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Error Voltage Limiter

IP.com Disclosure Number: IPCOM000091676D
Original Publication Date: 1968-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

LaPine, AN: AUTHOR [+2]

Abstract

The phase jitter of a variable frequency oscillator in a feedback control system is reduced by an error voltage limiter installed in the sample and hold stage. The limiter is switched out during lockin time of the system when large error signal excursions can be required for fast settling times. After lockin is completed, the limiter is switched in. During steady-state operation, the error voltage makes large excursions only when an input data pulse is shifted out of position, due to noise or some other similar type of disturbance. Large error voltage excursions are clamped when they exceed the limiter's threshold voltage. Thus, the effective error voltage to the oscillator is reduced and, therefore, the total phase jitter is less.

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Error Voltage Limiter

The phase jitter of a variable frequency oscillator in a feedback control system is reduced by an error voltage limiter installed in the sample and hold stage. The limiter is switched out during lockin time of the system when large error signal excursions can be required for fast settling times. After lockin is completed, the limiter is switched in. During steady-state operation, the error voltage makes large excursions only when an input data pulse is shifted out of position, due to noise or some other similar type of disturbance. Large error voltage excursions are clamped when they exceed the limiter's threshold voltage. Thus, the effective error voltage to the oscillator is reduced and, therefore, the total phase jitter is less.

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