Circuit and Method for Adjusting Oscillating Frequency of an Oscillator

摘要

A circuit comprises an oscillator, a frequency divider and a comparator. The oscillator generates an oscillating signal (Fvco). The frequency divider is communicatively coupled to the oscillator, divides a frequency of the oscillating signal by a denominator and generates a divided signal. The comparator is communicatively coupled to the oscillator and the frequency divider, and is configured to obtain a first count of the divided signal (Fvco/N) within a predetermined time and a second count of a reference signal within the predetermined time; compare the first count with the second count, and generate a comparison result according to the first count and the second count. The oscillator is further configured to adjust the frequency of the oscillating signal according to the comparison result.

主权项

1. A circuit comprising:
an oscillator configured to generate an oscillating signal (Fvco); a frequency divider communicatively coupled to the oscillator and configured to generate a divided signal (Fvco/N) by dividing a frequency of the oscillating signal by a denominator (N1); a comparator communicatively coupled to the oscillator and the frequency divider and configured to:
obtain a first count of the divided signal within a predetermined time and a second count of a reference signal within the predetermined time;compare the first count with the second count, andgenerate a comparison result according to the first count and the second count; wherein the oscillator is further configured to adjust the frequency of the oscillating signal according to the comparison result.