Phase-locked loop with loop gain calibration, gain measurement method, gain calibration method and jitter measurement method for phase-locked loop

摘要

The invention provides a phase-locked loop with loop gain calibration and methods for measuring an oscillator gain, gain calibration and jitter measurement for a phase-locked loop. The method for measuring an oscillator gain of a phase-locked loop includes the steps of providing a varying code at an input end of the oscillator; outputting excess reference phase information by a reference phase integral path and outputting excess feedback phase information based on the varying code by a feedback phase integral path; and obtaining an estimated gain information of the oscillator based on the excess reference phase information and the excess feedback phase information.

主权项

1. A method for measuring an oscillator gain of a phase-locked loop (PLL), in which the PLL includes a feedback phase integral path with a loop filter, an oscillator, and a counter, a reference phase integral path with a delta-sigma modulator and an accumulator, and a phase quantizer for comparing outputs of the feedback phase integral path and the reference phase integral path, the method comprising the following steps of:
(1) providing a varying code at an input end of the oscillator; (2) outputting excess reference phase information by the reference phase integral path and outputting excess feedback phase information based on the varying code by the feedback phase integral path; and (3) obtaining an estimated gain information of the oscillator based on the excess reference phase information and the excess feedback phase information.