Patent ID: 8437714
Filing Date: 2013-05-07
Classification: H03H

Abstract:
1. A circuit comprising: a) a power amplifier adapted to amplify a radio frequency signal and provide an amplified radio frequency signal having at least one of a first power level and a second power level; b) a first impedance matching network section coupled to the power amplifier to receive the amplified radio frequency signal; c) a first switch; d) a second switch; e) a second impedance matching network section comprising a plurality of passive components coupled between the first impedance matching network section and the first switch and adapted to receive the amplified radio frequency signal, wherein the second impedance matching network section has an output for the amplified radio frequency signal that is selectively placed in electrical communication with a load network during transmission of the amplified radio frequency signal at the first power level; f) a third impedance matching network section comprising a plurality of passive components coupled between the first impedance matching network section and the second switch and adapted to receive the amplified radio frequency signal, wherein the third impedance matching network has an output for the amplified radio frequency signal that is selectively placed in electrical communication with the load network during transmission of the amplified radio frequency signal at the second power level, and further wherein the plurality of passive components of the second impedance matching network section and the third impedance matching network section are configured such that the angles of the complex reflection coefficient for the second impedance matching network section and the third impedance matching network section are about equal and such that current consumption for the power amplifier at the first power level and the second power level is minimized; and g) a switch control system coupled to the first switch and second switch and adapted to selectively place the second impedance matching network section in electrical communication with the load network during transmission of the amplified radio frequency signal at the first power level and selectively place the third impedance matching network section in electrical communication with the load network during transmission of the amplified radio frequency signal at the second power level.