| 摘要 |
A television tuner includes a tuning circuit having two first varactor diodes for changing a tuning frequency, a mixer for converting a television signal to an intermediate frequency signal, an oscillator having a second varactor diode, and a PLL circuit for outputting a tuning voltage for tuning the television signal. The tuning voltage is applied to cathodes of the first varactor diodes and the second varactor diode, and voltages of anodes of the first varactor diodes and the second varactor diode are higher at a time of receiving the television signal whose frequency is lower than or equal to a predetermined frequency than at a time of receiving a television signal whose frequency is higher than the predetermined frequency.
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