**Positive logic:** If the signal that activates the logic gate has for its high (1) level a voltage more positive than for its low (0) level then the polarity of the logic is called positive logic, as shown in Fig. 10.21(a).

**Negative logic:** If the signal that activates the logic gate has for its high (1) level a voltage more negative than for its low (0) level then the polarity of the logic is called negative logic, as shown in Fig. 10.21(b).

**Logic circuit conversion:** A circuit using a positive (negative) logic can be converted into a circuit performing the same logic function but with a negative (positive) logic by following the procedure listed below.

Step 1. Reverse the polarities ...

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