Patent ID: 8135355
Filing Date: 2012-03-13
Classification: H03H,H04B

Abstract:
1. A front end circuit for coupling an antenna to a radio frequency (RF) transceiver including a transmit line, a receive line, a first enable line, and a second enable line, the front end comprising: an antenna port; a power amplifier with a signal output, a signal input coupled to the transmit line of the transceiver and a first control circuit coupled to the first enable line of the transceiver, a first voltage applied to the first control circuit activating and setting a bias point of the power amplifier; a low noise amplifier with a signal input, a signal output coupled to the receive line of the transceiver and a second control circuit coupled to the second enable line of the transceiver, a second voltage applied to the second control circuit activating and setting a bias point of the low noise amplifier; a matching network coupled to the antenna port, the signal output of the power amplifier and the signal input of the low noise amplifier, the signal output of the power amplifier and the signal input of the low noise amplifier being common; and a parallel resonant circuit connected between the low noise amplifier and the power amplifier.