Abstract: The present application relates to a system, apparatus and method for feedback-controlling a sensor array. The apparatus includes an imaging sensor unit comprising: a sensor module including a plurality of photosensors: a memory module coupled to the sensor module, the memory module configured to receive a sensor output from the sensor module: a local control module coupled to the sensor module, the local control module configured to: receive a local feedback signal from the sensor module: receive a global feedback signal; and use the local feedback signal and the global feedback signal to control the memory module to store the sensor output.

Abstract: A sensor pixel detects a photon and outputs a first voltage proportional to a time of arrival of the detected photon. This voltage is converted to a multi-bit digital signal in the format of a thermometer code. A number of counter circuits, one counter circuit per bit of the multi-bit digital signal, are provided to accumulate the thermometer coded outputs. Each counter is configured to increment in response to an active logic state of the corresponding bit of the multi-bit digital signal. Accumulated count values in the counter circuits provide a timing histogram with respect to photon detection.

Abstract: A sensor pixel detects a photon and outputs a first voltage proportional to a time of arrival of the detected photon. This voltage is converted to a multi-bit digital signal in the format of a thermometer code. A number of counter circuits, one counter circuit per bit of the multi-bit digital signal, are provided to accumulate the thermometer coded outputs. Each counter is configured to increment in response to an active logic state of the corresponding bit of the multi-bit digital signal. Accumulated count values in the counter circuits provide a timing histogram with respect to photon detection.