PCB Systems Design Blog

Posts tagged with 'dielectric'

Measurement correlation is just a stackup away

Posted Aug 4, 2011, by Patrick Carrier

Whether you are trying to correlate simulated waveforms to measured waveforms for a DDR3 signal, or board timing numbers for a simple SDRAM bus, or measured Z-parameters when looking at a PDN impedance, or even just a simple trace impedance measurement on the TDR, it all begins with the proper stackup.  I explore some of the commonly overlooked nuances of stackup modeling in my recent article in InCompliance … Read More

Tags: dielectric, HyperLynx, correlation, measurement, measurement correlation

Can you make Z higher?

Posted Aug 2, 2011, by Patrick Carrier

Simulations should match measurements.  Otherwise, what good are they?  When doing signal integrity simulations, that starts with comprehensive stackup modeling.  I quite often hear that stackup editor calculations don’t match measurements, but when I probe deeper, I usually find that the stackup has not been modeled properly.  More often than not, the calculated impedance ends up being much lower … Read More

Tags: stackup, dielectric, dielectric constant, correlation, measurement, HyperLynx, impedance

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