A-LevelPhysicsElectricity9702/41 · Oct/Nov 2018 · Q78 Marks
An ideal operational amplifier (op-amp) has infinite bandwidth and infinite slew rate.
- (a)(i)State what is meant by infinite bandwidth,[2]
- (a)(ii)State what is meant by infinite slew rate.[2]
- (b)On [Figure 7.1], draw lines to show the connections between the components to complete the circuit.[2]
- (c)(i)State the output voltage VOUT for an input voltage VIN of -0.36 V, VOUT = ........................................................... V[1]
- (c)(ii)State the output voltage VOUT for an input voltage VIN of 0.56 V. VOUT = ........................................................... V[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2018). The mark or mark type is shown in brackets.
- [M1] gain is constant
- [A1] for all frequencies
- [B1] no time delay between input (voltage) and output (voltage)
- [B1] clear reference to change(s) in input and/or output (voltages)
- [B1] diagram: VIN connected to V⁺ only
- [B1] midpoint between resistors R₁ and R₂ connected to V⁻ only
- [A1] -3.6V
- [A1] (+)5.0V
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