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:
Sep. 16, 1986
Filed:
Sep. 13, 1985
Applicant:
Inventor:
Richard W Ulmer, Austin, TX (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
323315 ; 323908 ; 307568 ; 361 58 ;
Abstract
An MOS current limit circuit which provides current limiting protection is provided. A driver transistor of a conventional output stage is coupled to a current limiting transistor which is one transistor of a current mirror. The current limiting transistor of the current mirror has the V.sub.GS thereof accurately biased to insure a precise current limit value. When the current limiting transistor is not performing a current limiting function, the current limiting transistor is made conductive and further provides high voltage protection to the driver transistor when the driver transistor is nonconductive.