Phase-Switched Impedance Modulation Amplifier

Abstract

Described is a phase-switched phase-switched, impedance modulation amplifier (PSIM). The PSIM has an input that can be coupled to a source and an output that can be coupled to a load. The PSIM includes one or more phase-switched reactive elements and a controller. The controller provides a control signal to each of the one or more phase-switched reactive elements. In response to one or more control signals provided thereto, each phase-switched reactive element provides a corresponding selected reactance value such that an impedance presented to an input or output port of an RF amplifier may be varied.

We claim: 
     
         1 . A radio frequency (RF) amplifier system having an input port and an output port, the RF amplifier system comprising:
 an RF amplifier having an input port coupled to the input port of the RF amplifier system and having an output port; and   a phase-switched tunable impedance network coupled between the output port of the RF amplifier and an output port of the RF amplifier system, the phase-switched tunable impedance network configured such that in response to input signal provided thereto, the phase-switched tunable impedance network varies an impedance thereof to modulate an impedance presented to the output port of the RF amplifier.