Two feedback configurations are shown in Figures P 12.7 ( a ) and P 12.7 ( b ) .The closed-loop gain in each case is A v f = v o / v i = 50. (a) Determine β 1 and β 2 for the two circuits. (b) The gain A 2 decreases by 10 percent in both circuits. Using the results of part (a), determine the percent change in the closed-loop gain for each circuit. (c) What conclusion can be made as to the "better" feedback configuration? Figure P12.7
Two feedback configurations are shown in Figures P 12.7 ( a ) and P 12.7 ( b ) .The closed-loop gain in each case is A v f = v o / v i = 50. (a) Determine β 1 and β 2 for the two circuits. (b) The gain A 2 decreases by 10 percent in both circuits. Using the results of part (a), determine the percent change in the closed-loop gain for each circuit. (c) What conclusion can be made as to the "better" feedback configuration? Figure P12.7
Solution Summary: The author calculates the value of feedback transfer function ß 1 and 2 based on the given circuits.
Two feedback configurations are shown in Figures
P
12.7
(
a
)
and
P
12.7
(
b
)
.The closed-loop gain in each case is
A
v
f
=
v
o
/
v
i
=
50.
(a) Determine
β
1
and
β
2
for the two circuits. (b) The gain
A
2
decreases by 10 percent in both circuits. Using the results of part (a), determine the percent change in the closed-loop gain for each circuit. (c) What conclusion can be made as to the "better" feedback configuration?
Find the expression for the open loop gain Rm (=Output voltage/Input current). Get the expression for Ro,cl (closed loop output resistance).
What is a typical value of open-loop, low-frequency gain of an op-arop circuit? How does this compare to the ideal value?
e.
f.
a.
An ideal feedback amplifier is given as block diagram. According to feedback topology do the
required calculations and fill the blanks. Show your calculation steps as well.
b.
C.
The type of feedback applied to this circuit is
Forward direction transfer function is
Feedback transfer function is
d.
Value of open loop gain of the amplifier is.
Value of feedback loop gain of the amplifier is..
1
Considering that V₁ = 100mV; V=99mV; V, = 5V. Show all the required calculations.
Value of closed loop gain of the amplifier is
... amplification.
..amplification.
..(Calculate and write with unit)
..(Calculate and write with unit)
..(Calculate and write with unit)
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