Operational Amplifier Fundamentals – Exercise – 3

106. What is the difference voltage if the inputs are an ideal in-phase signal?

(a) The differential gain times twice the input signal.
(b) The differential gain times the input signal.
(c) The common-mode gain times twice the input signal.
(d) The common-mode gain times the input signal.

Answer
Answer : (d)
Explanation
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107. 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
Answer : (a)
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108. What is the cutoff frequency of an op-amp if the unity-gain frequency is 1.5 MHz and the open-loop gain is 100,000?

(a) 5 Hz
(b) 10 Hz
(c) 15 Hz
(d) 20 Hz

Answer
Answer : (c)
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109. Calculate the output impedance of an inverting op-amp using the 741 op-amp (ro = 75 Ω, AOL = 200 V/mV) if R1 = 100 Ω and Rf = 1 kΩ.

(a) 0.011
(b) 0.00375
(c) 0.0375
(d) 0.375

Answer
Answer : (b)
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110. What is the open-loop gain of an op-amp at the gain-bandwidth product of the op-amp?

(a) 200,000
(b) 50,000
(c) 200
(d) 1

Answer
Answer : (d)
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