A circuit and method for electronically tuning an RF power amplifier. The output filter includes at least one electronically variable reactance. The electronically tuned power amplifier may be tuned rapidly to a selected frequency, to a selected impedance, or to produce a selected output amplitude. An...http://www.google.com.au/patents/US7202734?utm_source=gb-gplus-sharePatent US7202734 - Electronically tuned power amplifier
