INPUT CIRCUIT FOR TELEVISION POWER

PROBLEM TO BE SOLVED: To provide an input circuit for a television tuner that causes no undesired attenuation in the VHF high band and no deterioration in the performance such as NF, input sensitivity and SIN when receiving the VHF high band signal. SOLUTION: The input circuit is provided with a par...

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Bibliographische Detailangaben
Hauptverfasser:	YAMAMOTO MASAKI, FURUTA TOSHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY PICTORIAL COMMUNICATION, e.g. TELEVISION SELECTING RESONANT CIRCUITS TRANSMISSION TUNING RESONANT CIRCUITS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an input circuit for a television tuner that causes no undesired attenuation in the VHF high band and no deterioration in the performance such as NF, input sensitivity and SIN when receiving the VHF high band signal. SOLUTION: The input circuit is provided with a parallel resonance circuit 2 and an input tuning circuit 20 connected to its output. A varactor diode 4 is provided in parallel with the parallel resonance circuit 2, and a capacitance of a capacitor 2a is set so that a resonance frequency of a parallel connection circuit consisting of the parallel resonance circuit 2 and the varactor diode 4 in its nonconductive state is set to a frequency of an FM broadcast band and a resonance frequency of a parallel connection circuit consisting of the parallel resonance circuit 2 and a 2nd inductor 5 when the varactor diode 4 is in a conductive state is set to a frequency higher than a frequency band of the VHF high band.