Common-Centroid Layouts for Analog Circuits: Advantages and Limitations

Arvind Sharma, Meghna Madhusudan, Steven M. Burns, Parijat Mukherjee, Soner Yaldiz, Ramesh Harjani, Sachin S. Sapatnekar

202129 citationsDOI

Abstract

Common-centroid (CC) layouts are widely used in analog design to make circuits resilient to variations by matching device characteristics. However, CC layout may involve increased routing complexity and higher parasitics than other alternative layout schemes. This paper critically analyzes the fundamental assumptions behind the use of common-centroid layouts, incorporating considerations related to systematic and random variations as well as the performance impact of common-centroid layout. Based on this study, conclusions are drawn on when CC layout styles can reduce variation, improve performance (even if they do not reduce variation), and when non-CC layouts are preferable.

Topics & Concepts

CentroidIntegrated circuit layoutMatching (statistics)Computer sciencePage layoutParasitic extractionRouting (electronic design automation)IC layout editorVariation (astronomy)Computer engineeringElectronic engineeringIntegrated circuitEngineeringArtificial intelligenceCircuit extractionMathematicsEmbedded systemElectrical engineeringStatisticsVoltageOperating systemEquivalent circuitAdvertisingAstrophysicsPhysicsBusinessAdvancements in Semiconductor Devices and Circuit DesignVLSI and FPGA Design TechniquesVLSI and Analog Circuit Testing