The diff-amp in Figure 11.3 of the text has parameters V + = + 5 V V − = − 5 V , R C = 8 k Ω , and I Q = 0.5 mA . The transistor parameters are β = 120 , V B E ( on ) = 0.7 V , and V A = ∞ . (a) Using Figure 11.3 ( a ) , determine the maximum common-mode input voltage v c m that can be applied such that the transistors Q 1 and Q 2 remain biased in the active region. (b) Using Figure 11.3 ( b ) , determine the change in v C 2 from its de value if v d = 18 mV . ( c ) Repeat part (b) if v d = 10 mV .
The diff-amp in Figure 11.3 of the text has parameters V + = + 5 V V − = − 5 V , R C = 8 k Ω , and I Q = 0.5 mA . The transistor parameters are β = 120 , V B E ( on ) = 0.7 V , and V A = ∞ . (a) Using Figure 11.3 ( a ) , determine the maximum common-mode input voltage v c m that can be applied such that the transistors Q 1 and Q 2 remain biased in the active region. (b) Using Figure 11.3 ( b ) , determine the change in v C 2 from its de value if v d = 18 mV . ( c ) Repeat part (b) if v d = 10 mV .
Solution Summary: The circuit diagram shows the value of the maximum common mode input voltage that can be applied to the transistors.
The diff-amp in Figure 11.3 of the text has parameters
V
+
=
+
5
V
V
−
=
−
5
V
,
R
C
=
8
k
Ω
,
and
I
Q
=
0.5
mA
.
The transistor parameters are
β
=
120
,
V
B
E
(
on
)
=
0.7
V
,
and
V
A
=
∞
.
(a) Using Figure
11.3
(
a
)
,
determine the maximum common-mode input voltage
v
c
m
that can be applied such that the transistors
Q
1
and
Q
2
remain biased in the active region. (b) Using Figure
11.3
(
b
)
,
determine the change in
v
C
2
from its de value if
v
d
=
18
mV
.
(
c
)
Repeat part (b) if
v
d
=
10
mV
.
Consider the common-source amplifier shown in Figure P11.50. The NMOS transistor has KP=50 μA/V2, L=5 μm, W=500 μm, Vto=1 V and rd=∞.a. Determine the values of IDQ, VDSQ and gm. b. Compute the voltage gain, input resistance, and output resistance, assuming that the coupling capacitors are short circuits for the ac signal.
Repeat Problem P11.50 for an NMOS transistor having KP=50 μA/V2, W=600 μm, L=20 μm, Vto=2 V and rd=∞. Compare the gain with that attained in Problem P11.50.
Consider the circuit of Figure 2.1 using Vcc = 12 volts, Rb = 220 kΩ and Rc = 1 kΩ. Compute the theoretical base, emitter and collector voltages.
Kindly show process in solution
2. A load of 8Ω is supplied by a single-switch Direct Current (DC) chopper with an inputvoltage of 40V. The switching frequency is 800Hz, the duty ratio is 0.4, and thetransmission voltage drop of the transistor is 2.4V
a. Draw the chopper circuit presented in the question
b. Find the switching period with the duty time of BJT
c. Draw the load voltage, load current, BJT current, BJT voltage along two periods
d. Find the output voltage. Is the achieved load voltage the average value or the effectivevalue e. Find the output power f. Find the average value and effective value of BJT current g. Find the power loss of BJT h. Find the DC source current i. Find the circuit efficiency
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