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. 20, 1996
Filed:
Mar. 31, 1994
Applicant:
Inventor:
Alexander Fairgrieve, Menlo Park, CA (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
H03F / ; H03F / ;
U.S. Cl.
CPC ...
330260 ; 330292 ;
Abstract
The input capacitance of a differential amplifier is reduced by connecting a positive feedback path between the collector of each input transistor and a terminal of a resistor connected in the other parallel current path. The positive feedback paths cause the voltage at the collector of each input transistor to move in the same direction as the voltage at the base of that input transistor, and thereby reduce the effective input capacitance seen at the input terminals of the differential amplifier.