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Emitter-Coupled Logic. Dr. T.Y. Chang NTHU EE 2006.11.2. Introduction. Basic Principle The ECL Family D.A. Neamen, Electronic Circuits Analysis And Design, 2nd ed. Chapters 17. Basic Principle. Less susceptible to picked-up noise Common-mode Rejection Const I during switching

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Emitter coupled logic l.jpg

Emitter-Coupled Logic

Dr. T.Y. Chang

NTHU EE

2006.11.2


Introduction l.jpg
Introduction

  • Basic Principle

  • The ECL Family

    D.A. Neamen, Electronic Circuits Analysis And Design, 2nd ed. Chapters 17.


Basic principle l.jpg
Basic Principle

  • Less susceptible to picked-up noise

    • Common-mode Rejection

  • Const I during switching

  • Ref. Vcc=0

    • VOH=0

    • VOL=-I RC

  • Level-shifter required

  • Complementary output available


Emitter coupled bjt l.jpg
Emitter-Coupled BJT

  • v1 (v2 +0.12V) Q1 on Q2 off

  • v2 (v1 +0.12V) Q2 on Q1 off



Reference circuit l.jpg
Reference Circuit

Vγ=0.75V

i=0

VR=-1.32V


High speed connections l.jpg
High-Speed Connections

  • Properly terminating the transmission line

    • eliminates the “ringing”

    • otherwise corrupt the logic signals






Thermal effect v r l.jpg
Thermal Effect (VR)

  • Equivalent circuit for determining the temperature coefficient of the reference voltage VR


Thermal effect v ol l.jpg
Thermal Effect (VOL)

  • Equivalent circuit for determining the temperature coefficient of VOL


Thermal effect v oh l.jpg
Thermal Effect (VOH)

  • Equivalent circuit for determining the temperature coefficient of VOH



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