| 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.
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