Exercise: Operational Amplifiers

Questions for: Operational Amplifiers

If Rf = R1, the voltage gain is ________.

A:
1
B:
–1
C:
10
D:
very small
Answer: B
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Calculate the output voltage if R1 = R2 = R3 = 100 , Rf = 1 k, and V1 = V2 = V3 = 50 mV.

A:
–1.5 V
B:
1.5 V
C:
0.5 V
D:
–0.5 V
Answer: A
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Refer to the given figure. This amplifier is known as

A:
an inverting amplifier.
B:
a non-inverting amplifier.
C:
a voltage-follower.
D:
a common-source amplifier.
Answer: C
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What is the slew rate of an op-amp if the output voltages change from 2 V to 3 V in 0.2 ms?
A:
5 V/ms
B:
3 V/ms
C:
2 V/ms
D:
1 V/ms
Answer: A
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Refer to the given figure. You need an amplifier with an input impedance of 12 k. You must not change the amplifier voltage gain. The new value of Ri would be ________ and the new value of Rf would be ________.

A:
10 k, 100 k
B:
13.3 k, 120 k
C:
12 k, 108 k
D:
12 k, 120 k
Answer: D
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