Designing amplifiers with very low output noise for high impedance piezoelectric transducers

An analytical output noise voltage model of an ultra low noise amplifier for high impedance ultrasonic transducers is presented. Operational amplifier with low input bias current is needed to avoid using compensation resistance that considerably increases the noise at the input of the operational am...

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Veröffentlicht in:	NDT & E international : independent nondestructive testing and evaluation 2005-09, Vol.38 (6), p.491-496
Hauptverfasser:	Yañez, Y., Garcia-Hernandez, M.J., Salazar, J., Turo, A., Chavez, J.A.
Format:	Artikel
Sprache:	eng
Schlagworte:	Acoustics Air-coupled ultrasound Cross-disciplinary physics: materials science rheology Exact sciences and technology Fundamental areas of phenomenology (including applications) Lamb waves Low noise amplifier Materials science Materials testing Physics Transduction acoustical devices for the generation and reproduction of sound Ultrasonic non-destructive testing
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Beschreibung
Zusammenfassung:	An analytical output noise voltage model of an ultra low noise amplifier for high impedance ultrasonic transducers is presented. Operational amplifier with low input bias current is needed to avoid using compensation resistance that considerably increases the noise at the input of the operational amplifier. The proposed analytical model, including the ultrasonic transducer, provides a useful tool to design, compare and select component values.
ISSN:	0963-8695 1879-1174
DOI:	10.1016/j.ndteint.2005.01.004