Patent ID: 6362685
Filing Date: 2002-03-26
Classification: H03F

Abstract:
A power amplifier with multiple power modes for providing a desired output level comprising:an input amplifier for amplifying an input signal; a splitter network connected to the input amplifier stage for splitting the amplified input signal into splitter output signals; a plurality of switches connected to the splitter network for selecting desired splitter output signals by presenting an open circuit to ground to pass the desired splitter output signal and a short circuit to ground to reflect a splitter signal back to the splitter network; a plurality of power amplifier stages connected to the plurality of switches for amplifying the desired splitter output signals into amplified output signals; a bypass network for bypassing the plurality of power amplifier stages with a bypass signal; and a combiner network connected to the plurality of power amplifier stages and to the bypass network for combining the amplified output signals and the bypass signal to obtain the desired output power level.