Fast bias for power amplifier gating in a TDMA application

摘要

RF amplifier bias system for TDMA application. A bias circuit ( 200 ) is coupled to an RF power amplifier ( 201 ) circuit. The bias circuit includes a charge pump/sink circuit ( 215 ), a voltage reference circuit ( 204 ) and voltage scaling circuit ( 208, 210, 214 ). The bias system provides fast response time when transitioning between various bias voltages applied to an FET RF transistor ( 244 ).