Exercise: Analog Electronics

Questions for: Analog Electronics

The input impedance of op-amp circuit of figure is
A:
120 k ohm
B:
110 k ohm
C:
infinity
D:
10 k ohm
Answer: D

Due to the presence of virtual ground at input, the resistance in the series path of input of inverting amplifier is input impedance.

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In figure, VEB = 0.6 V, β = 99. Then VC and IC are
A:
9.3 V and 1.98 mA respectively
B:
4.6 V and 1.98 mA respectively
C:
9.3 V and 0.02 mA respectively
D:
4.6 V and 0.02 mA respectively
Answer: A

VC = 20 - 1.98 x 10-3 x 5.4 x 103 9.3 V.

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In figure The minimum and maximum load currents are
A:
0 and 60 mA
B:
0 and 120 mA
C:
10 mA and 60 mA
D:
10 mA and 120 mA
Answer: B

When RL = ∞, IL = 0,

When RL = 100 Ω, or 120 mA.

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If an amplifier with gain of - 1000 and feedback factor β = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be
A:
10%
B:
5%
C:
0.2%
D:
0.01%
Answer: C

As we know, Gain with feedback

A = - 1000, β = -0.1 .

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Gain of the amplifier is 'A'. Then the I/P impedance and O/P impedance of the closed loop amplifier shown below would be
A:
B:
C:
D:
Answer: B

By using Miller theorem circuit can be redrawn as

.

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