non-inverting amplifier configuration (A-level only) Flashcards – AQA A-level Physics (7408)

How are the input voltage and the two resistors connected in a non-inverting amplifier?

The input voltage goes to the non-inverting input. A feedback resistor connects the output to the inverting input, and another resistor connects the inverting input to ground.

What is the ideal closed-loop voltage gain of a non-inverting amplifier with feedback resistance $R_{\mathrm{f}}$ and grounding resistance $R_l$?

$\frac{V_{\mathrm{out}}}{V_{\mathrm{in}}}=1+\frac{R_{\mathrm{f}}}{R_l}$

Is the output of a non-inverting amplifier inverted relative to its input?

No. Its gain is positive, so the output is not inverted.

What is the minimum ideal closed-loop gain of a non-inverting amplifier with positive resistor values?

The gain is at least one.