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ECE 8053 – Project Fall’02. Design of 64-bit Low Power Spanning Tree Carry Lookahead Adder Presented by Suderson Soundararajan. Overview. Introduction Design Optimization for Power Optimization for Performance Optimization for Area Usage of CAD tools

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Ece 8053 project fall 02

ECE 8053 – Project Fall’02

Design of 64-bit Low Power Spanning Tree Carry Lookahead Adder

Presented by

Suderson Soundararajan


Overview
Overview

  • Introduction

  • Design

  • Optimization for Power

  • Optimization for Performance

  • Optimization for Area

  • Usage of CAD tools

  • Presentation of Results and Comparison

  • Summary and Conclusion

  • References



Optimization for power
Optimization for Power

  • Low Power and High Performance Full Adder Cell

Full Adder Cell – A Novel High Performance CMOS 1-bit Full Adder cell,

Ahmed M.Shams, Bayoumi, M.A


Optimization for speed
Optimization for Speed

  • Domino!

  • Two-Phase Clock – Generated using Chopper Circuit


Optimization for speed contd

MCC – Group Propagate Signal Generation

MCC – Group Generate Signal Generation

Optimization for Speed Contd..


Optimization for area
Optimization for Area

4-bit Carry Select Adder - Youngjoon Kim; Lee-Sup Kim. “A Low Power Carry Select adder with Reduced Area”

Less Number of Transistors => Less Area


Delay and power dissipation

MCC Blocks

MCC3

MCC2

Delay

420 ps

300 ps

Power

15 uW

11 uW

Delay and Power Dissipation


Usage of cad tools
Usage of CAD tools

  • Functionality Verification -

    Gate Level Verilog – ModelSim

  • Synthesis -

    Flattened Netlist – Synopsys

  • Transistor Level Simulation and Testing -

    Netlist - Cadence Spectre


Results
Results

Comparison


Conclusion
Conclusion

  • Achieved Low Power and High Performance compared to the conventional one

  • Can still optimize for Power – Carry Lookahead Scheme

  • Can still optimize for Speed – Sizing!


References
References

  • Thomas Lynch, Earl E.Swartzlander, “A Spanning Tree Carry Lookahead Adder,” IEEE transactions, Vol 41, No.8, August 1992.

  • Jeffrey Blackburn, Lisa Amdt, Earl E.Swartzlander, “Optimization of Carry Lookahead Adders”, 1997, IEEE transactions.

  • Ahmed M.Shams, Bayoumi, M.A, “A Novel High Performance CMOS 1-bit Full Adder Cell”, IEEE transactions, Vol.47, No.5, May’2000.

  • Youngjoon Kim; Lee-Sup Kim. “A Low Power Carry Select adder with Reduced Area, Circuits and Systems,” ISCAS 2001. The 2001 IEEE International Symposium on, Volume: 4, 2001 Page(s): 218 –221


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