Method and apparatus for isolating IIC bus noise from a...

Details Method and apparatus for isolating IIC bus noise from a... Method and apparatus for isolating IIC bus noise from a...

2007-01-16

2007-01-16

Tran, Trang (Department: 2622)

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

C348S731000, C348S725000

Reexamination Certificate

active

10030796

ABSTRACT:
A method and apparatus for isolating a noise intolerant device, e.g., a phase-lock loop of a tuner within a television receiver, from source of noise. In one embodiment, the apparatus isolates a phase-lock loop integrated circuit (IC) from the bus, by providing an isolation buffer that allows the receiver to only pass data to the tuner's phase-lock loop IC when a tune command is issued by a processor. When not being tuned, the IIC lines to the tuner are held HIGH by a buffer until needed again to perform the tuning function. This allows the demodulation circuitry to use a setting for a carrier tracking-loop that optimizes bit error rate performance.

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*Patent Abstracts of Japan, vol. 009, No. 314, Dec. 10, 1985 & JP 60-144857.

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