Question 4 Consider a BJT amplifier circuit in Figure 4. Assume that BDC = 110, Bac- 100 remains constant during the operating conditions and Ri-2 k2. Vec +30V Rc 3 ka Vout 20kf? 10uF Vin o R 2k 10 pF Skn Re 1 ka 10 F Figure 4 (a) Draw the de and ac equivalent circuit for the BIT amplifier circuit. (b) Calculate the following values for the amplifier: Va, Vi, In, r'e, Rintue, Rusun, and A. (c) Evaluate the effect to the voltage gain if the bypass capacitor C2 and load resistor R is removed from the amplifier.

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Question 4
Consider a BJT amplifier cireuit in Figure 4. Assume that BDC = 110, Bac- 100 remains constant
during the operating conditions and Ri =2 k2.
Vec
+30V
Rc
3 kn C,
Vout
R
20k
10uF
Vin o
10 uF
R
2kn
R:
Skn
RE
1 ka
10 uF
Figure 4
(a) Draw the de and ac equivalent cireuit for the BJT amplifier circuit.
(b) Calculate the following values for the amplifier: Va, Vr, Ir, r'e, Riche Ruun, and A.
(e) Evaluate the effect to the voltage gain if the bypass capacitor C2 and load resistor R, is removed
from the amplifier.
(d) Modify the circuit in Figure 4 to minimize the effect of r'e without reducing the voltage gain to
its minimum value.
Transcribed Image Text:Question 4 Consider a BJT amplifier cireuit in Figure 4. Assume that BDC = 110, Bac- 100 remains constant during the operating conditions and Ri =2 k2. Vec +30V Rc 3 kn C, Vout R 20k 10uF Vin o 10 uF R 2kn R: Skn RE 1 ka 10 uF Figure 4 (a) Draw the de and ac equivalent cireuit for the BJT amplifier circuit. (b) Calculate the following values for the amplifier: Va, Vr, Ir, r'e, Riche Ruun, and A. (e) Evaluate the effect to the voltage gain if the bypass capacitor C2 and load resistor R, is removed from the amplifier. (d) Modify the circuit in Figure 4 to minimize the effect of r'e without reducing the voltage gain to its minimum value.
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