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Achieving Fast Sync with Minimum Transient for a Particular Phase Discriminator

IP.com Disclosure Number: IPCOM000080842D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Malone, DJ: AUTHOR

Abstract

A method of achieving fast synchronization with minimum transient employs a phase discriminator 10 in a phase-locked loop, that includes a voltage-controlled oscillator 12 and positive and negative current sources 14 and 16, respectively.

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Achieving Fast Sync with Minimum Transient for a Particular Phase Discriminator

A method of achieving fast synchronization with minimum transient employs a phase discriminator 10 in a phase-locked loop, that includes a voltage- controlled oscillator 12 and positive and negative current sources 14 and 16, respectively.

The method enables changing from a fast synchronizing mode to a slow synchronizing data separation mode in an exponential manner, by use of the voltage control 18. This exponential change, shown in FIG. 2e, solves the problem of gain change by exponentially decreasing the magnitude of positive and negative currents equally, such that suitable positive and negative ramps 20 and 22 are generated on the fast sync control line.

A particular phase discriminator that may be used to accomplish this method is illustrated in the IBM Technical Disclosure Bulletin, Vol. 14, No. 7, December 1971, page 2171.

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