System and method for suppressing noise in a phase-locked loop circuit
A phase-locked loop and noise technology, applied in the field of frequency signals, can solve problems such as inability to remove the loop filter, reduce the signal quality and performance of the host system, etc.
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[0031] The present invention includes various embodiments of systems and methods for suppressing noise in phase locked loop circuits. According to one embodiment, the systems and methods suppress noise generated by mismatches associated with charge pumps and phase and frequency detectors. This is accomplished using a sigma-delta modulator that controls a frequency divider in the feedback path of the PLL such that spurious noise components are shifted out of the operating loop bandwidth of the circuit. Other embodiments suppress noise by modulating the reference frequency signal input to the phase and frequency detector. Other embodiments use a combination of the above techniques to suppress noise. With these embodiments, the spurious noise components are kept away from the desired output frequency of the PLL so that they can be removed by the loop filter. As a result, substantial improvements in signal-to-noise ratio and loop bandwidth and proportional reductions in phase no...
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