On-focal-plane signal processing for current-mode active pixel sensors (1997)
| Venue: | IEEE Transactions on Electron Devices |
| Citations: | 11 - 0 self |
BibTeX
@ARTICLE{Nakamura97on-focal-planesignal,
author = {Junichi Nakamura and Bedabrata Pain and Tetsuo Nomoto and Tsutomu Nakamura and Eric R. Fossum and Senior Member},
title = {On-focal-plane signal processing for current-mode active pixel sensors},
journal = {IEEE Transactions on Electron Devices},
year = {1997},
volume = {44},
pages = {1747--1758}
}
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Abstract
Abstract — On-focal-plane signal processing for current-mode active pixel sensors (APS), including fixed pattern noise (FPN) suppression and high-resolution analog-to-digital conversion (ADC), is presented. An FPN suppression circuit that removes the offset current variation between pixels by using a combination of an n-type and a p-type current copier cell is described. The FPN suppression circuit exhibits linear transfer characteristics in the input current range from 0 to 30 "A. On-chip ADC is expected to improve imaging system performance and reliability, while reducing system size, weight, and cost. Operation and performance of a current-mode second-order incremental 1-6 A/D converter with column parallel architecture and for highresolution and medium-slow-speed applications is presented. A 12-bit resolution with 61.5 LSB accuracy at the conversion rate of 5.6 kHz was obtained. The LSB corresponds to less than twelve signal charges of current-mode 10-"m pixel APS’s. Based on the experimental results, a brief description of a possible image sensor with the on-chip signal processing is also described. I.
