Input circuit of TV tuner

An input circuit of a TV tuner comprising:

• a parallel resonance circuit composed of a first capacitor and a first inductor with one end of the parallel resonance circuit being connected to an input end;
• a second capacitor with one end being connected to the other end of the parallel resonance circuit;
• an input tuning circuit connected to the other end of the second capacitor and capable of tuning in to frequencies of respective bands by being switched to a low band and a high band of VHF bands;
• and a varactor diode brought into a nonconductive state when receiving a proximity TV signal of a frequency the closest to an FM broadcasting band and brought into a conductive state when receiving other TV signals, one end of the varactor diode being connected to one end of the parallel resonance circuit, the second inductor being connected between the other end of the varactor diode and the other end of the second capacitor, a resonance frequency of a parallel connecting circuit connecting in parallel the varactor diode in a nonconductive state with a series connecting circuit of the second inductor and the second capacitor and the parallel resonance circuit being set to a frequency of the FM broadcasting band and a resonance frequency of a parallel connecting circuit connecting in parallel the second inductor in the conductive state of the varactor diode with the series connecting circuit of the second inductor and the second capacitor and the parallel resonance circuit being set to a frequency higher than the high band bandwidth.