WRT will take its SI design and measurement expertise and apply it to your needs. Be it custom channel modeling platforms designed around your PCB materials and stack-up, or a completely new test fixture, WRT has done it all.

The goal of our modeling program is to equip a signal integrity group with unimpeachable 3D EM models and material properties that achieves less than 2 Ohms measure-based TDR to simulation and Extreme Signal Integrity performance and a 2% impedance tolerance for Stripline transmission lines (WRT has a process to exceed the 5% even for multi-laminate construction).

Material Identification Program

WRT has a highly proprietary material ID methodology, using a host of structures that are used to fit material ID in X-Y and Z PCB orientation. There is both a model-based pre-fabrication and measure-based post-verification phase built into each program.  Our material Identification and modeling is EDA-centric, fitting the models in 3D electromagnetic (EM) simulation software.

Construction of a reduced size Channel Modeling Platform (CMP) that focuses solely on material ID is core to this activity.   There is a partial set of verification structures that are used to verify the models.

In the post-fabrication phase, measurements of the CMP undergo comprehensive S-parameter quality checks which proceeds careful calibration. Cross-sectional analysis using a PCB test strip included with each CMP is also done, as well as PCB fabrication verification.

Measurements, comprehensive model material ID fit reports, PCB libraries of the CMP, and measurement to simulation examples are included in each final report.

See part of an example report here.

 

2D, 2.5D, and 3D Simulations to 90 GHz

The Material Identification program is a pre-requisite of this service activity if WRT has not designed with laminate system.   We can discuss this in first meeting.

  • Modeling using Ansys HFSS (3D), Simbeor (2 and 2.5D)
  • Optimization of via (SE and DIFF), breakouts, edge launches, etc
  • Model verification from vendor (ELF launch, VLF launch, backplane connector EDA model verification)
  • Simulated to Measured Correspondence Program and Report

See examples of EDA optimization here.