Patent ID: 7738842
Filing Date: 2010-06-15
Classification: H04B

Abstract:
1. An apparatus for protecting a receiver circuit in a Time Division Duplexing (TDD) wireless communication system, the apparatus comprising: an antenna switch for transmitting an output signal of a power amplifier to an antenna feed line and transmitting an output signal of the antenna feed line to a low noise amplifier; a status monitor for monitoring a status of the antenna switch; and a mode determiner for disabling an amplification operation of the power amplifier when a status monitoring signal output from the status monitor indicates a receive (RX) mode, wherein the antenna switch includes: a circulator for transmitting the output signal of the power amplifier to the antenna feed line and transmitting the output signal of the antenna feed line to a transmission line connecting the circulator and the low noise amplifier, a plurality of pin diodes shunted at predetermined locations of the transmission line, and a switch controller for controlling bias of the plurality of pin diodes according to a TDD control signal.