The ideal operational amplifier (AQA A-Level Physics): Quizzes

To increase analogue signal strength

Minus sign $(-)$

$A = \frac{V_{out}}{V_{in}}$

No feedback and very high gain

Output fed back to input

$V_{out} = A_{OL}(V_{+} - V_{-})$

No current drawn from input sources

Output stays at supply voltage limit

Positive supply voltage

Resistance increases, $V_{out}$ rises