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:
Oct. 03, 1995
Filed:
May. 18, 1992
Applicant:
Inventor:
Ricky F Bitting, Fort Collins, CO (US);
Assignees:
AT&T Global Information Solutions Company, Dayton, OH (US);
Hyundai Electronics America, Milpitas, CA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; H03F / ;
U.S. Cl.
CPC ...
369124 ; 360 46 ; 360 67 ; 330254 ; 330252 ;
Abstract
The invention concerns differential amplifiers for computer disc drives, implemented in Metal Oxide Semiconductor (MOS) technology. The amplifiers are of the controllable-gain type. Gain is controlled by adjusting the channel current which passes through the differential Field-Effect Transistors (FETs) of the amplifier. The channel current can be viewed as having a constant component, to which is added an adjustment component. The adjustment component does not pass through the active loads of the differential amplifier, thereby allowing a larger change in gain to be attained.