An inverting amplifier uses

An inverting amplifier uses

• A. Positive feedback
• B. Negative feedback
• C. No feedback
• D. Feedforward

Answer: (B)

Negative feedback is what makes an inverting amplifier produce a stable, linear gain. In this setup, part of the output is fed back to the inverting input through a feedback resistor while the input signal is applied to that same node via another resistor. The non-inverting input is tied to ground, so the op-amp works to drive the difference between its inputs toward zero. This creates a virtual ground at the inverting input and establishes a defined closed-loop gain of -Rf/Rin, with the output inverted relative to the input. If positive feedback were used, the loop would push the output toward saturation rather than producing a controlled gain. Without any feedback, the open-loop gain would be enormous and the output would saturate almost instantly. Feedforward isn’t the mechanism here for setting the gain or inversion.

Negative feedback is what makes an inverting amplifier produce a stable, linear gain. In this setup, part of the output is fed back to the inverting input through a feedback resistor while the input signal is applied to that same node via another resistor. The non-inverting input is tied to ground, so the op-amp works to drive the difference between its inputs toward zero. This creates a virtual ground at the inverting input and establishes a defined closed-loop gain of -Rf/Rin, with the output inverted relative to the input. If positive feedback were used, the loop would push the output toward saturation rather than producing a controlled gain. Without any feedback, the open-loop gain would be enormous and the output would saturate almost instantly. Feedforward isn’t the mechanism here for setting the gain or inversion.