Design approaches for digitally dominated active pixel sensors: leveraging Moore's Law scaling in focal plane readout design

Brian Tyrrell; Robert Berger; Curtis Colonero; Joseph Costa; Michael Kelly; Eric Ringdahl; Kenneth Schultz; James Wey

doi:10.1117/12.767272

1 February 2008 Design approaches for digitally dominated active pixel sensors: leveraging Moore's Law scaling in focal plane readout design

Brian Tyrrell, Robert Berger, Curtis Colonero, Joseph Costa, Michael Kelly, Eric Ringdahl, Kenneth Schultz, James Wey

Author Affiliations +

Proceedings Volume 6900, Quantum Sensing and Nanophotonic Devices V; 69000W (2008) https://doi.org/10.1117/12.767272
Event: Integrated Optoelectronic Devices 2008, 2008, San Jose, California, United States

Abstract

Although CMOS technology scaling has provided tremendous power and circuit density benefits for innumerable applications, focal plane array (FPA) readouts have largely been left behind due to dynamic range and signal-to-noise considerations. However, if an appropriate pixel front end can be constructed to interface with a mostly digital pixel, it is possible to develop sensor architectures for which performance scales favorably with advancing technology nodes. Although the front-end design must be optimized to interface with a particular detector, the dominant back end architecture provides considerable potential for design reuse. In this work, digitally dominated long wave infrared (LWIR) active pixel sensors with cutoff wavelengths between 9 and 14.5 μm are demonstrated. Two ROIC designs are discussed, each fabricated in a 90-nm digital CMOS process and implementing a 256 x 256 pixel array on a 30-μm pitch. In one of the implemented designs, the feasibility of implementing a 15-μm pixel pitch FPA with a 500 million electron effective well depth, less than 0.5% non-linearity in the target range and a measured NEdT of less than 50 mK at f/4 and 60 K is demonstrated. Simple on-FPA signal processing allows for a much reduced readout bandwidth requirement with these architectures. To demonstrate the potential for commonality that is offered by a digitally dominated architecture, this LWIR sensor design is compared and contrasted with other digital focal plane architectures. Opportunities and challenges for application of this approach to various detector technologies, optical wavelength ranges and systems are discussed.

Citation Download Citation

Brian Tyrrell, Robert Berger, Curtis Colonero, Joseph Costa, Michael Kelly, Eric Ringdahl, Kenneth Schultz, and James Wey "Design approaches for digitally dominated active pixel sensors: leveraging Moore's Law scaling in focal plane readout design", Proc. SPIE 6900, Quantum Sensing and Nanophotonic Devices V, 69000W (1 February 2008); https://doi.org/10.1117/12.767272

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available