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 univers al filter using six BOTAs and two grounded capacitors is also introduced. T he filter's gain can be adjusted simply by varying the amplitude of a trans conductance 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 transcon ductor independent of omega(0). PSpice simulation results for the BOTA circ uit and for the universal filter are also given.