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4th Semester
EX-403
Unit 1 Notes

EX-403 Digital Electronics Logic Design Unit 1 Notes

Notes and important questions for unit 1: Number Systems and Codes.

Unit 1 · Short notes Number Systems and Codes Digital number systems, base conversion, binary, decimal, octal, hexadecimal, number system with radix r, Gray codes · Alphanumeric codes – ASCII code and BCD codes, concept of parity, complement r's & (r‑1)'s, subtraction with complements, signed binary numbers, error detecting & correcting codes · Basic theorems and properties of Boolean algebra: AND, OR, NOT operators, Boolean algebra laws, De Morgan’s theorem, Boolean expression & logic diagram · Negative logic, alternate logic‑gate representation (bubbled gates), canonical and standard forms (minterms & maxterms), sum‑of‑minterms and product‑of‑maxterms conversion · Truth tables and Karnaugh maps for 2‑, 3‑, 4‑, 5‑ and 6‑variable functions, solving digital problems using maps, don’t‑care conditions, tabular minimisation · Sum‑of‑products and product‑of‑sums reduction, exclusive‑OR & exclusive‑NOR circuits, parity generator & checker design

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