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Interconnect Modeling and Optimization for NSoLT (NearSpeed of Light Transmission)in Future Technologies

Rasekh, Amin | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47661 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Sarvari, Reza
  7. Abstract:
  8. Several advantages and problems associated with technology scaling. One of the most important problems facing technology scaling is interconnects. As technology scales down wire delay becomes dominant. Optical interconnects has been subject of many researches for more than two decades to overcome this problem. The key idea behind near speed of light transmission (NSoLT) is that for buffers at the end of ITRS projections input capacitances could be as small as tens of atto Farads. Hence, voltage of the end of global wires could jump at the time of flight.
    In this project, a global wire has been divided in to k segments in a way that data can be transferred with the speed close to the speed of light. If the added delay due to the buffers be smaller than the speed of light for each segment, the goal of transferring data at NSoLT is achieved.
    Unlike conventional buffer insertion techniques which is based on RC delay models for wires, we consider distributed RLC model for transmission lines. Each line divided into k segments which is derived with n cascaded buffers each with h ratio between them. Optimal value for k,n and h is calculated by swiping on different values of these parameters. The results shows that for a 38mm global wire at 7nm FinFet technology this technique results in 98.38% improvement compared to no buffer inserted. It shows that the delay is as small as 1.355 times ideal ToF of the line. We also consider process variation using Monte Carlo statistical method and showed that maximum error in the optimized case is only 2.45% which shows as most of the delay is dominated by ToF at the line it is very robust
  9. Keywords:
  10. Data Transmission ; Buffers ; Time of Flight ; Electrical Interconnect ; Light Speed

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