(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?
12.17 If a signal voltage of 10mV rms is applied to each of the following amplifiers, what are the output voltages
and phase relationships with inputs?
Ry
100 kn
330 kn
100 kl
33 kn
R
1.0 MA
1619R
7k0 hael Marceau
(a)
(b)
(c)
(d)
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 =
=
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