
452 Network Analysis and Synthesis
10.13 EXAMPLES BASED ON POLE–ZERO PLOT
Some more solved examples on network function are provided in the following.
Example 10.29 A network function is given in the following:
ps
s
sss
()
()
=
+++
2
2
2
Obtain the pole–zero diagram.
Solution: For poles: Substitute the denominator to zero.
That is, (s + 2) (s
2
+ 2s + 2) = 0
⇒ Either s + 2 = 0 or s
2
+2s + 2 = 0
s = -2 or
=
-± -
8
-±
j
s = -1 ± j
Therefore, poles one situated at s = -2, -1 + j, -1 -j
and zeros are situated at s = 0
The pole–zero diagram is shown in Figure 10.50.
Example 10.30 A transformed voltage is given by
s
()
()
=
3
Draw the pole–zero plot ...