Device for reading out the charge condition of a...

Details Device for reading out the charge condition of a... Device for reading out the charge condition of a...

H - Electricity

01

L

350/40

H01L 31/12 (2006.01) H04N 3/15 (2006.01) H04N 5/335 (2006.01)

Patent

CA 1068000

ABSTRACT: A device for reading out the charge condition of a phototransistor by means of sampling pulses, for example read out of a transistor to be selected from a matrix of phototransistors, a voltage which is a measure of said charge condition being taken from the emitter of the phototransistor. In order to avoid the storage effect owing to the time constant which depends on the differential resistance of the base- emitter junction, the emitter circuit of the photo- transistor includes a current source which at the instant of sampling is switched on, whilst furthermore the emitter voltage of the phototransistor is applied to a voltage comparator circuit which supplies a voltage for switching off the current source at the instant that said emitter voltage drops below a spe- cified reference value. In the case of read-out after a dark period some charge is drained owing to the response time of electronic systems, which charge can be compensated for by simple injection means. - 35 -

241907

Affiliated with

Also associated with

Rating

Device for reading out the charge condition of a... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Device for reading out the charge condition of a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for reading out the charge condition of a... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-817793