Answer :
When it comes to Feedback Amplifiers, the feedback loop is an essential part of the amplifier's configuration. The feedback loop's gain is determined by the proportion of output that is returned to the input. The gain in a Feedback Amplifier is regulated by controlling the quantity of feedback applied to the amplifier.
Feedback helps to regulate the amplifiers' output by feeding a portion of the amplifier's output signal back to its input. This allows for the monitoring and adjustment of an amplifier's gain and impedance levels. Given voltage gain of voltage amplifier, Av = 2400 V/VInput resistance of voltage amplifier, R = 3700 Ω
The closed-loop input impedance of feedback amplifier, ZF = 23 kΩ
Let the closed-loop gain of the feedback amplifier be AThe general formula for calculating the closed-loop gain of a feedback amplifier is given as: A = A0 / (1 + A0 * β) Where A0 is the open-loop gain of the amplifier and β is the feedback factor.
A feedback amplifier's input resistance is given by the following equation: RI = R / (1 + A * β)
By using this equation and substituting the given values, the value of β can be determined: 23 kΩ = 3700 Ω / (1 + A * β)β = [(3700 Ω / 23 kΩ) - 1] / A
Substituting this value of β in the formula of A, we get:A = A0 / [1 + A0 * ([(3700 Ω / 23 kΩ) - 1] / A)]
Simplifying the above equation, we get:A = A0 / [1 + (A0 * 3700 / 23 k) - A0] = (A0 / A0 * 26.22) = 1 / 26.22 ≈ 0.038
Converting the above value to dB: 20 log (0.038) ≈ -32.5 dB
Therefore, the closed-loop gain to the nearest integer is 1. Thus, the closed-loop gain of the feedback amplifier is 1, based on the given parameters.
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