Power efficient wideband noise from a narrowhand piezoelectric transducer

Abstract

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.

Notes

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Graduation Date

1989

Semester

Spring

Advisor

Martin, Robert J.

Degree

Master of Science (M.S.)

College

College of Engineering

Department

Electrical Engineering and Communication Sciences

Format

PDF

Pages

45 p.

Language

English

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

Dp0026632

Subjects

Dissertations, Academic -- Engineering; Engineering -- Dissertations, Academic

Accessibility Status

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