Tired of Building Signal Integrity Test Vehicles for every new design / technology rev for every material?

Save months of time and tens to hundreds of thousands of dollars using Gauss SI Pro!

Current practice in the industry revolves around building a variety of test vehicles and testing for insertion loss at various frequencies. This could take several months before the data is available! If any one of the parties – the board shop, OEM, or laminator – is not fully invested, the time could stretch to a year or longer. Variables like copper roughness, oxide roughness, line width, and dielectric properties all play a role in the insertion loss, so even once this is complete, the data obtained is not useful for prediction.

Unfortunately, until now, the software tools available in the market were not able to predict the insertion loss accurately. Coupled with the inaccuracy of the impedance models, this made the use of SITVs necessary.

But Not Anymore.

Gauss SI pro offers an integrated answer in helping predict the insertion loss very accurately within +/-7 % compared to other software being off by 40-60 %.

The workflow involves actual measurements of the oxide roughness and the Copper foil roughness which have to be input into the Software. Everything else is handled by Gauss which solves for impedance and loss to give you results well within the measurement variation.

And Gauss doesn’t stop at single point estimates – it conducts Uncertainty Analysis to determine distributions and confidence intervals based on manufacturing tolerances – giving you the ultimate insight into your designs!

The Old Paradigm: Signal Integrity Test Vehicles

The two most important attributes, especially for high frequency, high data rate applications, from a Signal Integrity standpoint in PCB transmission lines are Impedance and Loss. Most advanced Signal Integrity simulation software is reasonably accurate for impedance, but insertion loss, especially at higher frequencies, shows a substantial mismatch between simulation and measurement, with simulation significantly underpredicting measured loss results. Historically, this has been attributed to either more lossy dielectric (higher DF than reported) or more lossy copper (higher roughness than reported). In order to characterize this “missing loss”,  the industry has turned to loss parameter extraction from specially designed Signal Integrity Test Vehicles.

The New Paradigm

With Gauss SI Pro, you don’t need to ever build another Signal Integrity Test Vehicle! Gauss SI was built from the ground up with a high-order Finite Difference and high-order Integration computational engine, to provide the highest accuracy at very high speed. Gauss SI’s superior underlying technology results in higher accuracy than not only the lower end Boundary Element based software, but even the highest end Finite Element based software, with zero setup time, and hundreds of predefined geometries. Most importantly, because Gauss SI Pro models key factors like proximity effect and the impact of resin outflow / neat resin properties between traces and adjusts for Dk/DF measurement methods – unlike any other solution in the market today – it shows exceptional agreement between simulation and measurement for insertion loss, truly eliminating the need for insertion loss measurement of Signal Integrity Test Vehicles.

Insertion Loss Benchmarks

In the first two examples, we show a comparison between measured insertion loss and simulated insertion loss from Gauss SI Pro. These cases show very close agreement.
Similarly, in the bottom two examples, we show a comparison between measured insertion loss and simulated insertion loss as reported by two well-regarded competitors, as well as by Gauss SI Pro. All of these examples were run with the reported dielectric properties and copper roughness data and the dimensions of the measured traces – no fudge factors or tuning. As evidenced by the two examples, Competitor B shows very poor accuracy for insertion loss over the full domain. Competitor A, while not as poor as Competitor B, also shows poor accuracy that gets perceptibly worse with frequency. However, Gauss SI Pro (the blue line) tracks extremely closely with the measured insertion loss, something not previously attainable with transmission line simulation, finally bridging the gap between simulation and measurement.

Break free of the old paradigm for PCB transmission line simulation with Gauss SI Pro Today!