Sampling enhanced measurement systems Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/tq57nv57b

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  • The purpose of the thesis is to synthesize the major results of a continuous research effort directed toward new applications of high speed sampling in general and Electrooptic Sampling in particular. Equivalent time sampling of repetitive high speed signals continues to provide significant performance enhancements for present and future generations of measurement instrumentation. The Error Sampled Feedback Loop (ESFL) continues to play a major role in providing signal acquisition accuracy in the front-end of sampling oscilloscopes. Finite memory gating time effects in the ESFL and related signal distortions are analyzed and the signal to noise ratio is optimized. For over two decades state of the art sampler (harmonic mixer) has been the key component in determining performance in sampling-enhanced measurement systems. This is why improved analysis methods providing more accurate results, new circuit concepts contributing to higher performance, as well as new sampling applications are relevant and are included in this thesis. In the area of sampling time bases two new system concepts are described. These include a programmable sequential strobe generator and a predictive pseudorandom sampling time base concept. New applications of the sequential sampling technique in a phase-locked-loop based high resolution time interval measurements are also examined. This new subsystem is the heart of the new predictive pseudorandom sampling time base with potential applications in high resolution sampling oscilloscopes. The last chapter of the thesis describes the results of the research directed toward the feasibility of the first electrooptic sampling system based on a semiconductor laser.
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