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Component 1: Signal Conversion
Quick questions on Digital-to-analogue conversion: summing and R-2R DACs - 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 the output equation?Show answer
The output is proportional to the digital value, so stepping the code from 0 up to its maximum steps the output up in equal voltage increments. The most significant bit contributes the largest step.
What is q1?Show answer
State the main advantage of the R-2R ladder DAC over the weighted-resistor DAC. [1 mark]
What is q2?Show answer
Explain why a low-pass filter is placed on the output of a DAC. [2 marks]
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