The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 02, 1994
Filed:
Jul. 22, 1992
Forrest C Meyer, Eden Prairie, MN (US);
Seagate Technology, Inc., Scotts Valley, CA (US);
Abstract
A peak shift detection circuit receives digitized read data and provides a temporal measurement output representative of peak shift of data pulses read from a magnetic storage medium. A random data pattern is written upon the magnetic storage medium. The peak shift detection circuit uses a precision delay circuit to delay a digitized read data signal. The delay signal is applied to a linear ramp circuit. The linear ramp circuit triggers the charging of a capacitor through a constant current source. This generates a linear ramp which is applied to a flash analog-to-digital converter. The conversion by the flash analog-to-digital is triggered by a generated data window signal. The digitized output of the flash analog-to-digital converter is applied to a time conversion circuit. The output of this circuit is a temporal measurement of the spacing between a data pulse and the following edge of a data window. This time measurement is then used to calculate the amount of write precompensation necessary to correct peak shifting.