Patent ID: 8489035

Claim:
A radio communication transceiver, comprising: a transformer, having a primary winding and a center-tap secondary winding, wherein the primary winding has a first endpoint and a second endpoint, and the center-tap secondary winding has a first endpoint, a second endpoint, and a third endpoint; a switch, having a gate, a drain, and a source, wherein the gate receives a control signal (CS), the drain is connected to the second endpoint of the primary winding of the transformer through a coupling capacitor, and the source is grounded; a power amplifier (PA), having at least one output terminal connected to the first endpoint and the second endpoint of the center-tap secondary winding of the transformer, and providing a bias signal to the third endpoint of the center-tap secondary winding; and a low noise amplifier (LNA), having an input terminal connected to the second endpoint of the primary winding of the transformer; wherein the switch enables the radio communication transceiver to receive a signal through an antenna and transmit the signal to the LNA corresponding to a first potential of the CS, and enables the signal to be emitted by the antenna through the PA corresponding to a second potential of the CS.