Electromigration on Signal Interconnects (20140089, Dr. Sachin Sapatnekar)

Technology No. 20140089

Efficiently Characterizes Cell-internal Electromigration

The problem of cell-internal electromigration (EM) on signal interconnects within a standard cell is solved using this technology which efficiently characterizes EM characteristics of gates in a standard cell library, under all pin positions, based on a single circuit simulation and graph-based methods. The approach uses Joule heating effects to model and efficiently characterize cell-internal EM to analyze the lifetime of large benchmark circuits. A related method optimizes circuit lifetime by changing pin positions in gates within a circuit. This procedure has demonstrated an approximate 60% increase in circuit lifetime.

Optimization of Circuit Lifetime

Standard cell-based gate libraries are the bedrock of integrated circuit design. Electromigration (EM) in on-chip metal interconnects is a critical reliability failure mechanism in nanometer-scale technologies and is an increasing problem in integrated circuits that reduces circuit lifetime. Traditionally, EM affected global wires, but in current and future technologies, within-gate wires will also be significantly affected. Currently, EM checks in existing technologies are performed ad hoc; no current methods systematically perform cell-internal EM or allocate pin positions to increase the lifetime of a circuit that uses numerous standard cells. This technology provides a systematic and computationally efficient way for analyzing cell-level EM and translating it to an analysis and optimization of circuit level lifetimes.

BENEFITS AND FEATURES:

  • Models and efficiently characterizes cell-internal EM
  • Characterizes EM characteristics of gates in a standard cell library under all pin positions
  • Analyzes lifetime of large benchmark circuits
  • Optimizes circuit lifetime
  • Joule heating effects
  • Solves cell-internal EM problems
  • Approximate 60% increase in circuit lifetime

APPLICATIONS:

  • Integrated circuit design
  • Circuit design

Phase of Development - Prototype dev

Researchers
Sachin Sapatnekar, PhD
Professor, Electrical and Computer Engineering, University of Minnesota
External Link (ece.umn.edu)
Vivek Mishra, PhD
Electrical and Computer Engineering, University of Minnesota
Palkesh Jain, PhD
Ricardo Reis, PhD
Universidade Federal do Rio Grande do Sul , Brazil
Gracieli Posser, PhD
Universidade Federal do Rio Grande do Sul , Brazil

Publications
A Systematic Approach for Analyzing and Optimizing Cell-Internal Signal Electromigration
IEEE/ACM International Conference on Computer-Aided Design, Digest of Technical Papers, ICCAD. 2015, pp. 486 – 491, 2014
Cell-Internal Electromigration: Analysis and Pin Placement Based Optimization
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems, Vol. 35, No. 2, pp. 220 – 231, February 2016

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