Avishtech announced the availability of the latest version of its Gauss Stack PCB stackup design and simulation solution. This version includes an extensive dielectric materials library that enables rapid specification and implementation of a complete stackup design that includes both electromagnetic and thermomechanical simulations, fully integrated, with no additional user input of material data required. Gauss Stack accurately predicts resin starvation and glass stop issues and provides board level thermomechanical properties including coefficients of thermal expansion in all directions—X, Y and Z axis (both above and below Tg).

Keshav Amla, founder and CEO of Avishtech noted, “Today’s high data rate products including 112 Gbps/channel and 5G/mmWave applications have very little ‘wiggle room.’ A slight mistake in one area can quickly render a design inoperable or unmanufacturable. Prior to this point in time, there was no EDA product that enabled a real Multiphysics approach, where product developers can carry out electromagnetic and thermomechanical simulations, manufacturability checks and reliability predictions. The process consisted of ‘best guess’ estimations that had to be verified through the building of a test vehicle board. And, if there were problems detected at the test-board level, the only solution was to go back to square one and start the process all over again. This led to time-intensive and expensive rework that could then impact critical time-to-market windows, competitive advantages and overall profitability of a product line.”

“What we have done with Gauss Stack is to effectively bridge the gap between the design and manufacturing processes” continued Amla. “Now, instead of just applying ‘best practices’ and hoping that the PCB you design will sync up with the characteristics of the dielectric material you have selected, with Gauss Stack, you can move forward with a right-the-first-time design that meets your performance characteristics but is also manufacturable, reliable and profitable.”

The specific features of Gauss Stack include: the ability to accurately model insertion loss by accounting for ground plane losses; the accurate prediction of resin starvation and glass stops that includes the effect of dielectric filler and conductor roughness; the ability to accurately simulate the PCB thermomechanical properties that are critical for reliability predictions; the further simulation, based on these board level thermomechanical properties, of plated though-hole reliability, microvia reliability and solder joint reliability; the ability to perform simulations for the impedance and frequency and roughness dependent losses associated with dielectric materials, for the full stackup with one click; and the additional ability to perform synthesis to simulate line widths required to achieve a target impedance, again for the full stackup with one click.

Amla continued, “At the higher level, Gauss Stack enables you to predict failure modes at the stackup design stage. Prior to now, product designers weren’t able to predict how resin content, glass weave, retained copper percent, and other aspects of their designs would impact the board level properties or the manufacturability and reliability of their boards.  And, with today’s high-frequency, high-date rate designs, these are often the hidden ‘gotchas’ that determine whether your product will work as designed or even if the product can be successfully manufactured. Gone are the days when designing for just one attribute was sufficient.”

While numerous EDA toolsets contain massive amounts of information in the form of libraries, the ability to quantify and qualify that data in a meaningful way is not always possible. Amla explains, But, we haven’t just built another iteration of the same mouse trap—a broad-based laminate database. Instead, we have incorporated into Gauss Stack a level of intelligence in the form of a proprietary algorithm that is able to extract detailed mechanical properties at the polymer level that are critical for the afore-mentioned thermomechanical simulations that Gauss Stack conducts. Based on these simulations it’s possible to determine how these properties will impact the design, manufacturability, long-term operability and reliability of the end product. We have done extensive validation of our predictions on several built test vehicle boards and all of our results have been within experimental error.”