Patent ID: 7190935

Claim:
A circuit comprising: a) a transistor network configured to receive and amplify an RF drive to provide an output signal; b) a sense transistor configured to receive the RF drive and provide a scaled output signal proportional to the output signal, the sense transistor proportional to the transistor network wherein the output signal is a factor A times the scaled output signal; c) a rectifier adapted to receive and rectify the scaled output signal to provide a rectified signal; d) an output filter adapted to filter the rectified signal to provide a DC power sense signal proportional to an output power associated with the output signal, such that amplification of the transistor network is based on the DC power sense signal; and e) wherein the transistor network and the sense transistor are formed from an array of N parallel transistors such that outputs of N−1 of the parallel transistors are coupled together to form an amplifier output providing the output signal and one of the parallel transistors forms the sense transistor providing the sealed output signal.