Patent ID: 7936237
Filing Date: 2011-05-03
Classification: H01P

Abstract:
1. A transmit-receive switch having: a transmit port for the application of transmit power; an antenna port for coupling power to and from an antenna; a receive port for coupling power from said antenna port; a TxON signal indicating a transmit interval; a first switch coupling said transmit port to said antenna when said TxON is asserted; a first capacitor having one end coupled to said antenna port and the other end coupled through a second switch to ground when said TxON and a LOW_BAND signal are both asserted; a second capacitor having one end coupled to said antenna port and the other end coupled to ground through a third switch when said TxON is asserted; an inductor having one end coupled to said antenna port and the other end coupled to said receive port; a third capacitor coupled from said receive port to ground; a fourth switch coupled from said receive port to said ground when said TxON is asserted.