How accurate is EZMod3D in inductance extraction ?
Square Spiral Inductor measurement

How accurate is EZMod3D in inductance extraction ?

Jean-Francois Debroux Jean-Francois Debroux

Jean-Francois Debroux

Senior Analog IC Designer at EASII-IC

发布日期: 2023年11月9日
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It is often difficult to estimate the inductance of arbitrary shaped conductors. On of the solutions to address this issue is using a 3D Field Solver such as EASII-IC EZMod3D. When using a tool, it is important to be confident in the results it generates. The best way for checking an inductance extractor is to compare the results to actual measurements.

In this case, a square spiral inductor was implemented as a PCB. This is not at properly speaking an arbitrary shape since there are formulas to calculate such inductors value.

With the parameters of the test inductor, Wheeler formula predicts 2.14 micro-henrys.

As can be seen in the headline picture, measured value is 2.10 micro-henrys.

Now, what about EZMod3D extracted value ?

EZMod3D view of simulated square spiral inductor

EZMod3D generates the following netlist:

* SquareSpiral50m_36u 6715125 Nodes

.SUBCKT EQUIVR0_COARSE

+ Pin2

+ Pin1

RR00 Pin1 Pin1__Pin2 1.58269875103855651e-01

LR00 Pin1__Pin2 Pin2 2.18939580097580881e-06

.ENDS EQUIVR0_COARSE

EZMod3D extracts an inductance value of 2.19 micro-henry and a series resistance value of 0.158 ohms.

Not so bad !

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