Exercise: Operational Amplifiers

Questions for: Operational Amplifiers

As the frequency increases, the input impedance of an op-amp ________ and the output impedance ________.
A:
increases, increases
B:
increases, decreases
C:
decreases, decreases
D:
decreases, increases
Answer: C
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Ideally, the value of the CMRR is ________. Practically, the ________ the value of CMRR, the better the circuit operation.
A:
zero, smaller
B:
infinite, larger
C:
zero, larger
D:
infinite, smaller
Answer: B
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In a differential amplifier circuit, if an input signal is applied to either input with the other input connected to ground, the operation is referred to as ________.
A:
double-ended
B:
single-ended
C:
common-mode
D:
All of the above
Answer: B
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If the same input is applied to both inputs, the operation is called ________.
A:
double-ended
B:
single-ended
C:
common-mode
D:
All of the above
Answer: C
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If two opposite-polarity input signals are applied, the operation is referred to as ________.
A:
double-ended
B:
single-ended
C:
common-mode
D:
All of the above
Answer: A
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