Voltage-mode multifunction biquadratic filter based on simple CMOS OTAs

Kumngern, Montree; Dejhan, Kobchai

doi:10.1109/CSPA.2009.5069242

Voltage-mode multifunction biquadratic filter based on simple CMOS OTAs

Author(s)

Kumngern, Montree

Dejhan, Kobchai

Date Issued

October 19, 2009

Type

Conference Paper

DOI

10.1109/CSPA.2009.5069242

Abstract

A voltage-mode versatile multifunction filter with four inputs and three outputs biquadratic filter based on simple CMOS operational transconductance amplifiers (OTAs) is presented. By appropriately connecting the input and output terminals, the proposed circuit can work as either a single-input multiple-output (SIMO) or a multiple-input single-output (MISO) filter without changing the circuit topology. When the circuit functions as a SIMO filter, it provides bandpass (BP), lowpass (LP) and bandstop (BS) voltage responses with grounded capacitors. When it functions as a MISO filter, the circuit can realize all the standard non-inverting and inverting second-order filter functions. The parameters ωo and Q can be set orthogonally by adjusting the circuit components. For realizing all the filter responses, no critical matching condition is required, no inverting-type input signal is imposed and all the incremental parameter sensitivities are low. The simulation results confirm the theoretical analysis. ©2009 IEEE.

Citation

Proceedings of 2009 5th International Colloquium on Signal Processing and Its Applications Cspa 2009, 317-322, 2009