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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

Emitter-Coupled Logic

Dr. T.Y. Chang

NTHU EE

2006.11.2

introduction
Introduction
  • Basic Principle
  • The ECL Family

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

basic principle
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
Emitter-Coupled BJT
  • v1 (v2 +0.12V) Q1 on Q2 off
  • v2 (v1 +0.12V) Q2 on Q1 off
reference circuit
Reference Circuit

Vγ=0.75V

i=0

VR=-1.32V

high speed connections
High-Speed Connections
  • Properly terminating the transmission line
    • eliminates the “ringing”
    • otherwise corrupt the logic signals
thermal effect v r
Thermal Effect (VR)
  • Equivalent circuit for determining the temperature coefficient of the reference voltage VR
thermal effect v ol
Thermal Effect (VOL)
  • Equivalent circuit for determining the temperature coefficient of VOL
thermal effect v oh
Thermal Effect (VOH)
  • Equivalent circuit for determining the temperature coefficient of VOH