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Find the ft required for internally compensated op amps to be used in the implementation of the closed loop amplifiers with dc gain of -2 V/V and 3db bandwidth of 10 MHz?
- a)7.5 MHz
- b)15 MHz
- c)22.5 MHz
- d)30 MHz
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Find the ftrequired for internally compensated op amps to be used in t...
-R2 ⁄ R1 = -2V⁄V
f3db = 10 MHZ ft = 10 MHZ(2 + 1) = 30 MHZ.
f3db = 10 MHZ ft = 10 MHZ(2 + 1) = 30 MHZ.
Most Upvoted Answer
Find the ftrequired for internally compensated op amps to be used in t...
Understanding the Requirements for Closed Loop Amplifiers
To design a closed-loop amplifier with a specific DC gain and bandwidth, we need to consider the gain-bandwidth product (GBP) of the operational amplifier (op-amp).
Key Concepts
- DC Gain: Given as -2 V/V, which indicates an inverting amplifier configuration.
- 3dB Bandwidth: Required bandwidth is 10 MHz.
Calculating the Required Gain-Bandwidth Product
The gain-bandwidth product (GBP) is a constant for a given op-amp. It can be expressed as:
GBP = Gain × Bandwidth
In this case, the gain is -2 (absolute value is considered):
- Gain (|A|) = 2 V/V
- Bandwidth (BW) = 10 MHz
Thus, the required GBP will be:
GBP = 2 V/V × 10 MHz = 20 MHz
Choosing the Appropriate Op-Amp
For an op-amp to successfully implement the closed-loop amplifier, its GBP must be equal to or greater than the calculated value of 20 MHz.
The required frequency for internally compensated op-amps typically needs to be higher than the desired bandwidth to account for the phase margin and stability.
Final Calculation for Required Frequency
To ensure stability and accommodate the closed-loop gain, we can estimate a safe operating frequency:
- A common rule of thumb is to use a frequency that is 1.5 to 2 times the GBP.
Therefore,
Required Frequency = 2 × 10 MHz = 20 MHz
Considering additional safety margins, a frequency of about 30 MHz is recommended for stability.
Conclusion
Based on these calculations, the correct option for the required frequency is:
Option 'D': 30 MHz
To design a closed-loop amplifier with a specific DC gain and bandwidth, we need to consider the gain-bandwidth product (GBP) of the operational amplifier (op-amp).
Key Concepts
- DC Gain: Given as -2 V/V, which indicates an inverting amplifier configuration.
- 3dB Bandwidth: Required bandwidth is 10 MHz.
Calculating the Required Gain-Bandwidth Product
The gain-bandwidth product (GBP) is a constant for a given op-amp. It can be expressed as:
GBP = Gain × Bandwidth
In this case, the gain is -2 (absolute value is considered):
- Gain (|A|) = 2 V/V
- Bandwidth (BW) = 10 MHz
Thus, the required GBP will be:
GBP = 2 V/V × 10 MHz = 20 MHz
Choosing the Appropriate Op-Amp
For an op-amp to successfully implement the closed-loop amplifier, its GBP must be equal to or greater than the calculated value of 20 MHz.
The required frequency for internally compensated op-amps typically needs to be higher than the desired bandwidth to account for the phase margin and stability.
Final Calculation for Required Frequency
To ensure stability and accommodate the closed-loop gain, we can estimate a safe operating frequency:
- A common rule of thumb is to use a frequency that is 1.5 to 2 times the GBP.
Therefore,
Required Frequency = 2 × 10 MHz = 20 MHz
Considering additional safety margins, a frequency of about 30 MHz is recommended for stability.
Conclusion
Based on these calculations, the correct option for the required frequency is:
Option 'D': 30 MHz
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Find the ftrequired for internally compensated op amps to be used in the implementation of the closed loop amplifiers with dc gain of -2 V/V and 3db bandwidth of 10 MHz?a)7.5 MHzb)15 MHzc)22.5 MHzd)30 MHzCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Find the ftrequired for internally compensated op amps to be used in the implementation of the closed loop amplifiers with dc gain of -2 V/V and 3db bandwidth of 10 MHz?a)7.5 MHzb)15 MHzc)22.5 MHzd)30 MHzCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Find the ftrequired for internally compensated op amps to be used in the implementation of the closed loop amplifiers with dc gain of -2 V/V and 3db bandwidth of 10 MHz?a)7.5 MHzb)15 MHzc)22.5 MHzd)30 MHzCorrect answer is option 'D'. Can you explain this answer?.
Find the ftrequired for internally compensated op amps to be used in the implementation of the closed loop amplifiers with dc gain of -2 V/V and 3db bandwidth of 10 MHz?a)7.5 MHzb)15 MHzc)22.5 MHzd)30 MHzCorrect answer is option 'D'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Find the ftrequired for internally compensated op amps to be used in the implementation of the closed loop amplifiers with dc gain of -2 V/V and 3db bandwidth of 10 MHz?a)7.5 MHzb)15 MHzc)22.5 MHzd)30 MHzCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Find the ftrequired for internally compensated op amps to be used in the implementation of the closed loop amplifiers with dc gain of -2 V/V and 3db bandwidth of 10 MHz?a)7.5 MHzb)15 MHzc)22.5 MHzd)30 MHzCorrect answer is option 'D'. Can you explain this answer?.
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