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Pulse and Digital Circuits by Manmadha Rao G., Rama Sudha K., Venkata Rao K.

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10.4 POSITIVE LOGIC, NEGATIVE LOGIC AND LOGIC CIRCUIT CONVERSION

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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