Hangup in Phase-Lock Loops

by: F Gardner

Communications, IEEE Transactions on [legacy, pre - 1988], Vol. 25, No. 10. (1977), pp. 1210-1214.

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Abstract

A phase-lock loop occasionally will take a long time to settle to equilibrium. Phase dwells at a large error for a prolonged interval. This phenomenon has been dubbed "hangup." The periodic nature of phase detectors is responsible for hangup, which occurs near the reverse-slope, unstable null. Restoring force is small in the vicinity of the reverse null, and noise causes the loop to equivocate about the null. Hangup is very troublesome when fast acquistion is needed with high reliability. One example is synchronization of digital communications. Hangups can be avoided if a large restoring force is applied for large phase errors and if equivocation is prevented. An implementation of an antihangup circuit is proposed.

@article{citeulike:2776104, abstract = {A phase-lock loop occasionally will take a long time to settle to equilibrium. Phase dwells at a large error for a prolonged interval. This phenomenon has been dubbed "hangup." The periodic nature of phase detectors is responsible for hangup, which occurs near the reverse-slope, unstable null. Restoring force is small in the vicinity of the reverse null, and noise causes the loop to equivocate about the null. Hangup is very troublesome when fast acquistion is needed with high reliability. One example is synchronization of digital communications. Hangups can be avoided if a large restoring force is applied for large phase errors and if equivocation is prevented. An implementation of an antihangup circuit is proposed.}, author = {Gardner, F. }, booktitle = {Communications, IEEE Transactions on [legacy, pre - 1988]}, citeulike-article-id = {2776104}, journal = {Communications, IEEE Transactions on [legacy, pre - 1988]}, keywords = {pll}, number = {10}, pages = {1210--1214}, posted-at = {2008-05-09 16:17:12}, priority = {2}, title = {Hangup in Phase-Lock Loops}, url = {http://ieeexplore.ieee.org/xpls/abs\_all.jsp?arnumber=1093739}, volume = {25}, year = {1977} }

RIS record

TY - JOUR ID - citeulike:2776104 TI - Hangup in Phase-Lock Loops T2 - Communications, IEEE Transactions on [legacy, pre - 1988] JF - Communications, IEEE Transactions on [legacy, pre - 1988] VL - 25 IS - 10 SP - 1210 EP - 1214 N2 - A phase-lock loop occasionally will take a long time to settle to equilibrium. Phase dwells at a large error for a prolonged interval. This phenomenon has been dubbed "hangup." The periodic nature of phase detectors is responsible for hangup, which occurs near the reverse-slope, unstable null. Restoring force is small in the vicinity of the reverse null, and noise causes the loop to equivocate about the null. Hangup is very troublesome when fast acquistion is needed with high reliability. One example is synchronization of digital communications. Hangups can be avoided if a large restoring force is applied for large phase errors and if equivocation is prevented. An implementation of an antihangup circuit is proposed. KW - pll AU - Gardner, F PY - 1977/// UR - http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=1093739 ER -

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