Optimal low noise amplifier for ultrasonic receptor
Автор: Coutard Frderic, Tisserand Etienne, Schweitzer Patrick
Журнал: Техническая акустика @ejta
Статья в выпуске: т.7, 2007 года.
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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. is designed. 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.
Piezoelectric transducer, low noise amplifier, ultrasonics, optimum design
Короткий адрес: https://sciup.org/14316074
IDR: 14316074
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