Digital geophone is an important component in the digital B ultrasonic diagnosis system,it demodulates the amplitude infor-mation that reflect the human tissue from the ultrasonic echo signals,the detection method selection and achieve results directly affect the o-riginal ultrasound image quality.To meet the digital B ultrasound diagnosis imaging system development requirement,according to human ul-trasonic echo signal characters,take the digital quadrature detection technology to complete ultrasound echo amplitude demodulation,and im-plemented the detection technology in FPGA.The results show that the method achieved effect in an image with horizontal and vertical reso-lution and other performance parameters are significantly better than the national index requirements.%数字检波器是 B超诊断系统中信号处理的重要组成部件，它从超声回波信号中解调出人体组织反馈的幅度信息，检波方法的选择与实现效果直接影响原始超声图像质量；为满足数字 B超诊断系统开发中成像的要求，根据人体超声回波信号的特点，采用数字正交检波技术完成超声回波幅度解调，并将该检波技术在 FPGA 中实现；结果表明，该方法的设计与实现效果在图像的横、纵向分辨率等性能参数均大幅度优于国家指标要求。
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