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1. CIRCUIT TERMINOLOGY CIRCUITS by Ulaby & Maharbiz.

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Presentation on theme: "1. CIRCUIT TERMINOLOGY CIRCUITS by Ulaby & Maharbiz."— Presentation transcript:

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

8

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: Determine: (a) q(t) (b) Solution:

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: Determine: Solution: Source is CCVS

26 Tech Brief 2: Moore’s Law

27 Challenges to Continuation of Moore’s Law  Heat dissipation  Size (approaching atomic dimensions)

28 Summary


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