Fred Garber (Committee Member), Andrew Hsu (Other), Marian Kazimierczuk (Advisor), Raymond Siferd (Committee Member), Kefu Xue (Other)
Master of Science in Engineering (MSEgr)
Analog magnetic tape remains a medium of choice for high-fidelity sound recording and reproduction. Some of this fidelity is sacrificed during the tape playback process; an optimized playback preamplifier is therefore critical to the performance of the medium. Existing playback methods integrate the voltage generated across the reproduce head to obtain a signal directly proportional to the remanent magnetic flux of the tape. An alternate playback method proposes the use of a transresistance amplifier to convert flux-proportional reproduce head current directly to voltage. This eliminates the need for voltage integration and minimizes the amount of equalization performed upon playback. Circuit size and complexity are likewise reduced. A practical transresistance playback preamplifier is designed and its performance is evaluated against selected integrating playback preamplifiers. SPICE simulation verifies that the proposed design offers a significant reduction in harmonic distortion, as well as improved transient response, magnitude response, and phase margin.
Department or Program
Department of Electrical Engineering
Year Degree Awarded
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