TUNER INPUT FILTER WITH ELECTRONICALLY ADJUSTABLE CENTER FREQUENCY FOR ADAPTING TO ANTENNA CHARACTERISTIC

PROBLEM TO BE SOLVED: To provide a method of adjusting an unknown impedance at the input of an RF tuner of an RF signal receiver. SOLUTION: An electronically tunable input filter for a television channel tuner is disclosed. The filter includes: an input; an output; a first varactor diode; a second v...

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Bibliographische Detailangaben
Hauptverfasser:	RAMASWAMY KUMAR, PUGEL MICHAEL A
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 a method of adjusting an unknown impedance at the input of an RF tuner of an RF signal receiver. SOLUTION: An electronically tunable input filter for a television channel tuner is disclosed. The filter includes: an input; an output; a first varactor diode; a second varactor diode; a third varactor diode; and an electronically tunable inductor. The electronically tunable inductor operates to receive an inductor control voltage for causing a pass-band frequency bandwidth of the electronically tunable input filter to encompass an expected frequency of the television channel to be tuned. The second and third varactor diodes operate to receive a first control voltage for adjusting the pass-band frequency bandwidth of the electronically tunable input filter. COPYRIGHT: (C)2010,JPO&INPIT