter can realise LP, BP, HP, BS and AP responses in voltage and transadmittance modes. Other attractive features of the mixed-mode biquadratic filter are (1) the use of two grounded capacitors, which is ideal for integrated circuit implementation; (2) orthogonal control of the quality factor (Q) and resonance angular frequency (ωo) for easy electronic tenability; (3) low input impedance and high output impedance for current signals; (4) high input impedance for voltage signal; (5) avoidance of need for component-matching conditions; (6) resistorless and electronically tunable structure; (7) low active and passive sensitivities; and (8) independent control of the voltage transfer gains without affecting the parameters ωo and Q. View Full-Text
Keywords: mixed-mode circuit; analogue electronics; filters; CCCCTA; electronically tunable mixed-mode circuit; analogue electronics; filters; CCCCTA; electronically tunable
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MDPI and ACS Style

Chen, H.-P.; Yang, W.-S. Electronically Tunable Current Controlled Current Conveyor Transconductance Amplifier-Based Mixed-Mode Biquadratic Filter with Resistorless and Grounded Capacitors. Appl. Sci. 2017, 7, 244.

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