Random spread spectrum modulation

摘要

Representative implementations of devices and techniques provide a spread spectrum clocking signal. In a frequency synthesizer, a sequence of values may be generated and used to modulate a frequency of an input signal to the frequency synthesizer.

主权项

1. An electrical circuit comprising:
a digitally controlled oscillator (DCO) arranged to generate a clocking signal; and a random number generator arranged to generate a sequence of random values, the sequence of random values arranged to modulate a frequency of the clocking signal to form a spread spectrum clocking signal; a digital loop filter, wherein the sequence of random values is injected into a signal path of the electrical circuit prior to the digital loop filter; and a second random number generator arranged to generate a second sequence of values, the second sequence of values arranged to modulate the frequency of the clocking signal to form the spread spectrum clocking signal, the second random number generator being upstream from the digital loop filter.