Design and Optimization of Drive Circuit for CMUT Transducers
Capacitive micromechanical ultrasonic transducers(CMUT)have advantages such as good electro-acoustic charac-teristics,small size,and easy fabrication of arrays.It has broad application prospect in the fields of medical science and ships.This paper designs a driving circuit based on FPGA and MAX14808 chip as the core for a self-developed close-packed CMUT element.This circuit is used to generate square wave pulses and perform related tests in the mode of single ended clock,differential clock,and transparent.The test results show that phase difference angle between the output of driving circuit and the INP1/INN1 input is consistent,and the delay time difference between the output and the INP1/INN1 input is small in the mode of single ended clock and differential clock.During transmit-receive test,the received signal decays exponentially with increasing distance,and as the in-put voltage increases it basically increases linearly and has a small arc.The stability of single ended clock mode is the best.The clock mode design of driver circuit can resynchronize all data inputs of the master chip to reduce phase noise related to FPGA output signals.This paper provides hardware support for underwater and medical ultrasound imaging systems,also provides methods for CMUT testing research.
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