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This study on Field-Programmable Gate Array (FPGA) I/O paths reveals distinct degradation mechanisms under different stress conditions. Resistance drift monitoring can differentiate between on-die and package-level aging in electronic systems.

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Area of Science:

  • Electrical Engineering
  • Materials Science
  • Semiconductor Device Physics

Background:

  • Field-Programmable Gate Arrays (FPGAs) are crucial in modern electronics.
  • Understanding the reliability of FPGA I/O paths under stress is vital for system longevity.
  • Degradation mechanisms can differ based on applied electrical and thermal stress conditions.

Purpose of the Study:

  • To investigate resistance drift in FPGA I/O paths under combined electrical and thermal stress.
  • To differentiate between on-die and package-level degradation mechanisms.
  • To establish a foundation for reliability assessment and self-monitoring in electronic systems.

Main Methods:

  • Utilized a Xilinx Spartan-6 FPGA for testing.
  • Employed a multiplexed measurement approach to track resistance, voltage, and current.
  • Applied accelerated stress modes: high-temperature dwell (80-120 °C) and thermal cycling (80-140 °C).

Main Results:

  • Both stress modes showed sub-linear (power-law) resistance change over time.
  • Arrhenius analysis revealed distinct activation energies: ~0.62 eV for dwell, ~1.3 eV for cycling.
  • Lower activation energy linked to on-die degradation; higher energy to package-level thermo-mechanical damage.

Conclusions:

  • Resistance drift in FPGA I/O paths effectively distinguishes between device-centric and package-centric aging.
  • Findings support the development of resistance-based monitoring for electronic system reliability.
  • The study provides insights into FPGA aging mechanisms for improved design and maintenance.