Method and apparatus for isolating IIC bus noise from a tuner in a television receiver
AssigneeThomson Licensing
InventorsDavid Glen White, Matthew Thomas Mayer
Life of this patent
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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.
Claims5
An apparatus for isolating a noise intolerant device from a source of noise, comprising:
- a processor for producing clock and data signals and a control signal;
- and
- a digital bus that couples said clock and data signals and said control signal to a buffer,
- where, in response to said control signal, said buffer selectively couples said clock and data signals to respective clock and data inputs of said noise intolerant device such that said noise intolerant device is operatively coupled to said processor via said digital bus only when said processor is communicating with said noise intolerant device.
Dependencies are inferred from the claim text.