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Analyzing Electromigration (EM) and Voltage (IR) drop in IC designs while they are in the design phase should be an unmissable step. EM and IR analyses are done for each block when the layout is done and then again at the end of the design process on the IC chip. It enables the IC designer to effectively implement a robust design with minimum power integrity issues.
At advanced nodes, the IC designing has been evolving and has witnessed many changes, such as:
So, when the size of a transistor shrinks, power management becomes more critical. Also, with IC designs becoming increasingly larger in size and more complex than before, EM rules themselves are growing in complexity! That is why EM and IR analyses have traditionally been significant checkpoints in the physical verification of transistor-level designs in analog and mixed-signal circuits.
EM effect and IR drop analyses reduce the probable power integrity issues in IC designs and enable designers to improve the IC designs early on. It also lets them run a quick sanity check to identify problems in a circuit schematic due to reasons like length and width of wires.
The Cadence Voltus-Fi XL Power Integrity Solution/Spectre® Circuit Simulator EM/IR analysis in Virtuoso ADE Explorer and Virtuoso ADE Assembler is designed to provide higher capacity and better performance, as compared to any existing EM/IR solutions in the industry. Additionally, handling of complex EM rules in Virtuoso ADE makes the adaptation to newer technologies easier.
The EM/IR solution in Virtuoso ADE has the capability to support simulators such as Spectre (for analog designs), and AMS (for mixed-signal designs) for transistor-level analysis.
If enhanced simulation speed with golden accuracy EM/IR analysis is your requirement, you can choose to use Spectre Accelerated Parallel Simulator (APS) with both Spectre and AMS Designer. Spectre APS is the recommended solver to start with any EM/IR performance or accuracy evaluation of small design block, or designs with smaller number of RC nets. It also supports both Direct and Iterated EM/IR analysis methods.
Note: EM/IR Analysis with AMS Simulator also supports power macro generation.
To know more about this feature and how to run it in Virtuoso ADE Explorer, check out the AMS EM/IR Analysis in Virtuoso ADE Environment videos available on the Cadence Online Support Portal.
Click the video link now or visit Cadence Online Support and search for Virtuoso videos under Video Library.
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Harsh Gupta and Vani Verma (Team Virtuoso)