Cadence® system design and verification solutions, integrated under our System Development Suite, provide the simulation, acceleration, emulation, and management capabilities.
System Development Suite Related Products A-Z
Cadence® digital design and signoff solutions provide a fast path to design closure and better predictability, helping you meet your power, performance, and area (PPA) targets.
Full-Flow Digital Solution Related Products A-Z
Cadence® custom, analog, and RF design solutions can help you save time by automating many routine tasks, from block-level and mixed-signal simulation to routing and library characterization.
Overview Related Products A-Z
Driving efficiency and accuracy in advanced packaging, system planning, and multi-fabric interoperability, Cadence® package implementation products deliver the automation and accuracy.
Cadence® PCB design solutions enable shorter, more predictable design cycles with greater integration of component design and system-level simulation for a constraint-driven flow.
An open IP platform for you to customize your app-driven SoC design.
Comprehensive solutions and methodologies.
Helping you meet your broader business goals.
A global customer support infrastructure with around-the-clock help.
24/7 Support - Cadence Online Support
Locate the latest software updates, service request, technical documentation, solutions and more in your personalized environment.
Cadence offers various software services for download. This page describes our offerings, including the Allegro FREE Physical Viewer.
Get the most out of your investment in Cadence technologies through a wide range of training offerings.
This course combines our Allegro PCB Editor Basic Techniques, followed by Allegro PCB Editor Intermediate Techniques.
Virtuoso Analog Design Environment Verifier 16.7
Learn learn to perform requirements-driven analog verification using the Virtuoso ADE Verifier tool.
Exchange ideas, news, technical information, and best practices.
The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information.
It's not all about the technlogy. Here we exchange ideas on the Cadence Academic Network and other subjects of general interest.
Cadence is a leading provider of system design tools, software, IP, and services.
Happy New Year!
Electromagnetic Solution 2D (EMS2D) is designed for accurate transmission line parameter extraction over a full frequency range from DC up to the frequency of interest. However, this accuracy depends on an accurate and complete physical model provided to the solver by users. For example, the parameter for conductor surface roughness is missing from the input parameter list to the solver.
In multiple GBPS digital designs, the conductor surface roughness can contribute an extra 30% or more energy loss. Therefore this effect should be included in the SI analysis and the field solver should provide the lossy transmission line model with roughness effect included.
The EMS2D field solver has been enhanced in the SPB16.3 PCB SI release to include the effects of conductor surface roughness.
The roughness effect is analyzed by the Hammerstad model. Due to the surface roughness, the conductor resistance per unit length is significantly increased:
The Hammerstad model is especially accurate for good conductors and is working very well when roughness is 1 to 3 µm (RMS). An alternative modified Hammerstad model is also provided which, based on published literature report, is more accurate than the standard Hammerstad model in certain cases.
Based on this model, effective conductivity is induced and used in the electromagnetic equations within EMS2D. As a consequence, both resistance and inductance will be modified at a low frequency range and all transmission line parameters will be impacted at high frequency when full-wave computations are done. Furthermore, the insertion loss in S parameter modeling will be larger than without the roughness effect.
Options for Defining Surface Roughness
Conductor surface roughness is defined for the EMS2D field solver by the following two parameters:
The SurfaceRoughnessModel defines the type of model that is to be used by EMS2D to compute the effects of surface roughness. The possible values for this parameter are:
The RoughnessRMS parameter defines the root mean square value of the roughness surface. Typically this value is a few µm. For ½ oz. copper foil, the surface roughness is about 1.9 µm; for 1 oz. copper, it is about 2.4 µm; for 2 oz. copper, about 2.9 µm.
The above two parameters must be used simultaneously. EMS2D will not produce a roughness model if either is missing.
The Surface Roughness Model field has a pull-down with values of Hammerstad, Modified Hammerstad, Exponential and None. A value of None indicates that surface roughness is not to be modeled. The Surface Roughness RMS value field allows you to specify the roughness RMS value. The default unit for this field is µm. These two new preference values are saved in the signoise.run/casex directory. A change in either of these values causes any existing simulation data in the case to be invalid. Two environment variables are also available to enable roughness model extraction. Similar to the options in the GUI, the two environment variables are:
Please share your experiences with this new modeling capability.
Jerry "GenPart" Grzenia