Patent ID: 8159282

Claim:
A semiconductor integrated circuit comprising: at least one antenna switch (ANT-SW) comprising a bias generation circuit, a transmitter (Tx) switch, and a receiver (Rx) switch, wherein the Tx switch is coupled between a transmitter (Tx) port and an I/O port, an on/off state of a Tx field effect transistor of the Tx switch is controlled according to a level of a Tx control bias supplied to a Tx control port, wherein the Rx switch is coupled between the I/O port and a receiver (Rx) port, an on/off state of an Rx field effect transistor of the Rx switch is controlled according to a level of an RX control bias supplied to an Rx control port, wherein a radio frequency (RF) signal input port of the bias generation circuit is coupled to the Tx port of the Tx switch, wherein a part of a radio frequency (RF) input signal supplied to the radio frequency (RF) signal input port is rectified by the bias generation circuit so that a negative DC output bias is generated from a DC output port of the bias generation circuit, and wherein the negative DC output bias generated from the DC output port of the bias generation circuit is supplied to a gate control port of the Rx field effect transistor of the Rx switch.