Find an estimate for the lower and upper cut-off frequencies for the amplifier circuit shown in Figure Q4. The device capacitances for the transistors are: Chel = 30 pF, Ce1 = 2 pF, Cel = 0.1 pF, Che2 = 20 pF, Che2 = 1 pF and Cee2 = 0.25 pF. Use B = 100 for both transistors in your calculations. The small signal model parameters for the transistors are: Tg1 = 2 k2, gml = 50 mS, r2 = 4 kN, gm2 = 25 mS, For the low-frequency: = where Tps are the time constants for the capacitors. For the high-frequency: Vc 14 V Rs 5.6 kn 180 pF RE R, 68 k 5.6 kN 3905 2N Qi 3903 R IS uF 68 k2 0.47 uF 600n 220n R 40 ka R3 47 ka. R. 5.6 ksa 4.7 k Figure Q4

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Q4.
Find an estimate for the lower and upper cut-off frequencies for the amplifier circuit shown in
Figure Q4.
The device capacitances for the transistors are:
Chel = 30 pF, Chel = 2 pF, Cel = 0.1 pF, Che2 = 20 pF, Che2 = 1 pF and Cee2 = 0.25 pF.
Use B = 100 for both transistors in your calculations.
The small signal model parameters for the transistors are:
Tal = 2 k2, gml = 50 mS, r-2 = 4 kN, gm2 = 25 mS,
%3D
For the low-frequency: @
where Tpß are the time constants for the capacitors.
For the high-frequency:
Vc
14 V
C,
Rs
5.6 kn
180 uF
R
R,
68 k
Q, 2N
3905
5.6 kN
|2N
Qi 3903
1S µF
R
U,
68 k2
0.47 uF
600 n
220 n
R
40 ka
R
47 ka
8 uF
5.6 ksa
4.7 ka
Figure Q4
Transcribed Image Text:Q4. Find an estimate for the lower and upper cut-off frequencies for the amplifier circuit shown in Figure Q4. The device capacitances for the transistors are: Chel = 30 pF, Chel = 2 pF, Cel = 0.1 pF, Che2 = 20 pF, Che2 = 1 pF and Cee2 = 0.25 pF. Use B = 100 for both transistors in your calculations. The small signal model parameters for the transistors are: Tal = 2 k2, gml = 50 mS, r-2 = 4 kN, gm2 = 25 mS, %3D For the low-frequency: @ where Tpß are the time constants for the capacitors. For the high-frequency: Vc 14 V C, Rs 5.6 kn 180 uF R R, 68 k Q, 2N 3905 5.6 kN |2N Qi 3903 1S µF R U, 68 k2 0.47 uF 600 n 220 n R 40 ka R 47 ka 8 uF 5.6 ksa 4.7 ka Figure Q4
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