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The midrange open-loop gain of an Op-Amp :
- a)extends from the lower critical frequency to the upper critical frequency
- b)extends from 0Hz to the upper critical frequency
- c)rolls off at 20 dB/decade beginning at 0Hz
- d)both (b) and (c)
Correct answer is option 'B'. Can you explain this answer?
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The midrange open-loop gain of an Op-Amp :a)extends from the lower cri...
It extends from 0Hz to the upper critical frequency.
The correct answer is: extends from 0Hz to the upper critical frequency
The correct answer is: extends from 0Hz to the upper critical frequency
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The midrange open-loop gain of an Op-Amp :a)extends from the lower cri...
Midrange Open-loop Gain of an Op-Amp
The midrange open-loop gain of an operational amplifier (Op-Amp) refers to the range of frequencies over which the amplifier operates with a constant gain. It is important to understand the characteristics of the midrange open-loop gain as it directly affects the performance and behavior of the Op-Amp in various applications.
Option (b): The midrange open-loop gain extends from 0Hz to the upper critical frequency.
Explanation:
1. Open-Loop Gain
The open-loop gain of an Op-Amp is the gain of the amplifier without any external feedback. It is the ratio of the output voltage to the input voltage when no feedback is applied. The open-loop gain of an ideal Op-Amp is typically very high (in the order of 10^5 to 10^6) and remains constant over a certain frequency range.
2. Frequency Response
The frequency response of an Op-Amp describes how the gain of the amplifier varies with frequency. It is typically represented by a plot of gain versus frequency. The frequency response of an Op-Amp can be divided into three regions:
- Low-frequency region: In this region, the gain remains relatively constant and is equal to the midrange open-loop gain.
- Mid-frequency region: This is the region over which the gain starts to decrease and deviate from the midrange open-loop gain.
- High-frequency region: In this region, the gain decreases rapidly, and the amplifier behaves like a low-pass filter.
3. Midrange Open-Loop Gain
The midrange open-loop gain is the range of frequencies over which the amplifier operates with a constant gain. It extends from 0Hz to the upper critical frequency. This means that within this frequency range, the gain of the amplifier remains constant and is equal to the midrange open-loop gain. It forms the flat portion of the frequency response curve.
4. Upper Critical Frequency
The upper critical frequency is the frequency at which the gain of the amplifier starts to decrease from the midrange open-loop gain. Beyond this frequency, the gain rolls off at a rate of 20 dB/decade (6 dB/octave).
Conclusion:
Option (b) is the correct answer because the midrange open-loop gain of an Op-Amp extends from 0Hz to the upper critical frequency. It represents the frequency range over which the amplifier operates with a constant gain before it starts to decrease. Option (c) is incorrect because the roll-off at 20 dB/decade occurs beyond the upper critical frequency, not from 0Hz.
The midrange open-loop gain of an operational amplifier (Op-Amp) refers to the range of frequencies over which the amplifier operates with a constant gain. It is important to understand the characteristics of the midrange open-loop gain as it directly affects the performance and behavior of the Op-Amp in various applications.
Option (b): The midrange open-loop gain extends from 0Hz to the upper critical frequency.
Explanation:
1. Open-Loop Gain
The open-loop gain of an Op-Amp is the gain of the amplifier without any external feedback. It is the ratio of the output voltage to the input voltage when no feedback is applied. The open-loop gain of an ideal Op-Amp is typically very high (in the order of 10^5 to 10^6) and remains constant over a certain frequency range.
2. Frequency Response
The frequency response of an Op-Amp describes how the gain of the amplifier varies with frequency. It is typically represented by a plot of gain versus frequency. The frequency response of an Op-Amp can be divided into three regions:
- Low-frequency region: In this region, the gain remains relatively constant and is equal to the midrange open-loop gain.
- Mid-frequency region: This is the region over which the gain starts to decrease and deviate from the midrange open-loop gain.
- High-frequency region: In this region, the gain decreases rapidly, and the amplifier behaves like a low-pass filter.
3. Midrange Open-Loop Gain
The midrange open-loop gain is the range of frequencies over which the amplifier operates with a constant gain. It extends from 0Hz to the upper critical frequency. This means that within this frequency range, the gain of the amplifier remains constant and is equal to the midrange open-loop gain. It forms the flat portion of the frequency response curve.
4. Upper Critical Frequency
The upper critical frequency is the frequency at which the gain of the amplifier starts to decrease from the midrange open-loop gain. Beyond this frequency, the gain rolls off at a rate of 20 dB/decade (6 dB/octave).
Conclusion:
Option (b) is the correct answer because the midrange open-loop gain of an Op-Amp extends from 0Hz to the upper critical frequency. It represents the frequency range over which the amplifier operates with a constant gain before it starts to decrease. Option (c) is incorrect because the roll-off at 20 dB/decade occurs beyond the upper critical frequency, not from 0Hz.
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