| 摘要 |
A tuner integrated circuit is connected, in a preceding stage thereof, to an RF amplifier including a UHF dual gate FET and a VHF dual gate FET. In the reception of a signal of the UHF band, a television signal output from the UHF dual gate FET is input to a UHF RF circuit via a UHF multiple-tuning circuit. In the reception of a signal of the VHF band, a television signal output from the VHF dual gate FET is input to a VHF RF circuit via a VHF multiple-tuning circuit. A VHF input terminal of the VHF RF circuit is connected to the ground via between a collector and an emitter of a transistor. In the reception of the signal of the UHF band, the transistor is turned on. |
