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.
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