Patent ID: 6374092
Filing Date: 2002-04-16
Classification: H03F,H04B

Abstract:
An efficient multimode power amplifier for a mobile communication device capable of operating in a plurality of communication modes, comprising:a carrier amplifier having a carrier input and carrier output; a peaking amplifier having a threshold control input, a peaking input; and a peaking output; splitting means for receiving an input signal and providing a first output coupled to the carrier input and a second output coupled to the peaking input, wherein the first and second output have a phase differential; phase delay means, having a phase delay and coupled between the peaking output and the carrier output, for correcting a phase difference between the peaking output and the carrier output; and threshold control means operably coupled to the threshold control input for selectively providing a control voltage to the threshold control input of the peaking amplifier, the control voltage having a voltage level that is selectively adjusted in correspondence with a choice of communication mode of the mobile communication device.