Patent ID: 7598805

Claim:
A balanced power amplifier for driving a load, the balanced power amplifier comprising: an input coupler device configured to generate a first signal component and a second signal component from an input signal, the first signal component and the second signal component being out of phase by ninety degrees relative to one another; a first amplifier device for a first branch of the balanced power amplifier, the first amplifier device comprising a first input node, and the first amplifier device being configured to generate a first output signal that is influenced by the first signal component; a second amplifier device for a second branch of the balanced power amplifier, the second amplifier device being configured to generate a second output signal that is influenced by the second signal component; a level adjustment component coupled between the input coupler device and the first input node, the level adjustment component being configured to perform signal level tuning on its input signal; and a control architecture coupled to the level adjustment component, the control architecture being configured to control operation of the level adjustment component in response to impedance characteristics of the load, and the control architecture comprising a gain detection circuit configured to detect gain characteristics of the first amplifier device.