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中文摘要：
设计一种基于FPGA的超声波碎石系统信号发生与自动调节输出控制器。采用FPGA实现直接频率合成技术，采用FPGA监控换能器两端输出电压与电流的T T L电平信号，根据电流、电压相位差来控制输入正弦波信号的频率，最终实现控制器的设计。实验结果表明，该控制器输出信号稳定，系统反馈调节精度高。
英文摘要：
A FPGA-based controller for signal generation ,automatic regulation and output used in the ultrasonic lithotripsy system was designed .It uses FPGA to realize direct frequency synthesis ,and employs TTL level signal of the output voltage and current at both ends of FPGA monitoring trans-ducer to adjust the frequency of the sinusoidal signal inputted on the basis of the current ,voltage phase difference for the ultimate automatic control .Experimental results show that the controller is a-ble to output stable signal and its feedback regulation is accurate .
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