| 摘要 |
A TV tuner unit is provided with a tuner section for frequency-converting an input TV signal into an intermediate frequency signal, the tuner section having a mixing circuit for frequency conversion, and an oscillation circuit for inputting a local oscillation signal to the mixing circuit; a PLL circuit section for setting a frequency of the local oscillation signal through a tuning voltage by supplying the tuning voltage to the local oscillation circuit; and a video intermediate frequency circuit section for amplifying and detecting the intermediate frequency signal and thereby outputting a video signal and an audio signal, the video intermediate frequency circuit section having at least an intermediate frequency amplification circuit, a video detection circuit, and an audio detection circuit. The mixing circuit, an oscillation transistor circuit that is part of the oscillation circuit, the PLL circuit section, the intermediate frequency amplification circuit, the video detection circuit, and the audio detection circuit are provided in a single IC.
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