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A Mixed-Mode Biquad Employing OTAs and Grounded Capacitors
Takao Tsukutani, Yasutomo Kinugasa and Noburu Yabuki
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DOI:10.17265/2328-2223/2018.03.003
This paper introduces a mixed-mode biquad employing OTAs (operational trans-conductance amplifiers) and grounded capacitors. The circuit can perform mixed-mode operation by selecting the input and output terminals. Additionally, the circuit enables low-pass, band-pass, high-pass, band-stop and all-pass transfer functions suitably choosing the input terminals. The circuit parameters ω0 and Q can be tuned orthogonally through adjusting the trans-conductance gains of the OTAs. The biquad enjoys very low sensitivities with respect to the circuit active and passive components. The achievement examples are given together with simulation results by PSPICE.
Active circuit, mixed-mode operation, biquad characteristics, OTAs.