Patent ID: 8140025

Claim:
A radio frequency (RF) transceiver front end circuit with a predefined operating frequency for connecting a transceiver to an antenna, the front end circuit comprising: an antenna port connectible to the antenna; a common transmit and receive port; a power amplifier including a power amplifier transistor having a base, a collector, and an emitter; a low noise amplifier including a low noise amplifier transistor having a base, a collector, and an emitter; a matching circuit including a power amplifier output matching segment coupled to the collector of the power amplifier transistor and the antenna port, and a low noise amplifier input matching segment coupled to the base of the low noise amplifier transistor and the antenna port, the power amplifier matching segment having shared components with the low noise amplifier segment; a power amplifier input matching network coupled to the power amplifier; a low noise amplifier output matching network coupled to the low noise amplifier; and a switching transistor selectively connecting the low noise amplifier matching network to the power amplifier input matching network.