The bias voltages of the circuit shown in Figure P7.67 are changed to V + = 3 V and V − = − 3 V . The input resistances are R i = 4 kΩ and R G = 200 kΩ . The transistor parameters are K P =0 .5mA/V 2 , V T P = − 0.5 V , λ = 0 , C g s = 0.8 pF , and C g d = 0.08 pF . (a) Design the circuit such that I D Q =0 .5mA and V S D Q = 2 V . (b) Find the midband voltage gain. (c) Determine the equivalent Miller capacitance. (d) Find the upper 3dB frequency.
The bias voltages of the circuit shown in Figure P7.67 are changed to V + = 3 V and V − = − 3 V . The input resistances are R i = 4 kΩ and R G = 200 kΩ . The transistor parameters are K P =0 .5mA/V 2 , V T P = − 0.5 V , λ = 0 , C g s = 0.8 pF , and C g d = 0.08 pF . (a) Design the circuit such that I D Q =0 .5mA and V S D Q = 2 V . (b) Find the midband voltage gain. (c) Determine the equivalent Miller capacitance. (d) Find the upper 3dB frequency.
Solution Summary: The author explains the design parameters of the circuit. Input resistances are given by, lR_i=4kOmega
The bias voltages of the circuit shown in Figure P7.67 are changed to
V
+
=
3
V
and
V
−
=
−
3
V
. The input resistances are
R
i
=
4
kΩ
and
R
G
=
200
kΩ
. The transistor parameters are
K
P
=0
.5mA/V
2
,
V
T
P
=
−
0.5
V
,
λ
=
0
,
C
g
s
=
0.8
pF
, and
C
g
d
=
0.08
pF
. (a) Design the circuit such that
I
D
Q
=0
.5mA
and
V
S
D
Q
=
2
V
. (b) Find the midband voltage gain. (c) Determine the equivalent Miller capacitance. (d) Find the upper 3dB frequency.
5. Determine Leq at terminal a-b the circuit below. Ans.7.778 mH
10 mH
60 mH
25 mH
20 mH
a o
o b
ele
30 mH
Draw the small signal equivalent circuit of the following circuit.
Note that C1 and C2 are large AC coupling capacitors.
5
VIO
C1
RF
Q1
C2
fem
RL
Vo
(c)
A 2400 V, 1000 KVA, 0.85 power factor (PF) lagging, 50 Hz six-poles, Y-connected
synchronous generator has a synchronous reactance of 1.4 2 and an armature
resistance of 0.15 2. At 50 Hz, its friction and windage losses are 25 kW, and its core
losses are 15 kW. The field circuit has a DC voltage of 230 V, and the maximum IF is
10 A. The resistance of the field circuit is adjustable over the range from 20 to 200 £2.
The Open Circuit Characteristic (OCC) of this generator is shown in Figure Q1(c).
Calculate the internal generated voltage, EA of this machine at rated
conditions.
(i)
(ii)
(iii)
Determine the required field current to make Vr equal to 2400 V when the
generator is running at rated conditions.
If this machine is operating at rated conditions, determine the input torque,
TAPP that must be applied to the shaft of this generator.
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