Optical sensing circuit including an integral capacity

Details Optical sensing circuit including an integral capacity Optical sensing circuit including an integral capacity

1991-08-27

1993-03-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307311, H01J 4014

Patent

active

051986604

ABSTRACT:
An optical sensing circuit having a photodiode, a differential amplifying circuit, and a comparator. The differential amplifying circuit is provided with an integral capacity. Adjusting capacities are connected in parallel to or disconnected from the integral capacity. A composite capacitance of the integral capacity and the adjusting capacities is adjusted by a control circuit so that the composite capacitance increases with increase of light intensity. This makes it possible to improve sensitivity of the optical sensing circuit for the light intensity and to widen the dynamic range for light sensitivity.

REFERENCES:
patent: 4165471 (1979-08-01), Ahrenkeil
patent: 4459475 (1984-07-01), Flint et al.
patent: 4743856 (1988-05-01), Keating
patent: 4789777 (1988-12-01), Takami et al.

Affiliated with

Also associated with

Rating

Optical sensing circuit including an integral capacity does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical sensing circuit including an integral capacity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical sensing circuit including an integral capacity will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1282802