Patent ID: 8018514

Claim:
A video imaging system for deployment in a high-radiation environment, the system comprising: a. an array of photosensitive pixels, each pixel including: (i) a sense gate for integrating photogenerated charge during the course of a frame; (ii) an inject gate for removing integrated charge from the sense gate via a lateral drain; (iii) an amplifier transistor for sampling voltage on the sense gate; (iv) a select transistor for addressing a particular pixel; and (v) a reset transistor for referencing the sense gate to a specified potential, the sense gate, amplifier transistor, select transistor and reset transistor collectively constituting polysilicon layer 1 transistors, each of the polysilicon layer 1 transistors characterized by a respective threshold voltage; b. a first threshold voltage monitor for providing a first monitor output signal indicative of the threshold voltage of the polysilicon layer 1 transistors; c. a threshold compensation circuit for governing a driving voltage applied to at least one of the sense gate, amplifier transistor, select transistor and reset transistor on the basis of the first monitor output signal.