Patent ID: 6797934
Filing Date: 2004-09-28
Classification: H04N

Abstract:
An optical transient sensor circuit disposed in a semiconductor body comprising:a feedback transistor of a first conductivity type, having a first source-drain region connected to a source of a first voltage potential, a gate and a second source-drain region; a photodiode having a first terminal connected to said second source-drain region of said feedback transistor and a second terminal connected to a source of a second voltage potential, said photodiode oriented so as to be reversed biased with respect to said sources of first and second voltage potential; an amplifier having an input connected to said first terminal of said photodiode and an output connected to an output node; a charge/discharge circuit having an input connected to said output node, a main output connected to the gate of said feedback transistor and at least one signal output for a signal indicative of transitions; a first capacitor having a first plate connected to said main output of said charge/discharge circuit and a second plate connected to a constant voltage potential.