Patent ID: 8457685

Claim:
A radio frequency (RF) circuit comprising: control circuitry adapted to select one of a plurality of modes, wherein the plurality of modes includes a first transmit mode and a first receive mode; first receive circuitry coupled to a first node, wherein the first node is coupled to a first antenna such that during the first receive mode the first receive circuitry is adapted to receive a first RF input signal having a first receive frequency; first power amplifier circuitry comprising a first final stage, wherein during the first transmit mode the first final stage provides a first RF output signal having a first transmit frequency for transmission from the first antenna; first impedance transformation circuitry coupled between an output of the first final stage and the first node comprising an impedance rotation circuit, an impedance matching circuit, and a reactance compensation circuit coupled to ground, wherein during the first receive mode the first final stage is disabled and the first final stage and the first impedance transformation circuitry present a substantially high impedance to the first node; and a first switch coupled between the output of the first final stage and the reactance compensation circuit such that the reactance compensation circuit is coupled between the first switch and ground, wherein the first switch is closed during the first receive mode and open during the first transmit mode.