Power efficient wideband noise from a narrowhand piezoelectric transducer
Piezoelectric transducers are well suited for generating sounds under water, but their large electrical Q prevents a single transducer from covering a wide range of frequencies. This paper will present a concept and a test circuit for producing signals over a wideband from a narrowband acoustic transducer. The concept called power factor tuning consists of an oscillator and a bank of switched capacitors. The capacitors can be electronically switched, via power MOSFETs, to alter the oscillator's resonant frequency. This technique is shown to allow for power efficient operation over a wide band of frequencies. Wideband noise is produced by switching the frequency of oscillation according to a pseudo-random bit sequence generator. This produces noise by shifting the frequency of oscillation on every cycle of the waveform. The circuit is tested for its efficiency and noise power spectrum.
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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
Carpenter, Darren P., "Power efficient wideband noise from a narrowhand piezoelectric transducer" (1989). Retrospective Theses and Dissertations. 4111.