Electronics Technology Fundamentals

1
Electronics Technology Fundamentals

• Chapter 7
• Circuit Analysis Techniques

2
Superposition P1

• Superposition Theorem the response of a circuit
  to more than one source can be determined by
  analyzing the circuits response to each source
  (alone) and then combining the results

Insert Figure 7.2
3
Superposition P2
Insert Figure 7.3
4
Superposition P3

• Analyze Separately, then Combine Results

Insert Figure 7.4
5
Voltage and Current Sources P1
Insert Figure 7.7
6
Voltage and Current Sources P2
Insert Figure 7.8
7
Voltage and Current Sources P3
Insert Figure 7.9
8
Voltage and Current Sources P4

• Equivalent Voltage and Current Sources for
  every voltage source, there exists an equivalent
  current source, and vice versa

Insert Figure 7.11
9
Load Analysis

• A means of predicting how the circuit will
  respond to a change load resistance.
  
• Load analysis of series-parallel circuits could
  be long and tedious (and prone to error).
  
• Applying Thevenins Theorem can greatly simplify
  the load analysis of complex circuits.

10
Thevenins Theorem P1

• Thevenins Theorem any resistive circuit or
  network, no matter how complex, can be
  represented as a voltage source in series with a
  source resistance

Insert Figure 7.15
11
Thevenin Equivalent Circuit

• Produces the same output values as the original
  circuit for any given value of load resistance.
  

12
Thevenins Theorem P2

• Thevenin Voltage (VTH) the voltage present at
  the output terminals of the circuit when the load
  is removed

Insert Figure 7.18
13
Thevenins Theorem P3

• Thevenin Resistance (RTH) the resistance
  measured across the output terminals with the
  load removed

Insert Figure 7.21
14
Applications of Thevenins Theorem P1

• Load Voltage Ranges Thevenins theorem is most
  commonly used to predict the change in load
  voltage that will result from a change in load
  resistance
• Maximum Power Transfer
• Maximum power transfer from a circuit to a
  variable load occurs when the load resistance
  equals the source resistance
  
• For a series-parallel circuit, maximum power
  occurs when RL RTH

15
Applications of Thevenins Theorem P3

• Multiload Circuits

Insert Figure 7.30
16
Applications of Thevenins Theorem P4

• Bridge Circuits

Insert Figure 7.32
17
Applications of Thevenins Theorem P5

• Bridge Circuits (Continued)

Insert Figure 7.33
18
Nortons Theorem P1

• Nortons Theorem any resistive circuit or
  network, no matter how complex, can be
  represented as a current source in parallel with
  a source resistance

Insert Figure 7.34
19
Nortons Theorem P2

• Norton Current (IN) the current through the
  shorted load terminals

Insert Figure 7.35
20
Nortons Theorem P3

• Norton Resistance (RN) the resistance measured
  across the open load terminals (measured and
  calculated exactly like RTH)

21
Nortons Theorem P4

• Norton-to-Thevenin and Thevenin-to-Norton
  Conversions

Insert Figure 7.39