Patent ID: 6819941
Filing Date: 2004-11-16
Classification: H03G,H04B

Abstract:
A radio frequency communication system comprising:a) radiating circuitry including an antenna and having a load impedance; b) a wideband power amplifier output stage coupled to the radiating circuitry and adapted to amplify a radio frequency signal in each of a plurality of frequency bands corresponding to a plurality of operating modes; c) a variable power supply adapted to provide a selected supply voltage for supplying power to the wideband power amplifier output stage responsive to a power control signal; and d) a control system adapted to generate the power control signal based on a selected one of the plurality of operating modes such that the power delivered to the radiating circuitry for each of the plurality of operating modes from the wideband power amplifier output stage is determined by the selected supply voltage and the load impedance for the frequency band of the selected operating mode.