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If a certain Op-Amp has a closed loop gain of 20 and an upper critical frequency of 10 MHz, the gain bandwidth product is :
- a)50 MHz
- b)20 MHz
- c)10 MHz
- d)unity gain frequency
Correct answer is option 'B,D'. Can you explain this answer?
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Verified Answer
If a certain Op-Amp has a closed loop gain of 20 and an upper critical...
GBW= 20 x 10 = 200MHz and gain bandwidth product is also defined as the frequency with unity gain.
The correct answers are: 20 MHz, unity gain frequency
The correct answers are: 20 MHz, unity gain frequency
Most Upvoted Answer
If a certain Op-Amp has a closed loop gain of 20 and an upper critical...
GBW= 20 x 10 = 200MHz and gain bandwidth product is also defined as the frequency with unity gain.
The correct answers are: 20 MHz, unity gain frequency
The correct answers are: 20 MHz, unity gain frequency
Community Answer
If a certain Op-Amp has a closed loop gain of 20 and an upper critical...
Op-Amp Closed Loop Gain
The closed loop gain of an operational amplifier (Op-Amp) is the ratio of the output voltage to the input voltage when the amplifier is in a feedback configuration. It is determined by the feedback resistors and is usually expressed in decibels (dB).
Upper Critical Frequency
The upper critical frequency, also known as the unity-gain frequency or the gain-bandwidth product, is the frequency at which the open-loop voltage gain of the Op-Amp drops to unity (1). Above this frequency, the gain decreases with increasing frequency.
Calculating Gain Bandwidth Product
To calculate the gain bandwidth product (GBW), we multiply the closed loop gain (A) with the upper critical frequency (f):
GBW = A * f
In this case, the closed loop gain (A) is given as 20 and the upper critical frequency (f) is given as 10 MHz. Plugging these values into the formula:
GBW = 20 * 10 MHz
Simplifying the expression:
GBW = 200 MHz
Thus, the correct answer is option 'B' - 200 MHz.
Unity Gain Frequency
The unity gain frequency is the frequency at which the open-loop voltage gain of the Op-Amp drops to unity (1). It is also equal to the upper critical frequency when the Op-Amp is in a closed loop configuration.
In this case, since the closed loop gain is 20 and the upper critical frequency is 10 MHz, the unity gain frequency would also be 10 MHz.
Thus, the correct answer is option 'D' - unity gain frequency.
Summary
- The closed loop gain is the ratio of the output voltage to the input voltage in a feedback configuration.
- The upper critical frequency, also known as the gain bandwidth product, is the frequency at which the open-loop voltage gain drops to unity.
- The gain bandwidth product is calculated by multiplying the closed loop gain with the upper critical frequency.
- In this case, the gain bandwidth product is 200 MHz (option 'B') and the unity gain frequency is 10 MHz (option 'D').
The closed loop gain of an operational amplifier (Op-Amp) is the ratio of the output voltage to the input voltage when the amplifier is in a feedback configuration. It is determined by the feedback resistors and is usually expressed in decibels (dB).
Upper Critical Frequency
The upper critical frequency, also known as the unity-gain frequency or the gain-bandwidth product, is the frequency at which the open-loop voltage gain of the Op-Amp drops to unity (1). Above this frequency, the gain decreases with increasing frequency.
Calculating Gain Bandwidth Product
To calculate the gain bandwidth product (GBW), we multiply the closed loop gain (A) with the upper critical frequency (f):
GBW = A * f
In this case, the closed loop gain (A) is given as 20 and the upper critical frequency (f) is given as 10 MHz. Plugging these values into the formula:
GBW = 20 * 10 MHz
Simplifying the expression:
GBW = 200 MHz
Thus, the correct answer is option 'B' - 200 MHz.
Unity Gain Frequency
The unity gain frequency is the frequency at which the open-loop voltage gain of the Op-Amp drops to unity (1). It is also equal to the upper critical frequency when the Op-Amp is in a closed loop configuration.
In this case, since the closed loop gain is 20 and the upper critical frequency is 10 MHz, the unity gain frequency would also be 10 MHz.
Thus, the correct answer is option 'D' - unity gain frequency.
Summary
- The closed loop gain is the ratio of the output voltage to the input voltage in a feedback configuration.
- The upper critical frequency, also known as the gain bandwidth product, is the frequency at which the open-loop voltage gain drops to unity.
- The gain bandwidth product is calculated by multiplying the closed loop gain with the upper critical frequency.
- In this case, the gain bandwidth product is 200 MHz (option 'B') and the unity gain frequency is 10 MHz (option 'D').
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If a certain Op-Amp has a closed loop gain of 20 and an upper critical frequency of 10 MHz, the gain bandwidth product is :a)50 MHzb)20 MHzc)10 MHzd)unity gain frequencyCorrect answer is option 'B,D'. Can you explain this answer?
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