Positive Logic And Negative Logic Pdf

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positive logic and negative logic pdf

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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. 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. 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.

Classical and Quantum Computing pp Cite as. A digital electronic system uses a building-block approach. Many small operational units are interconnected to make up the overall system.

Logic Signal Voltage Levels

Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. Top-down design process for gate-level combinational logic design Abstract: A pedagogical process for designing gate-level combinational logic circuits is described. The process can be used for either combinational logic circuits or the combinational logic sections of sequential logic circuits.

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A logic gate is an idealized model of computation or physical electronic device implementing a Boolean function , a logical operation performed on one or more binary inputs that produces a single binary output. Depending on the context, the term may refer to an ideal logic gate , one that has for instance zero rise time and unlimited fan-out , or it may refer to a non-ideal physical device [1] see Ideal and real op-amps for comparison. Logic gates are primarily implemented using diodes or transistors acting as electronic switches , but can also be constructed using vacuum tubes , electromagnetic relays relay logic , fluidic logic , pneumatic logic , optics , molecules , or even mechanical elements. With amplification, logic gates can be cascaded in the same way that Boolean functions can be composed, allowing the construction of a physical model of all of Boolean logic , and therefore, all of the algorithms and mathematics that can be described with Boolean logic. Logic circuits include such devices as multiplexers , registers , arithmetic logic units ALUs , and computer memory , all the way up through complete microprocessors , which may contain more than million gates.

In a perfect world, all logic circuit signals would exist at these extreme voltage limits, and never deviate from them i. However, in reality, logic signal voltage levels rarely attain these perfect limits due to stray voltage drops in the transistor circuitry, and so we must understand the signal level limitations of gate circuits as they try to interpret signal voltages lying somewhere between full supply voltage and zero. If a voltage signal ranging between 0. Such a signal would be considered uncertain , and no logic gate manufacturer would guarantee how their gate circuit would interpret such a signal. As you can see, the tolerable ranges for output signal levels are narrower than for input signal levels, to ensure that any TTL gate outputting a digital signal into the input of another TTL gate will transmit voltages acceptable to the receiving gate. The difference between the tolerable output and input ranges is called the noise margin of the gate.


The Positive Logic OR gates output achieves its ACTIVE state, (HIGH), when “one or more of its inputs” achieve their ACTIVE state, (HIGH). The Negative Logic OR gates output achieves its ACTIVE state, (LOW), when “all of its inputs” achieve their ACTIVE state, (LOW).


Logic Gates

Thus, the more positive voltage causes the action to take place. On the other hand, if a circuit requires a logic 0 to cause action, this type circuit is referred to as negative logic. There is nothing negative or positive about these various circuits.

What is the difference between positive and negative logic in digital I/O circuits?

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Logic is a discipline which seeks to clarify and explain matters through coherent, methodical reasoning, one branch of which is algebra Boolean algebra. Algebra dichotomizes all phenomena as true and false and considers their essential nature through combinations thereof. Phenomena to be characterized as true and false are expressed as variables denoted by terms such as A, B, and C. The values which these variables assume, for example, "true", are expressed as 1, and "false" as 0. Combinations of logical variables are referred to as logical expressions, and three basic functions are used to construct these expressions: logical product AND operations , logical summing OR operations , and negation. You are probably familiar with questions such as whether something operates in AND fashion or OR fashion, and this is an issue of logical expression. Logical variables and their results in 1 and 0 form, arranged in tabular form, are known as a truth table.

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