18. The amplifier in Figure 6-54 has a variable gain control, using a 100 2 potentiometer for Re with the wiper ac-grounded. As the potentiometer is adjusted, more or less of RE is bypassed to ground, thus varying the gain. The total Rg remains constant to dc, keeping the bias fixed. Determine the maximum and minimum gains for this unloaded amplifier. 19. If a load resistance of 600 is placed

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18. The amplifier in Figure 6-54 has a variable gain control, using a 100 2 potentiometer for Re
with the wiper ac-grounded. As the potentiometer is adjusted, more or less of RE is bypassed
to ground, thus varying the gain. The total Rg remains constant to dc, keeping the bias fixed.
Determine the maximum and minimum gains for this unloaded amplifier.
19. If a load resistance of 600 2 is placed on the output of the amplifier in Figure 6-54, what are
the maximum and minimum gains?
Muk Sim
2012 2009
T Spice
FIGURE 6-54
G
10 μF
www
+1₁
R₁
12 ΚΩ
R₂
3.3 ΚΩ
Vcc
+8 V
1₁
Re
330 Ω
RE
PROBLEMS + 313
HE
10 μF
Boc=B=150
100 Ω
C₂
100 μF
AME
Transcribed Image Text:18. The amplifier in Figure 6-54 has a variable gain control, using a 100 2 potentiometer for Re with the wiper ac-grounded. As the potentiometer is adjusted, more or less of RE is bypassed to ground, thus varying the gain. The total Rg remains constant to dc, keeping the bias fixed. Determine the maximum and minimum gains for this unloaded amplifier. 19. If a load resistance of 600 2 is placed on the output of the amplifier in Figure 6-54, what are the maximum and minimum gains? Muk Sim 2012 2009 T Spice FIGURE 6-54 G 10 μF www +1₁ R₁ 12 ΚΩ R₂ 3.3 ΚΩ Vcc +8 V 1₁ Re 330 Ω RE PROBLEMS + 313 HE 10 μF Boc=B=150 100 Ω C₂ 100 μF AME
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