Patent ID: 7061314
Filing Date: 2006-06-13
Classification: H03F,H04B

Abstract:
1. A system for operating a power amplifier in a mobile handset, comprising: a carrier amplifier having a carrier input terminal and a carrier output terminal; a peak amplifier having a peak input terminal, a peak output terminal and a control terminal for receiving a voltage control signal, the peak amplifier configured to vary at least one characteristic of the power amplifier based upon the voltage control signal; an active phase shifter, coupled to the carrier input terminal and the peak input terminal, for generating a peak amplifier input signal delayed in phase from a carrier amplifier input signal, the active phase shifter further comprising: an output matching unit, coupled to the carrier output terminal and the peak output terminal, for receiving a carrier output power signal and a peak output power signal and forming a power amplifier output power signal at a power amplifier output stage.