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. 05, 1999
Filed:
Oct. 01, 1997
Applicant:
Inventor:
Edward M Zoladz, Jr, West Chester, PA (US);
Assignee:
Mars Incorporated, McLean, VA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K / ; H03F / ;
U.S. Cl.
CPC ...
194207 ; 330254 ;
Abstract
An optical sensor system for use in a currency validator is described. The system includes a controller, a plurality of light transmitters, a plurality of light receivers and a variable gain amplifier circuit connected to the receivers and to the microcontroller. The microcontroller controls the gain of the variable gain amplifier circuit. The variable gain amplifier circuit includes dual transconductance amplifiers connected together in such a manner to compensate for leakage current over a wide range of temperatures.