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:
Feb. 02, 1999
Filed:
Jun. 22, 1992
Rodney A Mattison, Louisville, CO (US);
Fujitsu Limited, Kanagawa, JP;
Abstract
A variable delay circuit, known as a delayed read data single shot (DRDSS) circuit, adapted for use in a data read channel which reads signals recorded with different clock frequencies in different zones on a data storage device, wherein the read channel includes a variable oscillator whose reactive impedance is supplied with a charging current whose level corresponds to the clock frequency of the zone being read. A current duplicator produces an output current that is a substantially identical duplicate of the charging current to provide an output level as a function of that output current, this output level being compared to a ramp signal, whereby a delayed version of the signal read from the data storage device is produced when the ramp signal is substantially equal to the output level. The ramp signal is generated by a ramp generator having a reactive impedance that is substantially identical to the reactive impedance of the variable oscillator, and that is charged when a signal is read from the data storage device.