Television tuner having level of harmonics of oscillation...

Details Television tuner having level of harmonics of oscillation... Television tuner having level of harmonics of oscillation...

2006-10-31

2006-10-31

Yenke, Brian P. (Department: 2622)

Television

Receiver circuitry

Tuning

C348S087000, C348S607000, C348S725000, C348S730000, C348S733000, C455S300000, C455S301000, C455S310000, C455S311000, C455S317000, C455S333000, C361S764000, C334S085000

Reexamination Certificate

active

07129994

ABSTRACT:
The level of the harmonics of oscillation signals for synchronous detection to be inputted to a mixer circuit for converting frequencies is suppressed low. A first integrated circuit component formed with a first mixer circuit for converting frequencies; a second integrated circuit component formed with a second mixer circuit for synchronously detecting intermediate frequency signals and an oscillator transistor circuit; a resonant circuit coupled to the oscillator transistor circuit and forming an oscillator circuit for synchronous detection; an intermediate frequency tuning circuit interposed between the first mixer circuit and the second mixer circuit; and a circuit board for mounting the first integrated circuit component, the second integrated circuit component the intermediate frequency tuning circuit and the resonant circuit in a predetermined block area are provided, wherein the resonant circuit is mounted on the side opposite to the side where the first integrated circuit component and the intermediate frequency tuning circuit are mounted as the second integrated circuit component is sandwiched.

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