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:
Jul. 02, 1991
Filed:
Apr. 10, 1990
Applicant:
Inventors:
Assignee:
Messerschmitt-Boelkow-Blohm, Munich, DE;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
2502082 ; 2502 / ;
Abstract
A circuit arrangement for forming the difference and the sum of two detector signals has two photodetectors connected in back-to-back fashion. The difference signal is provided by a first operational amplifier connected to the junction between the two back-to-back connected photodetectors. The sum signal is formed by two further operational amplifiers, whereby one further operational amplifier inverts the signal from one detector and supplies the inverted signal to the input of the other operational amplifier. Thus, the difference signal and the summing signal are directly formed and accessible.