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A Time-of-Flight 3-D Image Sensor With Concentric-Photogates Demodulation Pixels.
- Source :
- IEEE Transactions on Electron Devices; Mar2014, Vol. 61 Issue 3, p870-877, 8p
- Publication Year :
- 2014
-
Abstract
- In this paper, we develop pixels with concentric-photogates for applications in time-of-flight 3-D image sensors with single-tap architecture. The pixel uses a buried-channel device and features a reduced effective electron transit length, for the rapid transfer of a signal electron. A reduction in the interpixel irregularity of signal levels and a consequent increase in the demodulation signal amplitude are observed in the single-tap operation mode as opposed to the multitap operation mode. Specifically, we are able to achieve a demodulation contrast higher than 50% from 20 MHz modulation of an 850 nm light-emitting diode illumination. Finally, we construct a sensor composed of 198\,\times\,108 concentric photogate pixels, each with a pitch of 28 \mum, and use it to generate a 3-D image conveying gross distance information and detailed object features with a distance error of less than 1% over a range of 1 to 7 m. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 00189383
- Volume :
- 61
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Electron Devices
- Publication Type :
- Academic Journal
- Accession number :
- 94655891
- Full Text :
- https://doi.org/10.1109/TED.2014.2301875