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Voltage-mode low-pass, high-pass, band-pass biquad filter using simple CMOS OTAs

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2 Author(s)
Kumngern, M. ; Telecommun. Eng. Dept., King Mongkut's Inst. of Technol. Ladkrabang, Bangkok, Thailand ; Dejhan, K.

A high input impedance electronically tunable voltage-mode biquadratic filter with single input and three outputs using four simple CMOS operational transconductance amplifiers and two grounded capacitors is proposed. The proposed filter provides low-pass, band-pass and high-pass voltage responses at a high input impedance terminal, which enables easy cascadability of the voltage circuit. Also, the parameters ωo and Q can be set orthogonally by adjusting the circuit components. For the realizing of all the filter responses, no critical matching condition is required, on inverting-type input signal is imposed and all the incremental parameter sensitivities are low. The performances of the proposed circuit are simulated with PSPICE to confirm the presented theory. The band-stop and all-pass responses can also be obtained by interconnection of relevant output voltages with summer circuits.

Published in:

Instrumentation and Measurement Technology Conference, 2009. I2MTC '09. IEEE

Date of Conference:

5-7 May 2009