Patent ID: 8188788
Filing Date: 2012-05-29
Classification: H03F

Abstract:
1. A power amplifier system, comprising: a driver amplifier having at least one first input port and at least one first output port, wherein the driver amplifier includes a plurality of sub-driver-device cells that can be individually activated or deactivated to either increase or decrease a first gain between the at least one first input port and the at least one first output port; a plurality of unit power amplifiers configured in parallel to provide a respective plurality of power amplification branches, each unit power amplifier having at least one second input port and at least one second output port, wherein each unit power amplifier includes a plurality of sub-power-device cells that can be individually activated or deactivated to either increase or reduce a respective second gain between the respective at least one second input port and the at least one second output port; a plurality of primary windings, wherein each primary winding is connected to a respective one of the plurality of power amplification branches via a respective at least one second output port; a secondary winding inductively coupled to the plurality of primary windings, wherein the secondary winding provides an overall output, wherein all of the power amplification branches remain active during operation to generate the overall output; and a switch controller, wherein the switch controller operates to activate or deactivate at least one of the plurality of sub-driver-device cells in the driver amplifier and at least one of the plurality of sub-power-device cells in each of the plurality of unit power amplifiers.