Current measuring circuit with means for nullifying the effects

Details Current measuring circuit with means for nullifying the effects Current measuring circuit with means for nullifying the effects

1989-09-26

1991-04-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

307491, 330260, H01J 4014

Patent

active

050085239

ABSTRACT:
Current derived from an indium arsenide current generating photodetector is determined accurately, despite the presence of a variable resistance between terminals of the photodetector and the photodetector having leads with appreciable resistance connected to the detector terminals. Two leads are connected to each detector terminal. The two leads connected to one of the detector terminals are respectively connected to an inverting input terminal of an operational amplifier and to one terminal of a feedback resistor of the amplifier; the other terminal of the feedback resistor is connected to the amplifier output terminal. The two leads connected to the other terminal of the photodetector are respectively connected to the operational amplifier non-inverting input terminal and to ground. The operational amplifier derives an output voltage that accurately represents the output current of the photodetector, independently of the photodetector resistance and the lead wire resistance.

REFERENCES:
patent: Re28851 (1976-06-01), Milkovic
patent: 3962631 (1976-06-01), Poppinger
patent: 4182982 (1980-01-01), Wolf et al.
patent: 4354155 (1982-10-01), Speidel et al.
patent: 4513245 (1985-04-01), Yokoyama
patent: 4584525 (1986-04-01), Harnden, Jr. et al.
patent: 4713607 (1987-12-01), Pepper
patent: 4906834 (1990-03-01), Quad

Affiliated with

Also associated with

Rating

Current measuring circuit with means for nullifying the effects does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Current measuring circuit with means for nullifying the effects , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current measuring circuit with means for nullifying the effects will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-422873