Amplifier design for a piezoelectric transducer
N. van Klaveren (TU Delft - Electrical Engineering, Mathematics and Computer Science)
M. Vermeulen (TU Delft - Electrical Engineering, Mathematics and Computer Science)
A.J. van Genderen – Mentor (TU Delft - Computer Engineering)
A.J.M. Montagne – Mentor (TU Delft - Electronics)
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Abstract
This thesis is part of a larger graduation project aimed at achieving precise control over the displacement of an ultrasonic transducer in order to obtain a flat displacement response in the frequency domain. This thesis specifically presents a detailed report on selecting and driving a piezoelectric transducer around its resonance frequency.
By means of laser interferometry, the position of the surface of the transducer is measured. Based on design requirements, an ultrasonic transducer and an amplifier design are chosen. Using structured electronics design, design considerations such as voltage & current drive capability, noise analysis and the dynamic behaviour are investigated. Frequency compensation is implemented to enhance the stability of the designed system. To conclude, the dynamic behaviour of the design shows instabilities. Applying frequency compensation does not change the behavior of the system. The design is therefore not suitable to be implemented in a real life application and another design should be created. Also acustom made amplifier can be built for this type of application.