MOS technology is very attractive for achieving low-cost miniature cameras. It also permits the inclusion of the sensor with other control and processing functions on the same chip. However, this technique has never been developed to the point at which MOS sensor performance matches that of CCD cameras. The objective of this project has been to develop design techniques to achieve single chip video cameras, in unmodified CMOS processes, with improved performance (aimed to match the performance of CCD cameras) and enhanced functionality. In this thesis, following an overview of solid state image sensors, the fundamentals and basic sensor array structure suitable for CMOS implementation is presented. The pixel structure and sensor array, the sense amplifier, scan circuitry, and the output amplifier and buffer are described. Noise analysis is also presented with the main noise sources highlighted and compensation schemes proposed. Other useful on-chip techniques including auto-exposure control, gain control, and data conversion are then discussed. A successfully designed device, named ASIS-1011 which incorporates all these circuit techniques, is finally reported. This design shows that the aim of achieving good picture quality and incorporating sensors and control logic on one chip can be achieved.
| Identifer | oai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:663447 |
| Date | January 1993 |
| Creators | Wang, Guoyu |
| Publisher | University of Edinburgh |
| Source Sets | Ethos UK |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Source | http://hdl.handle.net/1842/13190 |
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