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:
Jan. 15, 1985
Filed:
Jul. 06, 1984
Applicant:
Inventor:
William C Muellner, Lagrange Park, IL (US);
Assignee:
The Perkin-Elmer Corporation, Norwalk, CT (US);
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
364571 ; 330278 ; 328168 ;
Abstract
A variable gain amplifier with digital output is described. The amplifier is useful for but not limited to input range selection in chart recorders or other measuring instruments. To minimize the number of expensive presision resistors used in the gain selection network each selected range is approximated by switching. A software routine then adjusts the gain after digitizing to the correct value for the selected range. Both range switching and gain correction are controlled by a general purpose microprocessor which also is available for other duties in the instrument.