公开(公告)号：US11657846B1

公开(公告)日：2023-05-23

申请号：US17710608

申请日：2022-03-31

Applicant: STMicroelectronics S.r.l. ,  STMicroelectronics, Inc.

Inventor： Enrico Mammei ,  Paolo Sanna ,  Dennis Hogg ,  Edoardo Contini

IPC: G11B20/10

CPC classification number: G11B20/10027

Abstract: 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.

公开(公告)号：US11756582B1

公开(公告)日：2023-09-12

申请号：US17742202

申请日：2022-05-11

Applicant: STMicroelectronics, Inc. ,  STMicroelectronics S.r.l.

Inventor： Paolo Pulici ,  Dennis Hogg ,  Michele Bartolini ,  Enrico Sentieri ,  Enrico Mammei

IPC: G11B5/60 ,  G11B21/10

CPC classification number: G11B5/6017 ,  G11B21/106

Abstract: 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.