Quick questions on Analogue-to-digital conversion: sampling, quantisation and resolution - WJEC A-Level Electronics

3short 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 quantisation error?

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Because each sample is rounded to the nearest level, there is always a small quantisation error, at most half a step. Increasing the number of bits shrinks the step and so shrinks this error, which is why high-quality audio uses 16 or 24 bits.

What is q1?

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An ADC samples at

40\,\text{kHz}

. What is the highest signal frequency it can capture without aliasing? [1 mark]

What is q2?

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A 4-bit ADC has a full-scale of

8.0\,\text{V}

. Find the number of levels and the resolution. [2 marks]

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