What is positive and negative logic gates?

What is positive and negative logic gates?

Positive logic is defined as a high voltage level representing a logic 1 and a low voltage level representing a logic 0. Negative logic is the reverse, i.e., a low voltage level represents a logic 1 and a high voltage level represents a logic 0.

What is positive logic gate?

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).

What is negative logic AND gate?

A Negative-AND gate functions the same as an AND gate with all its inputs inverted (connected through NOT gates). In keeping with standard gate symbol convention, these inverted inputs are signified by bubbles.

WHY IS AND gate equivalent of positive logic OR gate in negative logic?

(Hint) To change a positive-logic gate to a negative-logic gate is to complement all inputs and output of the gate at the same time. A positive-logic NAND gate implements the function (xy)’. Hence a negative-logic NAND gate implements ((x’y’)’)’ = (x+y)’, which is NOR function.

What is the meaning of negative Logic?

Negative Logic is a logical circuitry in which higher voltage level refers to LOW (‘0’ or FALSE) and Lower voltage level refers to HIGH(‘1’ or TRUE)

What is positive and negative meaning?

In the simplest sense, positive means good — or the opposite of negative.

What is a negative logic system?

How many universal gates are?

We have two universal gates – NAND gate and NOR gate. Note: The NAND gate is the abbreviation for Not AND and the NOR gate is the abbreviation for Not OR. In digital circuits we mostly use the NANA and the NOR gate to perform the operation of all the gates because these gates are economical and easier to fabricate.

WHAT IS AND gate and its truth table?

The AND gate is a basic digital logic gate that implements logical conjunction (∧) from mathematical logic – it behaves according to the truth table above. A HIGH output (1) results only if all the inputs to the AND gate are HIGH (1). If none or not all inputs to the AND gate are HIGH, LOW output results.

Is negative and and NAND the same?

A negative-OR as shown in post #2 must not be considered as a NAND gate (even though it may be implemented with a 7400 NAND gate). The output is TRUE (HIGH) if either input is ACTIVE-LOW.