| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an antenna inspection circuit that can surely inspect a connection state when an antenna in which DC impedance from a power feeding point to a ground point is equal to 0Ωis connected.SOLUTION: An antenna inspection circuit has an antenna connection input terminal 1, an inspection request input terminal 2, an inspection result output terminal 3, a switching element 7 having a control terminal 7a connected to the inspection request input terminal 2, an input terminal 7b connected to the antenna connection input terminal 1, and an output terminal 7c connected to the inspection result output terminal 3, and a first resistor 11 connected between the inspection request input terminal 2 and the inspection result output terminal 3. The DC impedance of the antenna 51 from a power feeding point to a ground point is equal to 0Ω. In a case where a high-level inspection request signal is applied to the inspection request input terminal 2, the switching element 7 is switched on when the antenna 51 is connected, and the switching element 7 is switched off when the antenna 51 is not connected, whereby each of different inspection result signals is output to the inspection result output terminal 3.</p> |
