Transmission circuit and radio communication apparatus

摘要

In a transmission circuit used in a TDD scheme, a preset current is supplied from a current source to a detection diode via a switch that is made conductive during a reception period and made non-conductive during a transmission period. A determination is made if the output of the detection diode is within a predetermined specified range and, if the output is out of the specified range, a judgment is made that the detection diode is faulty.

主权项

1. A radio communication apparatus employing a time division duplex (TDD) scheme and in which data is transmitted and received simultaneously by switching between a transmission signal and a reception signal, comprising:
a detector that detects a signal branched from said transmission signal transmitted during a transmission period of the TDD scheme; a generator that generates a test signal which is used for testing the detector; and a switch that supplies said test signal to the detector during a reception period of the TDD scheme, wherein: the detector comprises a diode that is tested by the test signal; and the test signal is a preset direct current for testing the diode, wherein a decision is made whether the diode is faulty or not by outputting of the preset direct current to the diode and monitoring whether an output of the diode is within a specified range or not.