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Digital Logic Structures: Chapter 3 COMP 2610 Dr. James Money COMP 2610 1
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
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
The NOT Gate (Inverter) InOut 0 V2.9 V 0 V InOut 01 10 2.9 Volts 0 Volts
The NOT Gate (Inverter)
OR and NOR Gates ABC 0 V 2.9 V 0 V2.9 V0 V 2.9 V0 V 2.9 V 0 V
OR and NOR Gates ABC = A NOR B 001 010 100 110
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
OR and NOR Gates OR Gate
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Logic Gate Objects This document contains various images created by Andrew C. M. Rodger, 4 October Tools used:LibreOffice Impress 3 Microsoft Powerpoint.
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