Plane-pair cavity
Plane resonances and spreading inductance between the capacitor and the load.
PDN impedance, under target.
Plane pair, decaps and VRM in one model. See Z(f) at the load against the target impedance and let the optimiser pick the capacitors.
What does the PDN & Power Integrity do?
The PDN & Power Integrity module models the power distribution network of a board: the voltage regulator, the plane-pair cavity with its resonances, and the decoupling capacitors with their mounting inductance. It plots the impedance seen at the load across frequency against the target impedance you derive from the supply tolerance and transient current, and a decap optimiser chooses capacitor values and counts to stay under the target at the lowest part count.
Features
Decaps with mounting
Capacitor ESR, ESL and via mounting inductance, not just the capacitance.
Target impedance
Z(f) at the load against the target set by voltage tolerance and transient current.
Decap optimiser
Chooses values and counts to meet the target with fewer parts.
Limits
A board-level lumped and cavity model: package and die PDN must be supplied as parameters.
Every module ships with reference cases that run in our CI. See validation for how results are checked.
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Try the PDN & Power Integrity.
Frequently asked questions
How is target impedance calculated?
Target impedance is the allowed supply ripple divided by the transient current step. The module plots the PDN impedance at the load against it across frequency.
Can it choose decoupling capacitors for me?
Yes. The decap optimiser picks capacitor values and quantities to keep the impedance under target.