In a closed-loop configuration of an operational amplifier (Op-Amp), what is the main purpose of adding feedback resistors?

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To stabilize the gain of the Op-Amp

To increase the input impedance

To reduce the output impedance

To eliminate noise completely

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Answer

In a closed‑loop op‑amp circuit, the feedback resistors set the amount of the output that is fed back to the input, which directly determines the overall gain of the amplifier. By choosing the resistor values, you can make the gain stable and independent of the op‑amp’s open‑loop characteristics, which are usually very high and vary with temperature and supply voltage. The feedback network also limits the bandwidth and improves the linearity and stability of the circuit. For example, using a 10 kΩ resistor from the output to the inverting input and a 1 kΩ resistor from the inverting input to ground gives a fixed gain of 10, making the circuit behave predictably regardless of the op‑amp’s internal variations.

Detailed Explanation

Feedback resistors set how much of the output voltage is sent back to the input. Other options are incorrect because Some think feedback raises input impedance, but it mainly controls gain; Feedback does not lower the amplifier’s output impedance.

Key Concepts

Closed-loop configuration

Topic

Op-Amp Gain and Practical Considerations

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easy level question

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Question 1

In an operational amplifier (op-amp) circuit, which configuration allows for better accuracy and stability in output voltage under real-world conditions, by utilizing negative feedback? Is it the closed-loop configuration or the open-loop configuration?

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Question 2