Patent ID: 6104020
Filing Date: 2000-08-15
Classification: G01D,H04N

Abstract:
A circuit for generating an electrical signal responsive to reception of light energy comprising:a photoelement having an amplification device and a photoreceptor, said photoelement having an emitter node and a base node, said photoreceptor being connected to generate a current at said base node in response to reception of light energy;an integration capacitor for charging upon receipt of said current;an electronic shutter mechanism coupled to said photoelement and said integration capacitor;a shutter node coupled to said shutter mechanism, said shutter node being configured to deliver a first input signal and a second input signal to said shutter mechanism;said shutter mechanism responsive to said first input signal for diverting photoelement current away from said integration capacitor and responsive to said second input signal for directing said current to said integration capacitor; anda servo for dynamically stabilizing a voltage at said photoelement base node during reception of light energy by said photoreceptor, said servo including a feedback loop from said photoelement base node to said photoelement emitter node.