Time Division Multiplexing and Time Delay Integration of Focal Plane Arrays
A scanned infrared focal plane array is composed of an array of detectors, the scanning system, and the output electronics. Each of these can vary widely with the application for which it is to be used. The output electronics have been greatly dominated by charge coupled devices. In recent years there has been a resurgence in the analog electronics field with the ever increasing need of very large scale integrated circuits. This has opened the door for complementary metal-oxide semiconductors, which have some parameters that can be controlled with the dimensions of the device. This technology is tailor-made for the needs of the output electronics or infrared focal plane arrays for a few reasons. These systems need to operate at cold temperatures, which necessitates the need for small low power devices. This technology is also well developed. This paper concerns itself with the problem of transforming the data gathered by the detectors to a visual image formed by an array of pixels. The problems of keeping the amount of electronics to a reasonable size, handling of a high rate of data flow, and keeping a high signal-to-noise ratio are all considered. This thesis presents the design, implementation and testing of one method of TOI using CMOS technology. In this paper, the use of TOI involves the integration and summation of charge over four diodes. Double sample correlation is also used to improve the signal-to-noise ratio. The goal of this thesis was met, namely the signal-to-noise ratio was significantly increased over implementations not using TOI and double sample correlation techniques. Fewer parts were used than that of staring arrays; thus, less power with a nuclear hard structure.
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Martin, Robert J.
Master of Science (M.S.)
College of Engineering
Electrical Engineering and Communication Sciences
Length of Campus-only Access
Masters Thesis (Open Access)
Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic
Prigge, Philip L., "Time Division Multiplexing and Time Delay Integration of Focal Plane Arrays" (1989). Retrospective Theses and Dissertations. 4207.