| 摘要 |
<p>A CMOS pixel cell for an image sensor that includes a photodiode and a voltage comparator working as a one-bit analog-to-digital converter is described the potential on the photodiode is compared with a reference voltage and the output is stored in a storage element. It is kept there until a selection transistor is activated to transfer the value to the data bus. The output of this cell is digital. The comparator is effectively a PMOS transistor directly built into the photodiode area where its substrate is tied to the photodiode capacitance. This device is also preferably integrated onto one chip with the storage element and the other peripheral circuit elements.</p> |
