Stmicroelectronics S.r.l.

Stmicroelectronics Gmbh

Dennis Hogg

Enrico Mammei

Paolo Pulici

Michele Bartolini

Edoardo Contini

Enrico Sentieri

Paolo Sanna

A system for determining a fly height includes a first head of a disk drive, a second head of the disk drive, a capacitive sensor circuit coupled to the first head and the second head, and a logic device coupled to the capacitive sensor circuit. The capacitive sensor circuit is configured to measure a first capacitance between the first head and the first disk, remove noise from the first capacitance using a second capacitance between the second head and the second disk, and based thereon determine a corrected first capacitance. The logic device is configured to determine the fly height between the first head and the first disk using the corrected first capacitance.

System and method for disk drive fly height measurement

A method to determine a relative delay between a current-overshoot signal and a write data signal for a hard disk drive preamplifier, the method including using a memory element to strobe a test current-overshoot signal with a test data signal; counting a number of strobed transitions of the test current-overshoot signal; adjusting the delay based on the number of strobed transitions; setting a phase difference between the current-overshoot signal and the write data signal according to the delay; and using the memory element to strobe the current-overshoot signal with the write data signal.

Automatic skew calibration circuit for pattern-dependent dynamic wave shaping for HDD preamplifier write

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Laguna Hills, CA, United States of America

Dennis Hogg