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WalesElectronicsQuick questions
Component 1: Operational Amplifiers
Quick questions on Inverting and non-inverting op-amp amplifiers and the voltage follower - WJEC A-Level Electronics
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is negative feedback?Show answer
Feedback trades gain for stability, accuracy and bandwidth: the circuit no longer depends on the exact (and variable) open-loop gain of the chip.
What is the non-inverting amplifier?Show answer
Here the signal goes to the non-inverting input, so the output is in phase. The gain is always at least one, and the configuration has a high input resistance, which is useful when the source is weak.
What is q1?Show answer
A non-inverting amplifier has and . Find its voltage gain. [2 marks]
What is q2?Show answer
Explain why negative feedback makes the gain of an op-amp amplifier independent of the exact open-loop gain. [2 marks]
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