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10. For the system of Fig. 26.65(a), the no-load output voltage<br />

is �1440 mV, with 1.2 mV applied at the input terminals.<br />

In Fig. 26.65(b), a 4.7-k� load is applied to the<br />

same system, and the output voltage drops to �192 mV,<br />

with the same applied input signal. What is the output<br />

impedance of the system?<br />

+<br />

Ei = 1.2 mV System Eo = –1440 mV<br />

–<br />

(a)<br />

*11. For the system of Fig. 26.66, if<br />

Av ��160 Io � 4 mA �0° Eg � 70 mV �0°<br />

a. Determine the no-load voltage gain.<br />

b. Find the magnitude of Ei. c. Determine Zi. E g<br />

+<br />

–<br />

R g<br />

+<br />

–<br />

0.4 k�<br />

SECTION 26.4 The Current Gains Ai and AiT , and<br />

the Power Gain AG 12. For the system of Fig. 26.64:<br />

a. Determine Ai � Io/Ii. b. Find AiT � Io/Ig. c. Compare the results of parts (a) and (b), and explain<br />

why the results compare as they do.<br />

13. For the system of Fig. 26.64:<br />

a. Determine AG using Eq. (26.13), and compare the<br />

value with the result obtained using Eq. (26.14).<br />

b. Find AGT using Eq. (26.16), and compare the value to<br />

the result obtained using Eq. (26.17).<br />

14. For the system of Fig. 26.66:<br />

a. Determine the magnitude of Ai � Io/Ii. b. Find the power gain AGT � PL/Pg. I i<br />

+<br />

E i<br />

–<br />

+<br />

E i = 1.2 mV<br />

FIG. 26.65<br />

Problem 10.<br />

Z i<br />

Av = –160<br />

Zi = 0.75 k�<br />

FIG. 26.66<br />

Problems 11 and 14.<br />

System<br />

(b)<br />

+<br />

E o<br />

–<br />

I o<br />

R L<br />

2 k�<br />

+<br />

E o<br />

–<br />

PROBLEMS ⏐⏐⏐ 1187<br />

+<br />

4.7 k� VL = –192 mV<br />

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