mith College Computer Science CSC270 Spring 16 Circuits and Systems Lecture Notes Week 3 Dominique Thiébaut

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1 mith College Computer Science CSC270 Spring 16 Circuits and Systems Lecture Notes Week 3 Dominique Thiébaut

2 Crash Course in Electricity and Electronics

3 Zero Physics background expected!

4 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits

5 Main Concepts: Difference in Potentials vs. Intensity

6 An Analogy Hoover Dam

7 An Analogy Hoover Dam Difference in Potentials Intensity

8 An Analogy Hoover Dam Difference in Potentials Resistance Intensity

9 An Analogy Hoover Dam Difference Resistance in Potentials Intensity =0

10 An Analogy Hoover Dam Difference in Potentials Intensity

11 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits

12 Observations Resistance Intensity Resistance oo x Intensity 0 High difference in potentials Intensity Low difference in potentials Intensity

13 Observations Resistance Intensity Resistance oo x Intensity 0 High difference in potentials Intensity Low difference in potentials Intensity

14 Observations Resistance Intensity Resistance oo x Intensity 0 High difference in potentials Intensity Low difference in potentials Intensity

15 Observations Resistance Intensity Resistance oo x Intensity 0 High difference in potentials Intensity Low difference in potentials Intensity

16 Observations Resistance Intensity Resistance oo x Intensity 0 High difference in potentials Intensity Low difference in potentials Intensity

17 Another Analogy

18 Another Analogy Difference in Pressure

19 Another Analogy Difference in Pressure No resistance in the pipe no difference in pressure

20 Another Analogy Resistance Difference in Pressure

21 Another Analogy Resistance Difference in Pressure

22 Observations Keeping Intensity constant, Resistance Difference in Potentials

23 + - R

24 + - R

25 I current Power Supply + - V voltage R Resistance Ground

26 Assumptions An electrical wire has no resistance A closed switch has no resistance An open switch has infinite resistance The current flowing in a closed-loop circuit is the same everywhere.

27 I current Power Supply + - V voltage R Resistance Ground

28 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits

29 Ohm s Law Voltage = Resistance * Intensity V = R. I

30 Ohm s Law Voltage = Resistance * Intensity V = R. I Volt Ohm Amp V Ω A

31 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits

32 What is I? I 5V + - V voltage R 1 KΩ Ground

33 What are I, I1, I2? I 5V + - I2 R2 1 KΩ I1 R1 1 KΩ Ground

34 What is I? 5V + - I R1 1 KΩ R2 4 KΩ Ground

35 What are V1, V2? 5V + I V1 R1 1 KΩ - V2 R2 4 KΩ Ground

36 What are V1, V2? 5V + I V1 R1 1 KΩ - V2 R2 4 KΩ Ground

37 What is I? 5V + - R1 3 KΩ R2 7 KΩ I Ground

38 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits

39 What does R look like?

40

41 What values?

42 Simplification I 5V + - V voltage R 1 KΩ Ground

43 Simplification +5V R 1 KΩ

44 How Does that Apply to Us? 1 x

45 How Does that Apply to Us? +5V 1 x x

46 We stopped here last time

47 How Does that Apply to Us? x 0

48 How Does that Apply to Us? x 0 x 0

49 Exercise +5V 2-to-4 A1 Y0' Y What is Y(a)? a A0 Y1' NC Y2' NC E' Y3' NC

50 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits

51 Meet The Diode

52 Diode = semiconductor

53 R1 1 KΩ + - P N

54 R1 1 KΩ + - P N

55 R1 1 KΩ + - N P

56 R1 1 KΩ + - N P

57 Symbol R1 1 KΩ + - P N

58 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits

59 Meet the Transistor

60 R1 1 KΩ C + - N P N B R2 10 KΩ + - E Collector Base Emitter

61 R1 1 KΩ C + - N P N B R2 10 KΩ V E Collector Base Emitter

62 R1 1 KΩ C + - N P N B R2 10 KΩ + - E Collector Base Emitter

63 R1 1 KΩ C + - N P N B R2 10 KΩ V E Collector Base Emitter

64 Symbol R1 1 KΩ + C B R2 - E 10 KΩ + - Collector Base Emitter

65 Symbol R1 1 KΩ + C B R2 - E 10 KΩ + - Collector Base Emitter

66 What is f(a)? Quiz 1 KΩ a KΩ f 2N2222

67 A Real TTL Circuit

68 A Real TTL Circuit

69 A Real TTL Circuit

70 A Real TTL Circuit

71 What is h(a,b)? Quiz 1 KΩ 1 KΩ a b 10 KΩ 10 KΩ h

72 Hydrodynamic Analogy Outline Resistance, Intensity, Difference in Potentials Ohm's Law Exercises: solving electrical circuits Resistors Diode Transistor Practical Circuits

73 Practical Design Rules for Discrete Parts

74 Input Switch 1 KΩ

75 Logic Indicator R 04

76 Logic Indicator What s a good value? R 04

77 Logic Indicator What s a good value? R 04

mith College Computer Science CSC270 Spring 16 Circuits and Systems Lecture Notes Week 2 Dominique Thiébaut

mith College Computer Science CSC270 Spring 16 Circuits and Systems Lecture Notes Week 2 Dominique Thiébaut mith College Computer Science CSC270 Spring 16 Circuits and Systems Lecture Notes Week 2 Dominique Thiébaut dthiebaut@smith.edu Lab 1: Lessons Learned a0 b0 adder c0 S0 a1 b1 a0 b0 adder adder S1 S0 a31

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