Analysis of passive RC integrator in multi pulse signal measurement
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摘要: 由微分测量探头和积分器构成的微分积分测量系统广泛应用于脉冲电压和电流测量。依据无源RC积分器的等效电路，分析了在多脉冲信号测量中，无源RC积分器在实现微分信号的积分还原时，可以引起信号的平顶降和信号基线偏离，给出了平顶降和基线偏离与信号脉冲宽度和积分常数的定量关系，计算了在不同积分器参数和脉冲信号参数时的平顶降和基线偏离结果，并且与PSpice电路模拟结果进行了比较，两种结果一致。按照此定量关系，可以根据脉冲信号特点和测量要求，准确确定积分器参数。Abstract: Differentiating integrating systems composed of differentiating monitor and integrator are often used to measure short pulsed voltage and current in pulse power facilities and accelerators.This paper describes that the passive RC integrator can lead to flat-top drop and baseline deviation when it is used to integrate a single-pulse or multi-pulse differentiating signal. According to the equivalent circuit, the formulas which describe the quantitative relationships between the RC integrator and pulse signal parameters are deduced. Flat-top drop and baseline deviation ratio are calculated under different parameters.They coincide with the PSpice simulation results.The RC integrator parameters can be accurately decided according to the formulas.
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Key words:
- pulse signal /
- differentiating signal /
- integrator /
- flat-top drop /
- baseline deviation
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表 1 不同参数下的PSPICE模拟结果和公式估算结果
Table 1. PSpice simulation results and formula calculation results under different parameters
T1/ns T2/ns R2/kΩ C2/pF δp/% δf/% Δt/ns G2p/% G2f/% G3p/% G3f/% 40 45 3.0 330 3.87 3.90 200 3.60 3.58 6.43 6.52 40 45 3.6 680 1.58 1.60 200 1.67 1.66 3.17 3.19 40 60 3.0 330 3.87 3.90 200 4.78 4.74 8.40 8.63 40 60 3.6 680 1.59 1.60 200 2.21 2.20 4.19 4.24 40 90 3.0 330 3.87 3.90 200 7.05 7.01 12.08 12.76 40 90 3.6 680 1.58 1.60 200 3.30 3.29 6.18 6.32 80 110 3.6 680 3.16 3.17 200 4.02 4.00 7.53 7.69 100 130 3.6 680 3.93 3.95 200 4.73 4.71 8.83 9.05 120 150 3.6 680 4.69 4.72 200 5.44 5.41 10.10 10.40 120 150 3.6 680 4.71 4.72 300 5.23 5.20 9.52 9.80 120 150 3.6 680 4.70 4.72 500 4.81 4.79 8.49 8.71 
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