Intermediate-frequency coupled-circuit for television tuner

Details Intermediate-frequency coupled-circuit for television tuner Intermediate-frequency coupled-circuit for television tuner

2005-07-12

2005-07-12

Hsia, Sherrie (Department: 2614)

Television

Receiver circuitry

Tuning

C348S733000

Reexamination Certificate

active

06917390

ABSTRACT:
An intermediate-frequency (IF) coupled-circuit for a television tuner is provided, which is connected between an IF amplifying stage and a video-signal-selection filter, and which comprises a parallel circuit having a second capacitor connected in parallel to a series circuit having a resistor for impedance matching, an inductor, and a first capacitor which are connected in series, wherein the series circuit resonates at the frequency component of the selected channel, and the parallel circuit resonates at the frequency component of the channel lower than and adjacent to the selected channel, thereby functioning as a trap for removing the frequency component of the channel lower than and adjacent to the selected channel.

REFERENCES:
patent: 4271433 (1981-06-01), Theriault
patent: 4835608 (1989-05-01), Lachiw et al.
patent: 35 14 678 (1986-10-01), None
patent: 0 933 932 (1999-08-01), None
patent: 5-048989 (1993-02-01), None
patent: 2000-152107 (2000-05-01), None

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