Importance

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Abstract

A driving circuit is configured to apply a drive signal to a first terminal of a drive piezoelectric actuator having a second terminal coupled to ground. In response, the drive piezoelectric actuator controls the position of a head in a head gimbal assembly. A reference piezoelectric actuator, characterized by dimensional and electro-mechanical properties substantially matching those of the drive piezoelectric actuator, is included in the driving circuit. The driving circuit controls the reference piezoelectric actuator so that a voltage is produced across the terminals of the reference piezoelectric actuator, wherein that voltage is proportional to the charge stored in the reference piezoelectric element. That voltage is transmitted through a buffer amplifier to the drive piezoelectric actuator where it creates in it a charge equal to the charge in the reference piezoelectric actuator. In response, the drive piezoelectric actuator moves the read/write head, performing the desired positioning according to the control signal.

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First Claim