Patent · US Expired

Circuit arrangement for forming the difference and the sum of two detected signals

US5029276A · kind A · utility

14Cited by

6References

4Claims

0Family size

Assignee

Messerschmitt Bolkow Blohm GmbH · DE

Inventors

Wolfhardt Buehler · Munich, DE
Hans Poisel · Leinburg, DE
Gert Trommer · Munich, DE

Key dates

Filing date	Apr 10, 1990
Grant date	Jul 2, 1991
Priority date	—
Expiry date	Apr 10, 2010

Classification

Technology area (CPC G)Physics
CPC primaryG01C19/721
WIPO fieldMeasurement
WIPO sectorInstruments

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.