(a) Assume the transistor in the source-follower circuit shown in Figure 12.18 ( b ) is biased at I D Q = 250 μ A . Let R S = 3 k Ω . If the transistor parameters are K n = 0.5 mA / V 2 , V T N = 0.8 V , and λ = 0 , determine A v f and R o f . ( b ) Determine the percent change in A v f and R o f if the quiescent drain current is increased to I D Q = 1mA. (Ans. (a) A v f = 0.6796 , R o f = 961 Ω ; (b) A v f : + 19.1 % , R o f : − 40.5 % )
(a) Assume the transistor in the source-follower circuit shown in Figure 12.18 ( b ) is biased at I D Q = 250 μ A . Let R S = 3 k Ω . If the transistor parameters are K n = 0.5 mA / V 2 , V T N = 0.8 V , and λ = 0 , determine A v f and R o f . ( b ) Determine the percent change in A v f and R o f if the quiescent drain current is increased to I D Q = 1mA. (Ans. (a) A v f = 0.6796 , R o f = 961 Ω ; (b) A v f : + 19.1 % , R o f : − 40.5 % )
Solution Summary: The diagram for the small signal model is shown in Figure 1. The value of the gate to source voltage is given by, cV_gs =
(a) Assume the transistor in the source-follower circuit shown in Figure
12.18
(
b
)
is biased at
I
D
Q
=
250
μ
A
.
Let
R
S
=
3
k
Ω
.
If the transistor parameters are
K
n
=
0.5
mA
/
V
2
,
V
T
N
=
0.8
V
,
and
λ
=
0
,
determine
A
v
f
and
R
o
f
.
(
b
)
Determine the percent change in
A
v
f
and
R
o
f
if the quiescent drain current is increased to
I
D
Q
=
1mA. (Ans. (a)
A
v
f
=
0.6796
,
R
o
f
=
961
Ω
;
(b)
A
v
f
:
+
19.1
%
,
R
o
f
:
−
40.5
%
)
If the circuit shown in Figure #1 had a 10 kΩ resistor connected as a load resistor, RL and an input signal is applied to the base of the transistor through the coupling capacitor C1, with an amplitude of 22 mVpp at a frequency of 1 kHz. Determine the new voltage gain AV and the output voltage VOUT. Is the output signal clipped?
1- If you I have the following Q-point specifications
VCB=6V
Ic= 1.4 mA
IB = 10 μA Av = 186
R₁ = 22K0
For the Common Base bias circuit shown in figure (5), design bias
circuit and ensure that the Q-point in the middle of the DC load line
using the required equations. Record the calculated values of the resistors
i.
Vcc=
Iε =
re=
a =
Av =
Rc =
VcB =
VCE =
RE
Vε =
IR1 =
IR2 =
R₂ =
=
(a) Perform a Monte Carlo analysis of the six-stage
cascade amplifier design resulting from the exam-
ple in Tables 12.4 and 12.5, and determine the frac-
tion of the amplifiers that will not meet either the
gain or bandwidth specifications. Assume the resis-
tors are uniformly distributed between their limits.
A, > 100 dB
fu 2 50 kHz
and
(b) What tolerance must be used to ensure that less
than 0.1 percent of the amplifiers fail to meet both
specifications?
The equation here can be used to estimate the
location of the half-power frequency for N closely
spaced poles, where fHi is the average of the indi-
vidual cutoff frequencies of the N stages and f
is the cutoff frequency of the ith individual stage.
fH = FHIV2/N – 1
where THi =E fin
n
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