Patent ID: 8946640
Filing Date: 2015-02-03
Classification: G01J,H04N

Abstract:
1. A unit cell of a focal plane array, the unit cell comprising: a detector comprising an avalanche photodiode adapted to provide a detector signal in response to infrared light received by the detector; a first capacitor adapted to store a bias voltage while additional bias voltages are loaded into other unit cells of the focal plane array; a first switch adapted to connect the first capacitor to an input line to provide the bias voltage from the input line to the first capacitor and disconnect the first capacitor from the input line after the bias voltage is provided; a second capacitor adapted to store the bias voltage during at least one integration period of the focal plane array; a second switch adapted to provide the bias voltage from the first capacitor to the second capacitor prior to the at least one integration period; and an output node adapted to store an output voltage that changes in response to the detector signal and the bias voltage stored by the second capacitor.