Difference between Positive Logic and Negative Logic in Digital Electronics

Positive Logic: With reference to positive logic, logical 1 state is the most positive logic or voltage level and logic 0 state is the most negative logic or voltage level. In other words, active high level is 1 and active low level is 0. For instance, V(0) = 0V and V(1) = 5V, V(0) = 5V and V(1) = 15V.
Positive Logic
Positive Logic Table
Negative Logic: With reference to negative logic, logic 0 state is the most positive logic or voltage level and logic 1 state is the most negative logic or voltage level. In other words, active high level is 0 and active low level is 1. For instance, V(0) = 5V and V(1) = 0V, V(0) = 15V and V(1) = 5V.

Negative Logic
Negative Logic Table
Thus a positive logic AND gate acts as a negative logic OR gate and vice versa.

Hope you find the information presented here useful. Please leave your footprints in the comments section below for any feedback or queries.

 

    • Thanks ujju for the positive feedback. If I am assuming correct, you are taking about demonstrating positive/negative logic by creating circuits on bread board, is that correct?

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