Ultrasonic preamplifier performance evaluation

Paper is analyzing the ultrasonic preamplifiers performance comparison problem. Technique and equipment for ultrasonic preamplifier's performance evaluation and different manufacturers' products comparison has been established. Equipment used and measurement technologies applied are described and presented. Experimental results for the measured complex gain (magnitude and phase) of the preamplifier, the preamplifier equivalent input noise, and preamplifier input impedance (expressed as resistance and capacitance connected in-parallel) and evaluation of the preamplifier linear mode recovery after the disturbance caused by the high voltage pulse are presented. Such set of the experimental investigation results allows deciding which amplifier is performing the best.