Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1988-03-31
1990-05-01
LaRoche, Eugene R.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455195, 334 15, 334 45, 334 64, 343850, 343861, H04J 318, H04B 118
Patent
active
049214659
ABSTRACT:
An RF signal input circuit for a UHF tuner of a television receiver comprises a series-tuned circuit including a varactor diode and an inductance element connected in series, in the order named, between signal ground and a gate electrode of a field-effect transistor RF amplifier. The series-tuned circuit has a relatively uniform bandwidth throughout the UHF range. A capacitor connected in shunt with the gate electrode completes a "split-capacitor" configuration in which the varactor diode and the shunt capacitor form a variable impedance transformation network for making the relationship between the effective impedances of the series-tuned circuit and FET amplifier relatively uniform throughout the UHF range. The order of the varactor diode and inductance element allows a low cost adjustable capacitor comprising a grounded shield wall as one plate and a movable tab as a second plate to be connected directly across the varactor diode.
REFERENCES:
patent: 1890034 (1932-12-01), Gebhard
patent: 1984408 (1934-12-01), Giddens
patent: 4048597 (1977-09-01), Knight
patent: 4048598 (1977-09-01), Knight
patent: 4145659 (1979-03-01), Wolfram
patent: 4160964 (1979-07-01), Ishikawa et al.
patent: 4267604 (1981-05-01), Sato
patent: 4851798 (1989-07-01), Hietala et al.
A Schematic of TV-Tuner 2003 obtained from Deutsche Thomson Brandt on Oct. 12, 1987.
The Service Manual for the Panasonic Omnivision VHS Video Cassette Player, Model PV-4761/PV-4761-K, issued Sep. 1987 (see p. 1-1), pp. 2-3-40 and 2-3-42.
Hietala Alexander W.
Muterspaugh Max W.
Emanuel Peter M.
LaRoche Eugene R.
Lee Benny
RCA Licensing Corporation
Tripoli Joseph S.
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