In order to improve the probing depth,resolution,and image quality,ultrasonic endoscope imaging system generally applies coded exciting technique. ‘Half-bridge circuit'which is widely used in the design of switching power supply circuit was employed in the ultrasonic endoscope coded excitation circuit for the first time. The circuit could generate positive and negative high voltage excitation pulse from only one positive voltage power supply. Based on the motor rotation coded signal,synchronous coded excita...
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