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:
Jun. 15, 1993
Filed:
Mar. 04, 1991
Applicant:
Inventor:
Michael D Sidman, Colorado Springs, CO (US);
Assignee:
Digital Equipment Corporation, Maynard, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ;
U.S. Cl.
CPC ...
360 7705 ; 360 67 ; 330279 ; 307493 ;
Abstract
An automatic gain control circuit in which the gain of the gain controlled amplifier is controlled in an inverse exponential relationship with the amplitude of the output of said amplifier to provide a loop bandwidth that is essentially constant over variations in the strength of the input signals. The circuit is used in a magnetic disk drive to control amplification of detected servo signals to provide position and velocity error signals.