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根据超声信号在组织传播衰减速度快,穿透深度与接收回波信号强弱成反比的特性,以及超声成像数据采集系统高增益、增益可变的要求,提出了一种低噪声、宽带宽增益可调前端调理电路方案.系统合理地进行低噪声前置放大,基于AD8331的可变增益放大、滤波等,给出了各个模块的设计详图以及仿真结果,综合设计指标,为超声成像后期数据采集的调理提供了可靠的依据.
According to the fact that the propagation speed of ultrasonic signal in tissue is fast, the depth of penetration is inversely proportional to the strength of received echo and the requirements of high gain and variable gain of ultrasonic imaging data acquisition system, a low noise, wide bandwidth gain Adjustable front-end conditioning circuit. System reasonable low-noise preamplifier, based on AD8331 variable gain amplification, filtering, etc., gives the design details of each module and simulation results, the integrated design indicators for the latter part of ultrasound imaging data The collected conditioning provides a reliable basis.