Patent ID: 6351628
Filing Date: 2002-02-26
Classification: H04B

Abstract:
An antenna switching circuit for switching signals among an antenna, an RF power amplifier, a duplex receiver and a simplex receiver, comprising:a first RF switch having a first terminal coupled to the output of the RF power amplifier; a second RF switch having a first terminal coupled to the output of the RF power amplifier; a third RF switch having a first terminal coupled to a second terminal of the second RF switch; a fourth RF switch having a first terminal coupled to the first terminal of the third RF switch and having a second terminal coupled to ground; a fifth RF switch having a first terminal coupled to a second terminal of the third RF switch, the antenna being coupled to the first terminal of the fifth RF switch; a duplexer having a duplex receiver output coupled to the duplex receiver, a second output coupled to a second terminal of the fifth RF switch and a third output coupled to a second terminal of the first RF switch; a sixth RF switch having a first terminal coupled to the antenna and a second terminal coupled to the simplex receiver; and an RF switch control circuit that controls the state of the first, second, third, fourth, fifth and sixth RF switches in accordance with a mode of operation of the antenna switching circuit.