Emitter-Coupled Logic

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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

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
• Ref. Vcc=0
• VOH=0
• VOL=－I RC
• Level-shifter required
• Complementary output available
Emitter-Coupled BJT
• v1 (v2 +0.12V) Q1 on Q2 off
• v2 (v1 +0.12V) Q2 on Q1 off
Reference Circuit

Vγ=0.75V

i=0

VR=－1.32V

High-Speed Connections
• Properly terminating the transmission line
• eliminates the “ringing”
• otherwise corrupt the logic signals
Thermal Effect (VR)
• Equivalent circuit for determining the temperature coefficient of the reference voltage VR
Thermal Effect (VOL)
• Equivalent circuit for determining the temperature coefficient of VOL
Thermal Effect (VOH)
• Equivalent circuit for determining the temperature coefficient of VOH