A power amplifier circuit for a radio transceiver has a linear mode amplifier and a saturated (nonlinear) mode amplifier, a diplex matching circuit coupled to the linear mode amplifier for impedance matching and for separating transmitted signals in a plurality of frequency bands, a low pass matching...http://www.google.de/patents/US6091966?utm_source=gb-gplus-sharePatent US6091966 - Dual-band, dual-mode power amplifier
