Diode Logic - Diode Logic Gate Versions - and Logic Gate - Basic Idea

Basic Idea

AND logic gates are implemented by series connected normally open switches. So, diode AND logic gates should be implemented by series connected diode switches (like an NMOS AND gate that is implemented by series connected transistor switches). However, in contrast to transistors, diodes are two-terminal switching elements, in which the input and output are not separated but they are the same. As a result, series connected diode switches cannot be driven by grounded input voltage sources. To solve this problem, diode AND gates are constructed in the same manner as OR diode gates - by parallel connected diode switches. However, to obtain AND instead of OR function according to De Morgan's laws, the input and output logical variables are inverted:

Y = NOT (NOT (X1) OR NOT (X2)) = NOT (NOT (X1 AND X2)) = X1 AND X2,

where X1 and X2 are the two input logical variables; Y is the output variable.

Therefore, the diode AND logic gate is a modified diode OR logic gate: the diode AND gate is actually a diode OR gate with inverted inputs and output.

Read more about this topic:  Diode Logic, Diode Logic Gate Versions, AND Logic Gate

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