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Active-pixel sensor

An image sensor where each pixel sensor unit cell has a photodetector (typically a pinned photodiode) and one or more active transistors.
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An active-pixel sensor (APS) is an image sensor where each pixel sensor unit cell has a photodetector (typically a pinned photodiode) and one or more active transistors. In a metal–oxide–semiconductor (MOS) active-pixel sensor, MOS field-effect transistors (MOSFETs) are used as amplifiers. There are different types of APS, including the early NMOS APS and the much more common complementary MOS (CMOS) APS, also known as the CMOS sensor, which is widely used in digital camera technologies such as cell phone cameras, web cameras, most modern digital pocket cameras, most digital single-lens reflex cameras (DSLRs), and mirrorless interchangeable-lens cameras (MILCs). CMOS sensors emerged as an alternative to charge-coupled device (CCD) image sensors and eventually outsold them by the mid-2000s.

The term 'active pixel sensor' is also used to refer to the individual pixel sensor itself, as opposed to the image sensor. In this case, the image sensor is sometimes called an active pixel sensor imager, or active-pixel image sensor.

Key Terms

active pixel sensor
active transistors
aps
definition
image sensor
metal oxide semiconductor
photodetector
pinned photodiode
pixel sensor unit cell
usage

Additional Resources

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Acronymn

APS

Synonymns

Active-pixel sensor
(none found)

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Sources & Credits

Last modified on June 4 2020
Content adapted from Wikipedia
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