Disk drive estimating fly height using a PLL tuned by a fly...

Details Disk drive estimating fly height using a PLL tuned by a fly... Disk drive estimating fly height using a PLL tuned by a fly...

2009-01-21

2010-06-01

Tzeng, Fred (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

Reexamination Certificate

active

07729079

ABSTRACT:
A disk drive is disclosed comprising a disk, a head actuated over the disk, and control circuitry operable to estimate a fly height of the head by tuning a phase locked loop (PLL) in response to a fly height capacitance. In one embodiment, the PLL comprises a resistive component having a second terminal coupled to the fly height capacitance, a variable oscillator operable to generate a first oscillating signal applied to a first terminal of the resistive component to generate a second oscillating signal at the second end of the resistive component, and a phase detector operable to generate a control signal by comparing a phase of the first oscillating signal to a phase of the second oscillating signal. The control signal is applied to the variable oscillator to adjust a frequency of the first oscillating signal.

REFERENCES:
patent: 5311287 (1994-05-01), Amer
patent: 5831733 (1998-11-01), de Groot
patent: 5862157 (1999-01-01), Bessios
patent: 5918001 (1999-06-01), Ueno et al.
patent: 6008640 (1999-12-01), Tan et al.
patent: 6967670 (2005-11-01), Berner et al.
patent: 7164555 (2007-01-01), Kato et al.
patent: 7199960 (2007-04-01), Schreck et al.
patent: 7224553 (2007-05-01), Sasaki et al.
patent: 7394611 (2008-07-01), Rahgozar
patent: 7542223 (2009-06-01), Hashimoto et al.
patent: 2006/0126476 (2006-06-01), Lacey
patent: 2008/0158715 (2008-07-01), Hirano et al.
patent: 2008/0170316 (2008-07-01), Kim
patent: 2008/0198497 (2008-08-01), Lee et al.

Affiliated with

Also associated with

Rating

Disk drive estimating fly height using a PLL tuned by a fly... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disk drive estimating fly height using a PLL tuned by a fly..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disk drive estimating fly height using a PLL tuned by a fly... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4149721