| 摘要 |
In a television tuner, a predetermined bias voltage is applied to the anode of a first switching diode. A power supply voltage is applied to the collector of a switching transistor via a power supply resistor, and the emitter of the switching transistor is grounded. The collector of the switching transistor is connected to an input terminal of a first FET via a first resistor. The first switching diode and the switching transistor are both switched on or off correspondingly to whether a television signal in the UHF band is to be received or a television signal in the VHF band is to be received.
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