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Circuit design brings together all the topics in this course: logic gates, Boolean algebra, truth tables, K-maps, adders, and flip-flops. In OCR H446, you need to be able to design circuits from requirements, combine gates effectively, minimise before implementing, and understand real-world applications of digital circuit design.
| Step | Action | Tools used |
|---|---|---|
| 1 | Understand the requirements | Problem description, input/output specification |
| 2 | Construct the truth table | List all input combinations and desired outputs |
| 3 | Derive the Boolean expression | Sum of Products (minterms) from the truth table |
| 4 | Simplify the expression | Boolean algebra laws, K-maps |
| 5 | Draw the circuit | Logic gate symbols |
| 6 | Verify the circuit | Trace through with test inputs |
Requirement: Design a circuit with three inputs (A, B, C) that outputs 1 when at least two of the three inputs are 1.
Step 1: Truth table:
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