A New CMOS Programmable Balanced Output Transconductor and Application to a Mixed Mode Universal Filter Suitable for VLSI

Abstract

A new CMOS programmable balanced output transconductor (BOTA) is introduced. The BOTA is a useful block for continuous-time analog signal processing. A new CMOS realization based on MOS transistors operating in the saturation region is given. Application of the BOTA in realizing a mixed mode universal filter using six BOTAs and two grounded capacitors is also introduced. The filter’s gain can be adjusted simply by varying the amplitude of a transconductance through its control voltage without affecting \omega_{\rm 0} and Q of the filter. Also, the Q of the filter can be adjusted by a single transconductor independent of \omega_{\rm 0}. PSpice simulation results for the BOTA circuit and for the universal filter are also given.