Circuits II EE221 Unit 2 Instructor: Kevin D. Donohue. Review: Impedance Circuit Analysis with nodal, mesh, superposition, source transformation, equivalent circuits and SPICE analyses. . Equivalent Circuits.
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Review: Impedance Circuit Analysis with nodal, mesh, superposition, source transformation, equivalent circuits and SPICE analyses.
A
Is
Rth
Norton
B
A
Rth
Vs
Thévenin
B
Voltage SourceThéveninCircuit
Current SourceNorton Circuit
What is the Thévenin equivalent for the Norton circuit?
What is the Norton equivalent for the Thévenin circuit?
A
A
Rth
Rth
Isc
Voc
B
B
A
A
A
Rth
Rth
Rth
Vs
Is Rth
Rth
Is
B
B
B
B
A
A
A
A
Rth
Vs
Vs
Is
Is
B
B
B
B
Source Transformation3 k
j3.5 k
6 k
10
1 H
ix
+
vo

0.1 F
vs
2 ix
0.5 H
Show: v0(t) = 13.91cos(4t  161.6º)
+ vc(t) 
3 kW
114.86 nF
vs(t)
6 kW
Analysis ExampleFind the steadystate response for vc(t) when vs(t) = 5cos(800t) V
Can be derived with mesh or nodal analysis or source transformation:
Find the steadystate response for vc(t) when vs(t) = 4cos(200t) V and is(t) = 8cos(500t) A.
10 mH
4W
+vc(t)
5 mF
6 W
vs(t)
is(t)
Can be derived with superposition:
ex16Small Signal AC2Table
FREQ MAG(V(IVM)) PH_DEG(V(IVM))
(Hz) (V) (deg)
+100.000 +3.299 8.213
+200.000 +3.203 16.102
+300.000 +3.059 23.413
+400.000 +2.887 30.000
+500.000 +2.703 35.817
+600.000 +2.520 40.893
+700.000 +2.345 45.295
+800.000 +2.182 49.107
+900.000 +2.033 52.411
+1.000k +1.898 55.285
Linear Magnitude, Log Frequency
dB Magnitude, Log Frequency
dB Magnitude, Linear Frequency
Voltage of interest
Extract Line from table of interest
FREQ MAG(I(VAM)) PH_DEG(I(VAM)) MAG(V(IVM)) PH_DEG(V(IVM))
(Hz)
+636.600m +7.589 +108.440 +13.912 161.560