| abstract |
A photon-counting Geiger-mode avalanche photodiode intensity imaging array includes an array of pixels ( 200 ), each having an avalanche photodiode ( 250 ). A pixel senses an avalanche event and stores, in response to the sensed avalanche event, a single bit digital value therein. An array of accumulators ( 320 ) are provided such that each accumulator is associated with a pixel. A row decoder circuit ( 310 ) addresses a pixel row within the array of pixels. A bit sensing circuit ( 300 ) converts a precharged capacitance into a digital value during read operations. |