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2007, 15

Fréderic Coutard, Etienne Tisserand, Patrick Schweitzer

Optimal low noise amplifier for ultrasonic receptor

language: English

received 12.06.2007, published 01.08.2007

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ABSTRACT

The paper describes a detailed investigation of the noise generated by an ultrasonic chain of reception carried out on a piezoelectric receiver of standard characteristics amplified by an LNA (Low Noise Amplifier) of optimum design. The objective is to provide the conditions which will allow the best signal-to-noise ratio of the entire chain. The noise chain factor is studied theoretically. It is shown that the noise factor is minimal if the noise characteristics of the LNA and the gain resistance of the first amplification stage are jointly matched to the transducer’s internal resistance. A two-stage 56 dB amplifier optimized for transducers with a resonant frequency between 1 and 10 MHz and with an internal resistance of approximately 390 ohm is designed. Experimental measurements show a low noise factor (1.46). This advantage reveals the direct correlation between noise PSD of the chain and the real part of the transducer impedance.

Keywords: ultrasonics, piezoelectric transducer, low noise amplifier, optimum design

7 pages, 6 figures

Сitation: Fréderic Coutard, Etienne Tisserand, Patrick Schweitzer. Optimal low noise amplifier for ultrasonic receptor. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2007, 15.

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Frédéric COUTARD was born on 1978 in France. Since 2003, he works at the electronics laboratory of Nancy. He received his Ph. D. in 2007 in Instrumentation and Microelectronics. His research interest is modelling and optimizing the design electronics for the integrated ultrasonic systems.

 
 

Etienne TISSERAND was born on 1962. He received his Ph. D. in 1987 in Electronic and Measurement technology. Actually, He is an Associate Professor in the Henri Poincaré University of Nancy, France. Areas of research interest are the piezoelectric sensors, instrumentation and signal processing.

 
 

Patrick SCHWEITZER was born on 1964. He received his Ph. D. in 1994 in Electronic and Measurement technology. Actually, He is Associate Professor in the Henri Poincaré University of Nancy, France. Areas of research interest are the piezoelectric sensors, instrumentation and signal processing.

e-mail: Patrick.Schweitzer(at)lien.uhp-nancy.fr