Image trap filter circuit

Details Image trap filter circuit Image trap filter circuit

1988-05-31

1989-05-30

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455340, 455197, H04N 550

Patent

active

048356085

ABSTRACT:
A varactor diode tuner includes a tunable image frequency trap in its input circuit. The trap is part of a tunable bandpass filter and forms a tapped capacitance matching network for UHF television signal carrier frequencies and a low impedance shunt at image frequencies. The trap is formed of discrete capacitors, an inductor and a tunable varactor diode.

REFERENCES:
patent: 3562417 (1971-02-01), Poppa
patent: 4204166 (1980-05-01), Araki
patent: 4361909 (1982-11-01), Theriault
patent: 4368541 (1983-01-01), Evans
patent: 4399559 (1983-08-01), Theriault
patent: 4601062 (1986-07-01), Hettiger
patent: 4662001 (1987-04-01), Cruz et al.
patent: 4760535 (1988-07-01), Englmeier
patent: 4771332 (1988-09-01), Metoki

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