IRIS – Fast RFIC Passive Extraction

Xpeedic IRIS provides RFIC designers a 3D fast EM simulation tool integrated in Cadence Virtuoso design flow. The fast 3D method of moments solver with both multi-core and distributed parallelization greatly reduces the EM simulation time thus improves the design efficiency. The seamless integration with Virtuoso not only enables designers to stay in the Cadence design environment to perform the EM simulation which avoids the manual and error-prone layout data conversion, but also realizes the perfect convergence to front-end for design verification by automatic back-annotation. This design flow will greatly help RF IC designers to reduce the design cycles and achieve first-pass silicon success.



  • IRIS design flow is seamless integration with Cadence Virtuoso design environment. After start Virtuoso and click IRIS in “Launch” menu under layout editing window, an “IRIS” menu and iCell Manager Window will show up.

IRIS Virtuoso Interface

  • User can configure all mesh and simulation parameters through IRIS Virtuoso Interface after start IRIS successfully. IRIS simulation setting windows is quite easy, most of them are set automatically based on physical parameters.

iCell Manager

  • In IRIS, after open layout view of any cell, user should select part of the design for EM simulation, IRIS will convert it to iCell automatically under iCell Manager window’s management.

Optimal Mesh Technology

  • iCell generated from Virtuoso layout for EM simulation use optimized mesh to balance speed and accuracy, IRIS 3 / 6 mesher support rectangle and triangle mixed mesh to improve simulation speed and convergence. IRIS 3dview support 3D view of both layout structure and mesh.

3D EM Solver

  • IRIS deploys a fast 3D full-wave Method-of-Moment (MoM) based EM solvers which delivers both speed and accuracy, and support 3D mode simulation to capture sidewall effect, and make it suitable for 45nm technology and below.

Parallel Processing Technique

  • In addition to the fast computation technology used in solver, IRIS also supports parallel processing technology to reduce simulation time. Both of distributed processing and multi-core processing are available, which can further increase the simulation efficiency with the update of computer hardware environment.

Export to HFSS Project

  • IRIS makes it easy to export to the popular 3D FEM tool HFSS. A window prompts for user to do some basic setups for HFSS project. It helps to set up the 3D model, ground ring, air box, materials, excitations, EM boundaries and simulation sweep plan. The resultant HFSS is ready to run with no need of manual editing.

Post Process

  • SnpExpert provides powerful Sparameter post-process capability. The template function enables user to plot by one click. Equivalent circuit model and broadband SPICE model can be exported in addition to Sparameter.

Back Annotation

  • Back annotation performs to modify part of the original circuit with Sparameter model or spice model from IRIS EM simulation. Just by simple clicks, IRIS can replace devices or nets or the combination of both of them with iCell models. Then user can simulate the whole design with modified parts to check whether it meets the design specification by circuit simulation.

Current Density Display

  • The display of current density enables users to review the current distribution of device, which provides physical insights.

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