Electronic tachometer with variable bandwidth differentiator
First Claim
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1. An electronic tachometer for sensing position and velocity of a movable device comprising:
- a variable gain amplifier;
means for applying a position signal to said gain amplifier;
a first feedback loop comprising said gain amplifier, and an integrating means coupled to said gain amplifier for providing a velocity signal indicating the velocity of said device;
a second feedback loop comprising said gain amplifier, means for providing a control signal to said gain amplifier, said control signal varying with relation to variations of said velocity signal, and switching means for energizing said means for providing a control signal.
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Abstract
An electronic tachometer, for use in a disk drive system, to sense velocity of an accessing head mechanism relative to data tracks being accessed, comprises a first feedback loop comprising a variable bandwidth differentiator for receiving a position signal and providing a velocity signal; and a second feedback loop including the differentiator and means for supplying a control voltage to said differentiator in response to a variable velocity signal provided by the differentiator.
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Citations
7 Claims
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1. An electronic tachometer for sensing position and velocity of a movable device comprising:
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a variable gain amplifier; means for applying a position signal to said gain amplifier; a first feedback loop comprising said gain amplifier, and an integrating means coupled to said gain amplifier for providing a velocity signal indicating the velocity of said device; a second feedback loop comprising said gain amplifier, means for providing a control signal to said gain amplifier, said control signal varying with relation to variations of said velocity signal, and switching means for energizing said means for providing a control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification