| 摘要 |
<p>PURPOSE: To secure the characteristic of a duplexer in the transmission/reception equipment where transmission and reception are performed in time division. CONSTITUTION: A transmission circuit 12 and a reception circuit 31 where transmission and reception are performed in time division are provided. A duplexer 22 to share an antenna 23 between transmission and reception, an output amplifier 13 of the transmission circuit 12, a matching circuit 21 for transmission for matching between the output amplifier and the duplexer 22, a matching circuit 24 for reception for matching between the duplexer 22 and an input amplifier 32 of the reception circuit 31, and a matching correction circuit 54 are provided. The output amplifier 13 is turned on in the transmission period and is turned off in the other period. The input amplifier 32 is turned on in the reception period and is turned off in the other period. In the transmission period, the matching correction circuit 54 is connected to the signal line between the duplexer 22 and a matching circuit 24 for reception.</p> |
