A new signal source for electric impedance tomography system is developed to improve the high-frequency performance and to reduce the noise level of the old one.
目的研制用于电阻抗断层成像系统的信号源，提高现有系统的高频特性，同时降低其噪声水平。
As the charge exerted from input voltage source is dependent on quantization error and input noise voltage to a large extent, the circuit has high signal input impedance.
由于提取自输入电压源的电荷很大程度上仅取决于量化误差与输入噪声电压，所以电路具有高信号输入阻抗。
Take into account each line's bandwidth requirement, source impedance, signal magnitude, and run length;
考虑每条线带宽的需求，源阻抗、信号幅值和运行长度；
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