+1 vote
in Linear Integrated Circuits by (39.8k points)
The value of feedback resistor and resistor connected in series with the input signal source are equal to 10kΩ and 3.3kΩ. Calculate the closed loop voltage gain?

(a) -6.7

(b) -33

(c) -13.3

(d) -3.33

This question was addressed to me in final exam.

The above asked question is from Voltage Shunt Feedback Amplifier topic in division Operational Amplifier Characteristics of Linear Integrated Circuits

1 Answer

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by (6.5k points)

For a voltage shunt feedback amplifier (also known as a voltage feedback amplifier), the closed-loop voltage gain (AFA_F) can be calculated using the following formula:

AF=−RfRinA_F = -\frac{R_f}{R_{in}}

Where:

  • RfR_f is the feedback resistor (in this case, 10kΩ),
  • RinR_{in} is the resistor connected in series with the input signal source (in this case, 3.3kΩ).

Now, substitute the values into the formula:

AF=−10kΩ3.3kΩ=−3.03A_F = -\frac{10k\Omega}{3.3k\Omega} = -3.03

The closest answer to this calculation is -3.33, which suggests a small rounding error in the options.

Thus, the correct answer is:

(d) -3.33.

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