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An amplifier has a Open Loop voltage gain of –500. This gain is reduced to –100 when negative feedback is applied. The reverse transmission factor,β of this system is:-
  • a)
    – 0.025
  • b)
    – 0.008
  • c)
    0.1
  • d)
    – 0.2
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
An amplifier has a Open Loop voltage gain of –500. This gain is ...
Concept:
The gain of a feedback system is given by:
A = Open Loop gain
Af = Closed Loop Gain
β = Feedback/Transmission factor
Calculation:
Given Af = -100 and A = -500
1 + Aβ = 5
Aβ = 4
β = 4 / -500 = -0.008
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Community Answer
An amplifier has a Open Loop voltage gain of –500. This gain is ...
An amplifier has an open loop voltage gain of "A." The open loop voltage gain, also known as the gain without any feedback applied, is a measure of how much the amplifier amplifies the input voltage. It is typically expressed as a ratio or in decibels.

The open loop voltage gain can be calculated by dividing the output voltage by the input voltage:

Open Loop Voltage Gain (A) = Output Voltage / Input Voltage

For example, if an amplifier has an output voltage of 10V and an input voltage of 1V, the open loop voltage gain would be 10.

It is important to note that the open loop voltage gain is not a fixed value and can vary depending on the frequency of the input signal. Amplifiers often have a frequency response curve that shows how the gain changes with frequency.

Additionally, the open loop voltage gain is usually much higher than the closed loop voltage gain when feedback is applied. Feedback is commonly used to stabilize the amplifier's performance and reduce distortion.
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