Circuit device including RF converter, tuner and if amplifier

Details Circuit device including RF converter, tuner and if amplifier Circuit device including RF converter, tuner and if amplifier

1996-01-04

1998-09-29

Peng, John K.

Television

Television transmitter circuitry

Modulator

348731, 4551961, 4551973, 4551981, 332141, H04N 540, H04N 550

Patent

active

058152180

ABSTRACT:
A circuit device provided in a video signal processing apparatus. The circuit device includes a tuner for tuning a television signal, an IF amplifier for demodulating the television signal, and an RF converter having an RF oscillator for modulating video and audio signals into a television signal in a VHF band. The tuner, IF amplifier and RF converter are accommodated in a shield case. Further, the circuit device includes a circuit including a resonance circuit having a coil and a capacitor for controlling an oscillation frequency of the RF oscillator and a switch for switching a parameter of the resonance circuit to vary the oscillation frequency.

REFERENCES:
patent: 3611154 (1971-10-01), Kupfer
patent: 4361909 (1982-11-01), Theriault
patent: 4363135 (1982-12-01), Moon
patent: 4418427 (1983-11-01), Muterspaugh
patent: 4921465 (1990-05-01), Hietala et al.
patent: 5038405 (1991-08-01), Karr
patent: 5212828 (1993-05-01), Hatashita et al.
patent: 5327582 (1994-07-01), Wong
patent: 5535443 (1996-07-01), Wignot

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