| 摘要 |
<p>An AGC circuit is provided which includes a first AGC detector circuit (16) that switches whether the AGC voltage is output or not, a second AGC detector circuit (17) that always outputs the AGC voltage, a first resistor (R1) with a high impedance compared to a tuned frequency of which one end is connected to an output port of the first AGC detector circuit (16) and the other end is connected to an output port of the second AGC detector circuit (17), and a switching element (29) that is provided between the other end of the first resistor (R1) and a ground, in which an output source that outputs the AGC voltage to the amplifier can be switched to the first AGC detector circuit (16) or the second AGC detector circuit (17) by an On/Off operation of the switching element (29).</p> |
