Patent ID: 8099062

Claim:
A complementary metal oxide semiconductor (CMOS) transceiver analog front end circuit comprising: a combined transmit and receive amplifier block including: a transmit amplifier stage that receives a transmit differential signal at a first pair of nodes and produces a first stage amplified transmit differential signal at a third pair of nodes; a shared transmit/receive amplifier stage that couples between the third pair of nodes and a second pair of nodes; wherein, in transmit mode, the shared transmit/receive amplifier stage receives the first stage amplified transmit differential signal at the third pair of nodes and produces an amplified transmit differential signal at the second pair of nodes; and, wherein, in receive mode, the shared transmit/receive amplifier stage receives a receive differential signal at the second pair of nodes and produces an amplified receive differential signal at the third pair of nodes; and a first bias voltage coupled to the shared transmit/receive amplifier stage; an RF choke block coupled between the second pair of nodes and a pair of input/output nodes through which the amplified transmit differential signal and the receive differential signal couple to an antenna; a selectable power feed, responsive to a transmit/receive control signal, coupled to the RF choke block; a switched power feed, responsive to the transmit/receive control signal, coupled to the third pair of nodes.