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

Television – Image signal processing circuitry specific to television

Reexamination Certificate

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C348S720000, C348S725000, C348S731000

Reexamination Certificate

active

11525376

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, Jul. 31, 1985 (See Ref. AI).
Search Report Dated Apr. 13, 2000.

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