EE3350 Electronics I Laboratory Assignment
Lab 1
“Voltage and Current Sources, Thevenin’s and Norton Theorems
and Introduction to Diodes”
Student Name:
Date: 9/9/2013
Objective:
The lab 1 contains 3 sections,



Voltage and Current Sources
Thevenin’s and Norton Theorems
Introduction To Diodes
After completing these sections students should be able to



Understand voltage and current sources
o Independent sources
o Dependent sources
o Source resistance
o Resistance match for maximum power transfer
Understand Thevenin’s and Norton theorem
o Thevenin’s equivalent circuit
o Norton’s equivalent circuit
o Source transformation
Understand basics of diodes
o Forward bias
o Reverse bias
o Ideal diodes
o Barrier voltage
o Breakdown voltage and avalanche breakdown
o Diode datasheet
PART I -) Voltage and Current Sources
a. Constant voltage and current sources.
Please construct the circuit shown in figure 1a and 1b using Multisim.
Rs
50
V1
10 V
I1
1A
RL
Figure 1a. Constant voltage source with 50Ω source resistance
Rs
1M
RL
Figure 1b. Constant current source with 1MΩ source resistance
Complete the tables below using Multisim and draw load vs. load resistance graphs (Stiff region).
Table 1.a Load voltage measurements for Figure 1.a
RL (Ohms)
VRL
Table 1.b Load current measurements for Figure 1.a
RL (Ohms)
0
0
50
1,000
100
10,000
1000
100,000
5000
1,000,000
50000
10,000,000
IRL
VRL
RL
Figure 2. Graph using table 1a. Show the stiff region.
IRL
RL
Figure 3. Graph using table 1b. Show the stiff region.
b. Voltage Controlled Voltage Source (VCVS).
Please construct the circuit shown in figure 1a and 1b using Multisim.
R2
1k
R3
1k
V1
10 V
V2
2 V/V
Figure 4. Voltage controlled voltage source.


What is the multiplier (k)?
Write V2 in terms of VR3.

Complete the table below using Multisim.
Table 2. Voltage measurements for Figure 4
R3 (kΩ)
1
2
3
4
5
VR3
VR1
R1
1k
PART II -) Thevenin’s and Norton’s Theorems
a. Thevenin’s Theorem.
Please construct the circuit shown in figure 5.
I2
R3
V3
R1
1k
1k
R2
1k
10 V
1mA
R10
1k
R5
2k
R4
4k
R8
3k
V2
10 V
V1
10 V
I1
20mA
R7
R6
2k
R9
1k
3k
I3
1mA
R11
R13
3k
1k
R12
4k
RL
Figure 5. Circuit with variable RL
Measure the Thevenin’s equivalent of the circuit in Figure 5. Using the circuit determine the RL for maximum power transfer.
Rth
Vth
RL
Figure 6. Thevenin’s equivalent of the circuit in figure 5.
After measure the values of Rth and Vth please put the circuits in figure 5 and in figure 6 side by side in Multisim and complete the table below.
Table 3. Thevenin’s Theorem verification
RL (kΩ)
VRL (Figure 5)
VRL (Figure 5)
1
1.7
2.2
4.7
5.2
6.7
b. Norton’s Theorem.
Using the figure 5 using Multisim. Measure Rn and In using Multisim and complete the Norton’s equivalent of
the circuit below.
In
Rn
RL
Figure 7. Norton’s equivalent of the circuit in figure 5.
c. Source Transformation.
Using the Figure 6 and source transformation calculate the In and Rn. Compare your result with Figure 7.
In
Rn
Figure 7. Norton’s equivalent of the circuit in figure 5.
RL
PART III -) Basic Diode Circuit
a. Forward Bias.
Please construct the circuit shown in figure 8.
D2
1N4148
R1
V1
1k
Figure 8. Forward Biased Diode
Complete the table 4 below using Multisim and draw the ID vs V1 graph.
Table 4. Load voltage measurements for Figure 8.
V1 (Volts)
ID (mA)
0
0.2
0.5
0.7
1.5
2.5
7
12
ID
V1
Figure 9. Graph using table 4.
b. Reverse Bias.
Please construct the circuit shown in figure10.
D2
1N4148
R1
V1
1k
Figure 10. Reverse Biased Diode
Complete the table 5 below using Multisim and draw the ID vs V1 graph.
Table 5. Load voltage measurements for Figure 10
V1 (Volts)
ID (mA)
0
10
20
40
60
100
200
400
V1
ID
Figure 11. Graph using table5.