Patent ID: 9209754
Filing Date: 2015-12-08
Classification: H03F

Abstract:
1. A device, comprising: a Doherty amplifier having a carrier path and a peaking path, the Doherty amplifier including a carrier amplifier configured to amplify a signal received from the carrier path and a peaking amplifier configured to amplify a signal received from the peaking path; an impedance inverter coupled between the carrier amplifier and a combiner node of the Doherty amplifier; a variable impedance including a first terminal coupled to an output of the Doherty amplifier and a second terminal configured to couple to a load, the variable impedance including an impedance transformer, the impedance transformer including: a controller configured to control one or more of the plurality of switches to set the variable impedance to an impedance to satisfy the expression Po/Pmax=20 log(R