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Design and experimental evaluation of an electro-optical, sigma-delta modulator for wideband digital antennas

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Author
Gillespie, William U.
Date
2000-12
Advisor
Pace, Phillip E.
Powers, John P.
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Abstract
Electro-optical sigma-delta analog-to-digital converters (ADCs) use a pulsed laser to oversample an input signal at two Mach-Zehnder interferometer modulators. A fiber lattice accumulator is embedded within a feedback loop around a single-bit quantizer to spectrally shape the quantization noise to fall outside the signal band of interest. Applications of electro-optical sigma-delta ADCs include digitizing wideband radio frequency signals directly at an antenna (digital antenna). The design considerations, construction process and experimental evaluation of the electro-optical sigma-delta ADC are presented. The experimental results are compared with a computer model of the electro- optical sigma-delta sampling and digitization process.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
URI
http://hdl.handle.net/10945/9246
http://handle.dtic.mil/100.2/ADA386636
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  • 1. Thesis and Dissertation Collection, all items
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