A DUAL-BAND, DUAL-MODE POWER AMPLIFIER

摘要

A power amplifier circuit has a driver amplifier stage including a low band driver amplifier (412) and a high band driver amplifier (402). A final amplifier stage includes a linear mode amplifier (404) for amplifying digitally modulated signals and a saturated (nonlinear) mode amplifier (414) for amplifying frequency modulated (analog) signals. A switching network (418) interconnects the driver amplifier stage and the final amplifier stage. Depending on the desired mode of operation, an appropriate driver amplifier can be coupled to an appropriate final amplifier to most effectively and efficiently amplify analog or digital RF signals in either of a plurality of frequency bands. A diplex matching circuit (430) is coupled to the linear mode final amplifier (404) for impedance matching and for separating D-AMPS (800 MHz band) and PCS (1900 MHz band) digital signals. A power impedance matching circuit (440) is coupled to the output of the saturated mode final amplifier.