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Digital Logic Structures: Chapter 3 COMP 2610 Dr. James Money COMP 2610 1

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Logic Gates One level up from the transistor is a logic gate We use individual MOS transistors to construct our basic logic structures We will consider AND, OR, and NOT gates

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The NOT Gate (Inverter) To construct a NOT gate, we need – One n-type transistor – One p-type transistor These are connected together to obtain the NOT gate This is sometimes called an inverter

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The NOT Gate (Inverter) InOut 0 V2.9 V 0 V InOut 01 10 2.9 Volts 0 Volts

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The NOT Gate (Inverter)

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OR and NOR Gates ABC 0 V 2.9 V 0 V2.9 V0 V 2.9 V0 V 2.9 V 0 V

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OR and NOR Gates ABC = A NOR B 001 010 100 110

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OR and NOR Gates How to we obtain the OR gate now? We chain the NOT gate to the end of the NOR gate NOT (NOR) = OR We do this b/c it is cheaper to produce NOT type gates versus regular ones

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OR and NOR Gates OR Gate

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