Patent ID: 8073400

Claim:
A front end circuit for radio frequency transceivers having a predefined operating frequency for connecting the transceivers to an antenna, the front end circuit comprising: an antenna port connectable to the antenna; a first transmit port associated with a first one of the transceivers; a first receive port associated with the first one of the transceivers; a shared transmit and receive port associated with a second one of the transceivers; a first power amplifier including a first power amplifier transistor having a base coupled to the first transmit port, a collector, and an emitter; a second power amplifier including a second power amplifier transistor having a base coupled to the shared transmit and receive port, a collector and an emitter; a first low noise amplifier including a first cascode transistor having a base, a collector, and an emitter; a second low noise amplifier including a second cascode transistor having a base, a collector, and an emitter; a low noise amplifier transistor having a base, an emitter, and a collector coupled to the emitter of the first cascode transistor and the emitter of the second cascode transistor; and a matching circuit including a power amplifier output matching segment coupled to the collector of the first power amplifier transistor and the collector of the second power amplifier transistor, and a low noise amplifier input matching segment coupled to the base of the low noise amplifier transistor, the power amplifier output matching segment having shared components with the low noise amplifier input matching segment.