The Operational Amplifier - Open-Loop Frequency and Phase responses
9 important questions on The Operational Amplifier - Open-Loop Frequency and Phase responses
The midrange open-loop gain of a certain op-amp is 120 dB. Negative feedback reduces this gain by 50 dB. What is the closed-loop gain?
The upper critical frequency of an op-amp’s open-loop response is 200 Hz. If the midrange gain is 175,000, what is the ideal gain at 200 Hz? What is the actual gain? What is the op amp’s open-loop bandwidth?
An RC lag circuit has a critical frequency of 5 kHz. If the resistance value is 1.0 kV, what is XC when f=3 kHz?
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Determine the attenuation of an RC lag circuit with fc=12 kHz for each of the following frequencies.
(a) 1 kHz
(b) 5 kHz
(c) 12 kHz
(d) 20 kHz
(e) 100 kHz
The midrange open-loop gain of a certain op-amp is 80,000. If the open-loop critical frequency is 1 kHz, what is the open-loop gain at each of the following frequencies?
(a) 100 Hz
(b) 1 kHz
(c) 10 kHz
(d) 1 MHz
Determine the phase shift through each circuit in Figure 12–72 at a frequency of 2 kHz![]()
An RC lag circuit has a critical frequency of 8.5 kHz. Determine the phase shift for each frequency and plot a graph of its phase angle versus frequency.
(a) 100 Hz
(b) 400 Hz
(c) 850 Hz
(d) 8.5 kHz
(e) 25 kHz
(f) 85 kHz
A certain op-amp has three internal amplifier stages with midrange gains of 30 dB, 40 dB, and 20 dB. Each stage also has a critical frequency associated with it as follows: fc1=600 Hz, fc2=50 kHz, and fc3=200 kHz.
(a) What is the midrange open-loop gain of the op-amp, expressed in dB?
(b) What is the total phase shift through the amplifier, including inversion, when the signal frequency is 10 kHz?
What is the gain roll-off rate in Problem 33 between the following frequencies? (a) 0 Hz and 600 Hz
(b) 600 Hz and 50 kHz
(c) 50 kHz and 200 kHz
(d) 200 kHz and 1 MHz
(b) –20 dB/decade
(c) –40 dB/decade
(d) –60 dB/decade
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