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Publication Number: 252845 |
Rule Parts: |
Publication Date: 01/08/2008 |
Keyword: Spread Spectrum Computer Clocks |
First Category: |
Radio Service Rules |
Second Category: |
Part 15 General |
Question: Is it acceptable to use a Spread Spectrum Oscillator for a Part 15b computer product to reduce measurable energy levels?
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Answer: It is permissible to use a Spread Spectrum Clock Generator (SSCG) for a digital device. When measuring the emissions from a digital device with a SSCG, the sweep of the clock frequency as stated in Section 15.31 ( c ) does not have to be stopped. SSCG devices do not sweep, but frequency modulate within a narrow frequency range similar to the inherent jitter of non-SSCG clock generators. Since a SSCG cannot stop the sweep at a frequency, it cannot be measured in this manner because it will not operate. Allow the clock to run normally while performing CISPR Quasi-Peak Measurements just like any other digital device. |
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