Phase locked loop with precise phase and frequency slope limiter

摘要

Phase slope is controlled in a phase locked loop wherein a phase error signal controlling a controlled oscillator has a proportional component and an integral component, by determining whether the proportional component falls within a range bounded by upper and lower limit values. The proportional component is combined with the integral component if the proportional component falls within the range to provide the phase error signal. Otherwise, the proportional component is modified to meet a phase slope requirement while leaving the integral component unmodified. The modified proportional component is combined with the unmodified integral component to provide the phase error signal.

主权项

1. A method of controlling phase slope in a phase locked loop wherein a phase error signal controlling a controlled oscillator has a proportional component and an integral component, comprising:
determining whether the proportional component falls within a range bounded by upper and lower limit values; combining the proportional component with the integral component if the proportional component falls within said range to provide said phase error signal; otherwise modifying the proportional component to meet a phase slope requirement while leaving the integral component unmodified, and combining said modified proportional component with said unmodified integral component to provide said phase error signal.