HIGH EFFICIENCY DUAL MODE POWER AMPLIFIER APPARATUS

摘要

The dual mode power amplifier apparatus of the present invention is comprised of a number of power amplifiers (101-103) coupled to a voltage convertor (104) through their collector supply lines. A mod e select line (105) is connected to the voltage convertor (104) to select a digital or analog mode. The preferred embodiment of the present invention is used in a hybrid digital/analog radiotelephone in the digital mode, the voltage convertor (104) is turned off an d the voltage convertor (104) supply voltage is allowed through to the collectors of the power amplifiers (101-103). This permit s the power amplifiers (101-103) to operate with optimum linearity in a digital transmission environment. In an analog environme nt, the voltage convertor (104) is on and supplying a reduced voltage to the power amplifiers (101-103) allowing more effi cient operation in this mode.