Real operational amplifiers (AQA A-Level Physics): Flashcards

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Real operational amplifiers
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Open-loop gain AOLA_\text{OL} of real op-amp

Around 10610^6

Input resistance RinR_\text{in} of real op-amp

Up to 1012Ω10^{12} \, \Omega

Output resistance RoutR_\text{out} of real op-amp

Around 100Ω100 \, \Omega

Open-loop bandwidth of real op-amp

Around 1515 Hz

Closed-loop bandwidth of real op-amp

Up to 2.52.5 MHz

Current scale drawn by real op-amp input

Nanoamperes

Offset voltage in real op-amp

Small non-zero output when both inputs are grounded

Purpose of offset nulling

To calibrate device and counter offset voltage

Gain-bandwidth product relationship

gain×bandwidth=constant\text{gain} \times \text{bandwidth} = \text{constant}

Effect of increasing gain on bandwidth

Reduces available bandwidth

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