Pixel circuit with constant voltage biased photodiode and related imaging method

摘要

An imaging system includes a plurality of pixel circuits each having a photodiode, a biasing circuit and a charge-to-voltage converter. The photodiode is configured to generate charges in response to light or radiation. The biasing circuit is configured to provide a constant bias voltage across the photodiode so as to drain the charges generated by the photodiode. The charge-to-voltage converter is configured to accumulate the charges drained by the biasing circuit and convert the accumulated charges into a corresponding output voltage.

主权项

1. An imaging system having a pixel array that includes a plurality of pixel circuits, each pixel circuit comprising:
a photodiode configured to generate charges in response to light or radiation; a biasing circuit configured to provide a constant bias voltage across the photodiode so as to drain the charges generated by the photodiode; and a first charge-to-voltage converter configured to accumulate the charges drained by the biasing circuit and convert the accumulated charges into a corresponding output voltage.