过电压保护元件建模的时频结合表征方法

Stanislav Scheier, Dominik Deelmann, S. Frei, C. Widemann, W. Mathis
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引用次数: 2

摘要

非线性电压敏感保护元件,例如多层压敏电阻(MLV)或瞬态电压抑制器(TVS)可用于保护IC引脚免受系统级ESD的影响。这类元件在快速瞬变时可能表现出明显的电压超调。本文介绍了一种时域和频域相结合的表征方法及其在MLV中的应用。利用VNA在不同直流偏置点上的阻抗测量用于模型识别和参数化。用TLP iv曲线外推了非线性模型部件在高电压和高电流下的静态非线性iv行为。该模型在时域上成功地用ESD脉冲进行了验证。可以高精度地再现瞬态行为,包括发生的电压超调。
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A combined time and frequency domain characterization method for modeling of overvoltage protection elements
Nonlinear voltage sensitive protection elements, e.g. Multi-Layer Varistor (MLV) or Transient Voltage Suppressor (TVS) are useful to protect IC pins from ESD on System Level. Such elements might exhibit a significant voltage overshoot for fast transients. This work describes a combined time and frequency domain characterization method and its application to an MLV. Impedance measurements with VNA at different DC-bias points are used for model identification and parameterization. The static nonlinear IV-behavior of nonlinear model part at higher voltages and currents is extrapolated with a TLP IV-curve. The model is successfully validated with ESD pulses in time domain. The transient behavior including the occurring voltage overshoot can be reproduced with high accuracy.
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