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Topic 4 Digital Circuit Design - Outline Outline Topic 4 g...

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Topic 4 Digital Circuit Design with gg Gates Akash Kumar utline Outline Circuit Design Considerations Design in Positive Logic Notation 2 ircuit Design Considerations Circuit Design Considerations Any Boolean expression can be implemented using only AND gates and inverters R gates and inverters OR gates and inverters NAND gates NOR gates. But the variety of gates available gives us flexibility in design. 3 ircuit Design Considerations Circuit Design Considerations Conceptually, it is easiest to design with AND, OR gates and inverters, but we need to be able to design with any pe of gate: type of gate: NAND and NOR gates are simpler in their internal onstruction and are faster than AND nd R gates. construction and are faster than AND and OR gates. Internally, an AND gate is NAND followed by an inverter ince IC chips contain multiple gates, some unused Since IC chips contain multiple gates, some unused gates may be available. These should be considered before adding more IC’s. Logic diagrams should use gate representations which lead to clear circuit diagrams. 4
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ositive Logic Circuit Design Positive Logic Circuit Design Starting with TT/K-maps, design circuits using common gates. xample: WXY Z 000 0 Example: Design a digital circuit to plement Z defined in the 001 0 010 1 implement Z defined in the following truth table.
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