Method, system, apparatus, and program for measuring the...

Details Method, system, apparatus, and program for measuring the... Method, system, apparatus, and program for measuring the...

2006-10-31

2008-08-12

Chang, Joseph (Department: 2817)

Oscillators

With frequency calibration or testing

C331S017000, C324S076530, C324S076680

Reexamination Certificate

active

07411463

ABSTRACT:
A method for measuring the damping factor of an Nth-order phase-locked loop, wherein N>1, and a system, apparatus, and program that operate in accordance with the method. The method includes applying a modulation source at an input to the phase-locked loop. The method also includes measuring the output response to various levels of frequency modulation, measuring the −3 dB cutoff frequency of the phase-locked loop, and measuring the peak frequency of the phase-locked loop. The method further includes calculating the damping factor of the phase-locked loop as a function of the −3 dB cutoff frequency and the peak frequency.

REFERENCES:
patent: 5787134 (1998-07-01), Kovacs
patent: 6842056 (2005-01-01), Wong et al.
patent: 6873214 (2005-03-01), Harwood
Roland E. Best,Phase-Locked Loops: Design, Simulation, and Applications, Fifth Edition, Chapter 11, McGraw-Hill, pp. 327-340, 2003.

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