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An inverting amplifier with nominal gain of −20 V/V employs an op amp having a dc gain of 104 and a unity-gain frequency of 106 Hz. What is the 3-dB frequency f3dB of the closed-loop amplifier?
  • a)
    2π 23.8 kHz
  • b)
    2π 47.6 kHz
  • c)
    2π 71.4 kHz
  • d)
    2π 95.2 kHz
Correct answer is option 'B'. Can you explain this answer?
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An inverting amplifier is a type of operational amplifier (op-amp) configuration that produces an output signal that is the inverse (or opposite) of the input signal. The nominal gain of an inverting amplifier refers to the amplification factor by which the input signal is multiplied.

The gain of an inverting amplifier is determined by the ratio of two resistors, Rf and Rin, connected to the op-amp. The formula for calculating the gain is:

Gain = - (Rf / Rin)

The negative sign indicates that the output signal is inverted compared to the input signal. By selecting appropriate resistor values, the magnitude of the gain can be adjusted to the desired level.

For example, if Rf = 10kΩ and Rin = 1kΩ, the gain of the inverting amplifier would be:

Gain = - (10kΩ / 1kΩ) = -10

This means that the output signal will be 10 times smaller in magnitude than the input signal, but with the opposite polarity.
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An inverting amplifier with nominal gain of −20 V/V employs an op amp having a dc gain of 104 and a unity-gain frequency of 106 Hz. What is the 3-dB frequency f3dB of the closed-loop amplifier?a)2π 23.8 kHzb)2π 47.6 kHzc)2π 71.4 kHzd)2π 95.2 kHzCorrect answer is option 'B'. 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 An inverting amplifier with nominal gain of −20 V/V employs an op amp having a dc gain of 104 and a unity-gain frequency of 106 Hz. What is the 3-dB frequency f3dB of the closed-loop amplifier?a)2π 23.8 kHzb)2π 47.6 kHzc)2π 71.4 kHzd)2π 95.2 kHzCorrect answer is option 'B'. 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 An inverting amplifier with nominal gain of −20 V/V employs an op amp having a dc gain of 104 and a unity-gain frequency of 106 Hz. What is the 3-dB frequency f3dB of the closed-loop amplifier?a)2π 23.8 kHzb)2π 47.6 kHzc)2π 71.4 kHzd)2π 95.2 kHzCorrect answer is option 'B'. Can you explain this answer?.
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