Tuning the bandwidth of a phase-locked loop

Details Tuning the bandwidth of a phase-locked loop Tuning the bandwidth of a phase-locked loop

1998-06-05

2000-04-11

Grimm, Siegried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 25, 331 44, H03L 7085

Patent

active

060492554

ABSTRACT:
A phase-locked loop bandwidth is tuned to a desired level by operating the phase-locked loop in a phase-locked condition at a first frequency and applying a step response to the phase-locked loop by causing the phase-locked loop to begin locking to a second frequency that is different from the first frequency. A parameter is then detected that is related to the applied step response and that is indicative of whether the phase-locked loop bandwidth is at the desired level. The phase-locked loop bandwidth is adjusted, and the steps of operating at the first frequency, applying the step response, detecting the parameter and adjusting the phase-locked loop bandwidth are repeated until the phase-locked loop bandwidth is at the desired level. Where the desired bandwidth level for tuning is not the operational bandwidth, the phase-locked loop bandwidth is further adjusted by a predetermined amount, thereby tuning the phase-locked loop bandwidth to an operational level. The step response may be applied by changing a frequency division value in a feedback path of the phase-locked loop. The detected parameter may be a pulse skip, which indicates that the bandwidth of the phase-locked loop is not yet at the desired bandwidth level.

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A. J. Bishop, et al. "Adaptive Phase Locked Loop for Video Signal Sampling," 1992 IEEE International Symposium on Circuits and Systems, San Diego, CA, May 10-13, 1992, vol. 4 of 6, May 10, 1992, pp. 1664-1667.
R. C. Den Dulk, "Digital PLL Lock-Detection Circuit," Electronic Letters, vol. 24, No. 14, Jul. 7, 1988, pp. 880-882.

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