Design of a low noise preamplifier for ultrasonic transducer

Abstract

The low noise preamplifier, used for the ultrasonic transducer, design approach is presented. Optimization is based on noise model for both electrical and the acoustical part of receiver. Every noise component has been investigated separately, using various transducers and operational amplifiers models. Noise behavior has been presented in diagrams for analysis. Every noise component has been minimized separately. For signal propagation evaluation, narrowband signal case has been considered. In has been shown that different ultrasonic transducers amplifier circuitry and amplifier type has to be chosen individually in order to improve signal-to-noise ratio.