A Doherty-type power amplifier suitable for satellite telecommunication systems provides linear amplification of noise-like RF signals that have multiple carriers spread over a large instantaneous bandwidth. Efficiencies of 40% to 50% are achieved using PHEMT devices. The power amplifier includes a carrier...http://www.google.de/patents/US5568086?utm_source=gb-gplus-sharePatent US5568086 - Linear power amplifier for high efficiency multi-carrier performance
