Ultra-Low Voltage Circuits and
Download
1 / 25

Outline - PowerPoint PPT Presentation


  • 108 Views
  • Uploaded on

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Outline' - peigi


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

Ultra-Low Voltage Circuits andProcessor in 180nm to 90nmTechnologies with aSwapped-Body Biasing TechniqueS. Narendra, J. Tschanz, J. Hofsheier, B. Bloechel,S. Vangal, Y. Hoskote, S. Tang, D. Somasekhar,Microprocessor Research, Intel LabsInstructor : Dr.fakhraeiPresented by : Elaheh RahmaniDate : 83.10.10


Outline
Outline

  • Motivation

  • Forward body bias overview

  • Low-voltage swapped-body concept

  • Measurement results

    -180nm and 130nm test circuits

    -90nm TCP offload processor

  • Summary


Motivation
Motivation:

  • For ultra-low-energy processors, Vcc is

    reduced to improve energy efficiency while

    meeting relaxed frequency targets.

  • However Vcc reduction by conventional

    schemes are limited by:

    (1) Leakage power becoming a larger fraction of total power at low Vcc

    (2) Severe delay degradation below a certain Vcc

    (3) Circuit failure at very low Vcc


Forward body bias fbb
Forward Body Bias (FBB):

  • VB = VS :

    No Body Bias (NBB)

  • VB < VS :

    Forward Body Bias (FBB)


Impact of fbb
Impact of FBB:

VB = VS : VBS = 0 : NBB

VB < VS : VBS < 0 : FBB 􀃎 VTP↓


Lvsb characteristics
LVSB characteristics:

  • LVSB provides FBB value of Vcc

  • In the LVSB mode, changing Vcc produces

    different VT values automatically without

    needing process change

  • But, LVSB is more sensitive to supply and

    ground noise

  • Unlike conventional FBB, LVSB circuits do

    not need body bias generators

  • LVSB circuits has lower VT and better short

    channel effect than NBB


Tcp processor core
TCP processor core:

TCP=Transmission control protocol

TCB=Transmission control block

CLB= connection look up block

ROB= Reorder block



Measurement summary
Measurement summary:

  • LVSB provides FBB value of Vcc without

    body bias generators

  • Compared to NBB, LVSB enables

    – Over 60% frequency improvement at 500mV

    – Over 70mV Vcc reduction for iso-frequency

    – Vccmin reduction of more than 10%

    – Dynamic LVSB reduces standby power to

    NBB while providing active operation benefits


References
References:

  • [1] S.Narendra, J.Tschanz, “Ultra-Low Voltage Circuits and Processor in 180nm to 90nm Technologies with a Swapped-Body Biasing Technique,”2004 IEEE ISSCC.0-7803-8267-6/04

  • [2] Y. Hoskote et al., “A 10GHz TCP Offload Accelerator for 10Gb/s Ethernet in 90nm Dual-Vt CMOS,” ISSCC Dig. Tech. Papers., pp. 258-259, Feb. 2003.

  • [3] S. Narendra et al., “1.1V 1GHz Communications Router with On-Chip Body Bias in 150nm CMOS,” ISSCC Dig. Tech. Papers., pp. 270-271, Feb. 2002.


ad