A new CMOS programmable balanced output transconductor and application to a mixed mode universal filter suitable for VLSI
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(0) and Q of the filter. Also, the Q of the filter can be adjusted by a single transconductor independent of omega(0). PSpice simulation results for the BOTA circuit and for the universal filter are also given.
transconductors filters