Electronically Tunable Current-Mode Biquad Using OTAs and Grounded Capacitors

Takao TSUKUTANI
Masami HIGASHIMURA
Yasuaki SUMI
Yutaka FUKUI

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E84-A    No.10    pp.2595-2599
Publication Date: 2001/10/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Analog Signal Processing
Keyword: 
current-mode circuit,  operational transconductance amplifier,  biquad characteristics,  continuous-time filter circuit,  

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Summary: 
This paper introduces current-mode biquad using multiple current output operational transconductance amplifiers (OTAs) and grounded capacitors. The circuit configuration is obtained from a second-order integrator loop structure with loss-less and lossy integrators. The proposed circuit can realize low-pass, band-pass, high-pass, band-stop and all-pass transfer functions by suitably choosing the input and output terminals. And the circuit characteristics can be electronically tuned through adjusting the transconductance gains of OTAs. It is also made clear that the proposed circuit has very low sensitivities with respect to the circuit active and passive elements. An example is given together with simulated results by PSpice.