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1. Circuit Terminology

1. Circuit Terminology. CIRCUITS by Ulaby & Maharbiz. Overview. Chapter 1: Circuit Terminology. Electronics Devices – active vs. passive Circuits Systems. Cell-Phone Architecture. Units, Multiples, Notation. Tech Brief 1: Micro- and Nanotechnology.

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1. Circuit Terminology

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  1. 1. Circuit Terminology CIRCUITS by Ulaby & Maharbiz

  2. Overview

  3. Chapter 1: Circuit Terminology • Electronics • Devices – active vs. passive • Circuits • Systems

  4. Cell-Phone Architecture

  5. Units, Multiples, Notation

  6. Tech Brief 1: Micro- and Nanotechnology

  7. Tech Brief 1: Micro- and Nanotechnology

  8. Tech Brief 1: Micro- and Nanotechnology

  9. Charge & Current • Unit of charge = coulomb

  10. Electron Drift Response time = 0.2 microsecond Actual travel time = 10 days!!

  11. Current

  12. Example 1-1: Charge Transfer • Given: Solution: Determine: (a) q(t) (b)

  13. Example 1-1: Charge Transfer (cont.) (b)

  14. Voltage & Power

  15. Reference/Ground • Choose reference point for potential • Assign potential at reference = 0, called ground • Now all potentials are relative to ground terminal

  16. Measuring Voltage & Current • Voltmeter: measures voltage without drawing current • Ammeter: measures current without dropping voltage

  17. Open Circuit & Short Circuit • Open circuit: no path for current flow (R = ) • Short circuit: no voltage drop (R = 0)

  18. Power Rate of expending or absorbing energy Energy conservation Units: watts One watt = power rate of one joule of work per second. 1 W = 1 A x 1 V

  19. Passive Sign Convention

  20. Example 1-4: Energy Consumption • Given:Resistor consuming 20 W before switch turned off at t = 0. Also • Determine: Total energy consumed by resistor after t = 0. • Solution: (before t = 0)

  21. Circuit Elements: Independent Sources

  22. Circuit Elements: Dependent Sources

  23. I-V for Sources • Current/voltage fixed for independent sources • What does a non-ideal source look like? • Dependent sources vary with reference voltage/current • What are units for slope?

  24. Equivalent Circuit Using Dependent Source

  25. Example 1-5: Dependent Source • Given: Source is CCVS Determine: Solution:

  26. Tech Brief 2: Moore’s Law

  27. Tech Brief 2: Moore’s Law • Challenges to Continuation of Moore’s Law • Heat dissipation • Size (approaching atomic dimensions)

  28. Summary

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