多通道超声相控阵驱动控制系统设计

低强度经颅聚焦超声是一种利用脉冲聚焦超声调控脑神经元的治疗技术。为抑制人颅骨的非均质性和个体结构差异影响，须对多阵元相控阵聚焦换能器的各阵元进行参数调控实现经颅精准定位聚焦，各阵元参数调控需通过相位控制和驱动电路系统来实现。该文设计并搭建了一种基于直接数字式频率合成技术的多通道相位、幅值独立可调的相控驱动系统。实测结果表明，可实现正弦波和方波高精度相控输出，输出信号电压峰峰值在0~37.5 V可调，相位分辨率为0.1°，延时误差小于1 ns，可满足多阵元相控阵聚焦换能器驱动及其所需相位分辨率的需要。

Multi-channel ultrasonic phased-array drive control system design

Low-intensity transcranial focused ultrasound is a therapeutic technique that uses pulsed focused ultrasound to modulate brain neurons. In order to suppress the non-homogeneity of human skull and individual structural differences, the parameters of each array of the multi-array phased-array focusing transducer must be regulated to achieve precise transcranial positioning and focusing, and the parameters of each array must be regulated by the phase control and drive circuit system. In this paper, we designed and built a multi-channel phase and amplitude independently adjustable phase control drive system based on direct digital frequency synthesis technology. The measured results show that the high-precision phase control output of sine wave and square wave can be realized, the peak-to-peak output signal voltage is adjustable from 0 to 37.5 V, the phase resolution is 0.1°, and the delay error is less than 1 ns, which can meet the needs of multi-array phased array focusing transducer driving and its required phase resolution.