AWR White Papers

The Importance of EM Analysis for RF/ Microwave Design

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EXTRACT Flow with AWR AXIEM Analysis To use the EXTRACT flow with the AWR AXIEM analysis as the EM desired solver, simply toggle a radio button and change the solver selection of the EXTRACT block to send an automatically created EM document to the AWR AXIEM analysis instead of or in addition to the ACE technology. Figure 10 shows a comparison between the two EXTRACT blocks using the same extraction group name. All elements in the extraction are identical to both analyses. Separate EM documents are created only to illustrate a results comparison, but a single EM document could be used. Figure 10: The EXTRACT flow showing dual use of the ACE tool and AWR AXIEM analysis within a single EXTRACT group The simulators differ in that one has the simulator parameter specified to use AWR AXIEM analysis and the other to use the ACE tool. The difference in the S21 performance of the two options results from the use of EM quasi-static models for the coupled lines in the ACE tool rather than the 3D planar full-wave solution to Maxwell's equations with the AWR AXIEM analysis. While the ACE tool lacks the AWR AXIEM analysis's ability to capture all the physics over the entire band, the overall accuracy is better than that provided by circuit element models alone. The ACE tool's benefit to the flow is in this middle ground, between the speed and ease of circuit element models which leave out critical couplings and the accuracy of AWR AXIEM analysis and other EM solvers, which may take more than the ACE tool's subsecond of extraction time. Together, circuit models, the ACE tool, and the AWR AXIEM analysis form a progressive triumvirate that moves with the designer sequentially through the design flow from concept and circuit models, to the preliminary design with the ACE tool and, finally, to the final simulations with AWR AXIEM analysis. Conclusion EM solvers and circuit extractors are quickly becoming more and more critical to modern RF and microwave design flows. Frequency requirements, circuit complexity, and size constraints continue to drive design flows to more and more intimate concurrency between circuit simulation and layout analysis. These flows have traditionally been hampered by the need to have simulation-driven by schematic on one hand and EM represented by layout on the other. The AWR Design Software platform's EXTRACT flow eliminates this roadblock and improves user productivity by effortlessly enabling EM analysis and circuit extraction directly into a top-down flow. The key benefit of the EXTRACT flow is that the EM setup is totally driven by and derived from the very same schematic, and associated schematic-driven layout that is used for the circuit simulation. Equally important in terms of time savings and elimination of errors, the resulting S-parameter matrix need not be manually retrofitted into a separate or modified schematic. The benefits of EXTRACTflow-enabled, schematic-driven EM simulation go far beyond the obvious automation aspects and associated time savings and related iteration and error reductions. The EXTRACT flow immerses EM analysis into circuit simulation, directly impacting design performance and flow efficiency and opening up significant possibilities for modeling and design for present and future EM extraction needs within the RF/microwave design community. The Importance of EM Analysis for RF/Microwave Design Cadence is a pivotal leader in electronic design and computational expertise, using its Intelligent System Design strategy to turn design concepts into reality. Cadence customers are the world's most creative and innovative companies, delivering extraordinary electronic products from chips to boards to systems for the most dynamic market applications. © 2021 Cadence Design Systems, Inc. All rights reserved worldwide. Cadence, the Cadence logo, and the other Cadence marks found at are trademarks or registered trademarks of Cadence Design Systems, Inc. All other trademarks are the property of their respective owners. ##### 01/21 DB/SA/WP-EXCT/PDF

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