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1188 ⏐⏐⏐ SYSTEM ANALYSIS: AN INTRODUCTION<br />

+<br />

E i1<br />

–<br />

I i1<br />

+<br />

E i<br />

–<br />

I i<br />

A v1 = –12<br />

A i1 = 4<br />

Z i1 = 1 k�<br />

SECTION 26.5 Cascaded Systems<br />

15. For the two-stage system of Fig. 26.67:<br />

a. Determine the total voltage gain AvT � VL/Ei. b. Find the total current gain AiT � Io/Ii. c. Find the current gain of each stage Ai1 and Ai2 .<br />

d. Determine the total current gain using the results of<br />

part (c), and compare it to the result obtained in part (b).<br />

Av1 = –30 Av2 = –50 Eo RL = 8 k� VL –<br />

–<br />

Z i1 = 1 k� Z i2 = 2 k�<br />

FIG. 26.67<br />

Problem 15.<br />

A v2 = ?<br />

A i2 = 26<br />

Z i2 = ?<br />

FIG. 26.68<br />

Problem 16.<br />

+<br />

I o<br />

*16. For the system of Fig. 26.68:<br />

a. Determine A v2 if A vT ��6912.<br />

b. Determine Z i2 using the information provided.<br />

c. Find A i3 and A iT using the information provided in<br />

Fig. 26.68.<br />

SECTION 26.6 Impedance (z) Parameters<br />

17. a. Determine the impedance (z) parameters for the p<br />

network of Fig. 26.69.<br />

b. Sketch the z-parameter equivalent circuit (using either<br />

form of Fig. 26.32).<br />

+<br />

E 1<br />

–<br />

I 1<br />

A v3 = –32<br />

A i3 = ?<br />

Z i3 = 2 k�<br />

Z 1<br />

Z 2<br />

+<br />

I o3<br />

Z 3<br />

FIG. 26.69<br />

Problems 17 and 21.<br />

+<br />

Eo3 RL –<br />

2.2 k�<br />

I 2<br />

+<br />

E 2<br />

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