The cascode circuit in Figure 7.65 has parameters V + = 12 V , V − = 0 , R 1 = 58.8 kΩ , R 2 = 33.3 kΩ R 3 = 7.92 kΩ , R C = 7.5 kΩ , R S = 1 kΩ , R E = 0.5 kΩ , and R L = 2 kΩ . The transistor parameters are: β = 100 , V B E (on)=0 .7V , V A = ∞ , C π = 24 pF , and C μ = 3 pF . Let C L be an open circuit. (a) Determine the 3dB frequencies corresponding to the input and output portions of the equivalent circuit. (b) Calculate the small−signal midband voltage gain. (c) Correlate the results from parts (a) and (b) with a computer analysis. (Ans. (a) f H π = 7.15 MHz , f H μ = 33.6 MHz , (b) | A υ | = 22.5 )
The cascode circuit in Figure 7.65 has parameters V + = 12 V , V − = 0 , R 1 = 58.8 kΩ , R 2 = 33.3 kΩ R 3 = 7.92 kΩ , R C = 7.5 kΩ , R S = 1 kΩ , R E = 0.5 kΩ , and R L = 2 kΩ . The transistor parameters are: β = 100 , V B E (on)=0 .7V , V A = ∞ , C π = 24 pF , and C μ = 3 pF . Let C L be an open circuit. (a) Determine the 3dB frequencies corresponding to the input and output portions of the equivalent circuit. (b) Calculate the small−signal midband voltage gain. (c) Correlate the results from parts (a) and (b) with a computer analysis. (Ans. (a) f H π = 7.15 MHz , f H μ = 33.6 MHz , (b) | A υ | = 22.5 )
Solution Summary: The author explains the 3-dB frequencies for the input and the output proportions.
The cascode circuit in Figure 7.65 has parameters
V
+
=
12
V
,
V
−
=
0
,
R
1
=
58.8
kΩ
,
R
2
=
33.3
kΩ
R
3
=
7.92
kΩ
,
R
C
=
7.5
kΩ
,
R
S
=
1
kΩ
,
R
E
=
0.5
kΩ
, and
R
L
=
2
kΩ
. The transistor parameters are:
β
=
100
,
V
B
E
(on)=0
.7V
,
V
A
=
∞
,
C
π
=
24
pF
, and
C
μ
=
3
pF
. Let
C
L
be an open circuit. (a) Determine the 3dB frequencies corresponding to the input and output portions of the equivalent circuit. (b) Calculate the small−signal midband voltage gain. (c) Correlate the results from parts (a) and (b) with a computer analysis. (Ans. (a)
f
H
π
=
7.15
MHz
,
f
H
μ
=
33.6
MHz
, (b)
|
A
υ
|
=
22.5
)
Listen
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