MICHAEL W SHEPEREK
Pilots at Long Vw Ct, Longmont, CO
License number
Colorado A5022410
Issued Date
Jul 2015
Expiration Date
Jul 2017
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
430 Long View Ct, Longmont, CO 80501
Professional information
Temperature Compensation Systems And Methods For Use With Read/Write Heads In Magnetic Storage Devices
US Patent:
7097110, Aug 29, 2006
Filed:
Dec 16, 2003
Appl. No.:
10/736661
Inventors:
Michael W. Sheperek - Longmont CO, US
Bryan E. Bloodworth - Irving TX, US
Bryan E. Bloodworth - Irving TX, US
Assignee:
Texas Instruments Incorporated - Dallas TX
International Classification:
F24F 11/53, G01J 5/00, G01K 5/00, H01C 7/06, G11B 5/03
US Classification:
236 1C, 374132, 374185, 338 8, 338 9, 360 66
Abstract:
Disclosed herein are methods and systems for sensing and controlling the temperature of a resistive element configured for use in a read/write head of a magnetic data storage device. In one embodiment, a method includes detecting a voltage across the resistive element, where the voltage varies as a function of a temperature of the resistive element. The method also includes comparing the voltage to a predetermined value to determine a variation of the voltage from the predetermined value, and then altering a power applied to the resistive element based on the variation. In this exemplary embodiment, the temperature of the resistive element is then controlled as a function of the altered applied power.
Fly Height Control For A Read/Write Head In A Hard Disk Drive
US Patent:
2005010, May 19, 2005
Filed:
Nov 17, 2003
Appl. No.:
10/715217
Inventors:
Bryan Bloodworth - Irving TX, US
Congzhong Huang - Plano TX, US
Michael Sheperek - Longmont CO, US
Jeremy Kuehlwein - Woodbury MN, US
Congzhong Huang - Plano TX, US
Michael Sheperek - Longmont CO, US
Jeremy Kuehlwein - Woodbury MN, US
Assignee:
Texas Instruments Incorporated - Dallas TX
International Classification:
G11B021/02
US Classification:
360075000
Abstract:
A fly height controller (FHC; FHC′) for controlling the fly height of a read/write head assembly () in a disk drive () is disclosed. A heat element resistor () is disposed within the read/write head assembly (). The fly height controller (FHC; FHC′) includes registers (R, W) for storing digital data words corresponding to the desired drive levels to be applied to the heat element resistor () during read and write operations. The registers (R, W) are selectively coupled to a steady-state digital-to-analog converter (DAC) (), depending upon whether a read or write operation is occurring; the output of the steady-state DAC () is applied to a voltage driver (), which in turn drives current into the heat element resistor (). Overdrive and underdrive transistors (P, N) are provided to overdrive and underdrive the input to the voltage driver () in transitions between read and write operations. An initial state register () receives a digital word indicating the desired current for the heat element resistor () when unselected; the output of the initial state register () is applied to an initial state DAC (), which drives an initial state voltage driver (). Control logic (′) controls whether the steady-state voltage driver () or initial state voltage driver () drives the heat element resistor (). The fly height controller (FHC′) may also be adapted to control the fly height of multiple read/write head assemblies () in a disk drive.
Hidid Preamp-To-Host Interface With Much Reduced I/O Lines
US Patent:
2006019, Aug 31, 2006
Filed:
Feb 28, 2005
Appl. No.:
11/069031
Inventors:
Davy Choi - Garland TX, US
Michael Sheperek - Longmont CO, US
Bryan Bloodworth - Irving TX, US
Larry Koudele - Superior CO, US
Michael Sheperek - Longmont CO, US
Bryan Bloodworth - Irving TX, US
Larry Koudele - Superior CO, US
International Classification:
G11B 5/09, G11B 5/02
US Classification:
360046000, 360067000
Abstract:
The present invention achieves technical advantages as a Preamp enabled to use different functional blocks inside the Preamp only during their own “active” modes. When a block is “inactive”, its corresponding I/O's are put into the High-impedance (Hi-Z) state so that all of the other “inactive” blocks do not affect operation of the one “active” block.