Reads bench files
Touchstone, CSV and LCR-meter tables, with a preview before fitting.
From the bench to a model you can trust.
Drop in a Touchstone or impedance file. Get the parasitics with error bars and a passive SPICE model.
What does the Bench-to-model do?
Bench-to-model turns measured impedance into a circuit model. Upload data from an impedance analyser, LCR meter or vector network analyser (Touchstone .s1p/.s2p, CSV or LCR tables), and it fits a physical template (for example an inductor with winding capacitance, or a capacitor with ESR and ESL) and reports each parameter with an error bar. It also fits a passive rational model by vector fitting and exports it as a SPICE subcircuit, guaranteed passive so it will not make your simulation unstable.
Features
Parameters with error bars
Identified ESR, ESL, capacitance, inductance and resonances with uncertainty from the data.
Passive SPICE export
A rational model by vector fitting, checked for passivity, exported as a subcircuit.
Feeds the other modules
Measured parasitics go straight into the Circuits, EMI and PDN models.
Limits
A model is only as good as the measurement: fixture de-embedding and calibration are your responsibility. Fits are bounded to 5000 points and 30 poles.
Every module ships with reference cases that run in our CI. See validation for how results are checked.
Related modules
PDN & Power Integrity
Power-integrity analysis in the browser: plane-pair cavity, decoupling capacitors and VRM, the PDN impedance Z(f) at the load against your target impedance, and a decap optimizer.
Circuits & Power Electronics
Browser circuit simulator for power electronics: DC, AC, transient, Bode and exact switching steady state in one solve. Opens LTspice .asc schematics. Runs on Mac, Linux, Windows and Chromebooks.
Conducted-EMI Predictor
Predict the conducted-emission spectrum of a switching converter through a LISN against CISPR 32, CISPR 25 or FCC Part 15.107 limits, with DM/CM split, peak, quasi-peak and average detectors, margin and a first filter.
Try the Bench-to-model.
Frequently asked questions
What file formats can I upload?
Touchstone (.s1p, .s2p), CSV and common LCR-meter tables.
Is the exported SPICE model passive?
Yes. The fitted rational model is checked and enforced to be passive before export.