Design a feedback current amplifier to provide a current gain of 15. The nominal current source resistance is R S = 500 Ω , and the nominal load is R L = 200 Ω . An op-amp with parameters R i = 5 k Ω , R o = 50 Ω , and a low-frequency open-loop voltage gain of A v = 5 × 10 3 is available. Correlate the design with a PSpice analysis to determine the current gain, input resistance, and output resistance.
Design a feedback current amplifier to provide a current gain of 15. The nominal current source resistance is R S = 500 Ω , and the nominal load is R L = 200 Ω . An op-amp with parameters R i = 5 k Ω , R o = 50 Ω , and a low-frequency open-loop voltage gain of A v = 5 × 10 3 is available. Correlate the design with a PSpice analysis to determine the current gain, input resistance, and output resistance.
Solution Summary: The author explains the design of a feedback amplifier. The current gain, input resistance, and output resistance are determined by correlating the circuit with the PSpice analysis.
Design a feedback current amplifier to provide a current gain of 15. The nominal current source resistance is
R
S
=
500
Ω
,
and the nominal load is
R
L
=
200
Ω
.
An op-amp with parameters
R
i
=
5
k
Ω
,
R
o
=
50
Ω
,
and a low-frequency open-loop voltage gain of
A
v
=
5
×
10
3
is available. Correlate the design with a PSpice analysis to determine the current gain, input resistance, and output resistance.
An op-amp with open-loop parameters OFAOL = 2 x 105 and fPD = 5 Hz is connected in a
noninverting amplifier configuration with a low- frequency closed-loop gain of ACLO = 30. An
input voltage signal of v = 100sin(27ft) P V is applied. (a) What is the closed-loop bandwidth?
4. Op-Amp has
(a)Single
(b) Similar
(c)Multiple
(d)Differential
5. Write the formula for closed-loop voltage gain of inverting amplifier with feedback using of
voltage gain and gain of the feedback circuit.
(a)AF= A/(1+AB)
(b)AF= -A/(1+AB)
(c)AF=-B/(1+AB) (d)None of the m
6. Voltage shunt feedback amplifiers are also called as
(a)Non-inverting amplifier with feedback
(c)Inverting amplifier with feedback
(b)Non-inverting amplifier without
(d)Inverting amplifier without feed
outputs.
0.3/(5) Marks
Derive the closed loop gain of the op-amp
circuit illustrated in figure below. Then find the
gain when R₁ 10 ΚΩ, R2 5kn, and R3:
15ΚΩ.
=
=
=
Vs
R₁
R2
R3
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