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Emitter-Coupled Logic

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

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  1. Emitter-Coupled Logic Dr. T.Y. Chang NTHU EE 2006.11.2

  2. Introduction • Basic Principle • The ECL Family D.A. Neamen, Electronic Circuits Analysis And Design, 2nd ed. Chapters 17.

  3. 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

  4. Emitter-Coupled BJT • v1 (v2 +0.12V) Q1 on Q2 off • v2 (v1 +0.12V) Q2 on Q1 off

  5. Basic ECL Circuit

  6. Reference Circuit Vγ=0.75V i=0 VR=－1.32V

  7. High-Speed Connections • Properly terminating the transmission line • eliminates the “ringing” • otherwise corrupt the logic signals

  8. Simplified ECL Circuit

  9. ECL OR Characteristics

  10. Find VOH

  11. ECL NOR Characteristics

  12. Thermal Effect (VR) • Equivalent circuit for determining the temperature coefficient of the reference voltage VR

  13. Thermal Effect (VOL) • Equivalent circuit for determining the temperature coefficient of VOL

  14. Thermal Effect (VOH) • Equivalent circuit for determining the temperature coefficient of VOH

  15. Wired-OR

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