Patent ID: 8570913

Claim:
Radio frequency (RF) circuitry comprising: control circuitry configured to select one of a plurality of operating modes, which includes a first operating mode and a second operating mode; differential RF power amplifier circuitry configured to: receive and amplify a first differential RF input signal to provide a first differential RF output signal; and receive and amplify a second differential RF input signal to provide a second differential RF output signal; and output transformer circuitry configured to receive and combine the first differential RF output signal and the second differential RF output signal to provide a first transformer output signal and a second transformer output signal, such that: during the first operating mode, the first transformer output signal is based on a combination of the first differential RF output signal and the second differential RF output signal that substantially reinforce one another, and the second transformer output signal is based on a combination of the first differential RF output signal and the second differential RF output signal that substantially cancel one another; and during the second operating mode, the first transformer output signal is based on a combination of the first differential RF output signal and the second differential RF output signal that substantially cancel one another, and the second transformer output signal is based on a combination of the first differential RF output signal and the second differential RF output signal that substantially reinforce one another.