Patent ID: 6208446
Filing Date: 2001-03-27
Classification: H04B

Abstract:
An optical detector system, comprising:a photo detector generating an electrical current according to light received thereby;voltage terminals at opposite sides of the photo detector for connection to a voltage source;a pair or resistors each connected between a voltage terminal and the respective side of the photo detector;a pair of matched amplifiers each having an input connected to the juncture between the respective resistor and the respective side of the photo detector, each of said matched amplifiers having an input resistance substantially less than that of the resistor to which it is connected;and an output circuit combining the outputs of said matched amplifiers, wherein said optical circuit comprises a gating circuit operated by a threshold level signal, and said gating circuit comprises:an integrator for integrating a signal corresponding to the output of the photo detector;a peak detector for detecting the peak of the combined outputs of said matched simplifiers; anda comparator having one input from said peak detector, a second input from said integrator, and an output controlled by said inputs for gating the outputs of said matched amplifiers, wherein said gating circuit further includes a gated amplifier receiving the combined outputs of said matched amplifiers and gated by the output of said comparator.