Circuit arrangement for forming the difference and the sum of tw

Details Circuit arrangement for forming the difference and the sum of tw Circuit arrangement for forming the difference and the sum of tw

1990-04-10

1991-07-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214A, H01J 4014

Patent

active

050292765

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.

REFERENCES:
patent: 4440498 (1984-04-01), Sheem
patent: 4479715 (1984-10-01), Sheem
patent: 4653917 (1987-03-01), Moeller et al.
patent: 4841138 (1989-06-01), Muro
patent: 4902884 (1990-02-01), Szabo et al.
patent: 4906836 (1990-03-01), Yamashita et al.
Optoelektronik, "Integrated Optics for Fiberoptical Sensors", by C. Wulf-Mathies, Laser and Optoelektronik 21(1)/1989, pp. 57 to 63.

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