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Automatic Delay Digital Analog Converter

IP.com Disclosure Number: IPCOM000118688D
Original Publication Date: 1997-May-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Andoh, H: AUTHOR

Abstract

Disclosed is a method to suppress servo oscillation from happening automatically. When servo detects the sign of oscillation, it delays its output step by step until the phase reverses to suppress servo oscillation.

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Automatic Delay Digital Analog Converter

      Disclosed is a method to suppress servo oscillation from
happening automatically.  When servo detects the sign of oscillation,
it delays its output step by step until the phase reverses to
suppress servo oscillation.

      The servo always monitors (Fig. 2 (1)) the position and
velocity (delta position from previous servo) to detect a sign of
oscillation.  If the result expires (Fig. 2 (2)) the criteria of
oscillation, the servo starts to delay its output by N step (Fig. 2
(3)) until the phase reverses (Fig. 1) due to avoid sudden change of
servo characteristic, then delay the constant timing to keep phase
reverse (Fig. 2 (4)).  Servo continues this operation until the
oscillation settles down within the criteria.

This method can adapt any oscillation frequency by changing N step.