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1190 ⏐⏐⏐ SYSTEM ANALYSIS: AN INTRODUCTION<br />

E g<br />

R g<br />

+<br />

–<br />

1 k�<br />

Z i<br />

I 1<br />

+<br />

E 1<br />

–<br />

(z 11 )<br />

1 k�<br />

+<br />

5 � 10<br />

(z12I2 )<br />

–<br />

3 ∠90°I2 FIG. 26.74<br />

Problems 27, 32, and 34.<br />

SECTION 26.9 Input and Output Impedances<br />

26. For the hybrid equivalent circuit of Fig. 26.73:<br />

a. Determine the input impedance.<br />

b. Determine the output impedance.<br />

27. Determine the input and output impedances for the zparameter<br />

equivalent circuit of Fig. 26.74.<br />

(z 22 )<br />

10 � 103 2 k� 4 k�<br />

+<br />

I1 (z21I1 )<br />

–<br />

+<br />

I 2<br />

E 2<br />

Z o<br />

–<br />

R L<br />

1 k�<br />

28. Determine the expression for the input and output impedance<br />

of the y-parameter equivalent circuit.<br />

SECTION 26.10 Conversion between Parameters<br />

29. Determine the h parameters for the following z parameters:<br />

z11 � 4 k�<br />

z12 � 2 k�<br />

z21 � 3 k�<br />

z22 � 4 k�<br />

30. a. Determine the z parameters for the following h parameters:<br />

h11 � 1 k�<br />

h12 � 2 � 10 �4<br />

h21 � 100<br />

h22 � 20 � 10 �6 S<br />

b. Determine the y parameters for the hybrid parameters<br />

indicated in part (a).<br />

SECTION 26.11 Computer Analysis<br />

PSpice or Electronics Workbench<br />

31. For E1 � 4V�30°, determine E2 across a 2-k� resistive<br />

load between 2 and 2′ for the network of Fig.<br />

26.34.<br />

32. For Eg � 2 V �0°, determine E2 for the network of Fig.<br />

26.74.<br />

33. Determine Zi for the network of Fig. 26.34 with a 2-k�<br />

resistive load from 2 to 2′.<br />

34. Determine Zi for the network of Fig. 26.74.

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