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A digital method and apparatus for the reduction of emi radiation in digital clocked systems
A digital method and apparatus for the reduction of emi radiation in digital clocked systems
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机译:用于减少数字钟控系统中的emi辐射的数字方法和装置
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摘要
A clock reference frequency is digitally derived from a base signal, then digitally modulated by ramping the clock reference frequency up and down about a desired frequency. The modulation occurs in periodic fashion at a prescribed modulation frequency. Such modulation spreads the electromagnetic energy of the system signals over a band that is a portion of the desired clock frequency. As a result, energy in harmonics of the respective system signals also are spread. When the energy spreading of any system signal or harmonic of such signal occurs over a bandwidth greater than the 120 kHz bandwidth of conventional communication receivers, adverse EMI emissions are reduced.
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