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. 25, 2001
Filed:
Oct. 31, 2000
Rudolphe Gustave Hubertus Eschauzier, Bergschenhoek, NL;
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
An electronic circuit for a Class AB output stage that has a differential input and a single ended output. A pair of clamp transistors are coupled between the bases of a pair of output transistors so that cross-over distortion is reduced and the output transistors do not completely turn off. A floating current source is employed to provide a stable quiescent current over a range of supply voltages. Also, the types and sizes of the transistors in the floating current source and the clamp transistors are matched so that any non-linear change in the operation of the clamp transistors caused by the Early effect over a range of supply voltages is automatically compensated for.