Definition

1. Noun:
   • A logic gate: An "or gate" is a fundamental building block in digital electronics and computer circuits. It is a type of logic gate that implements the logical disjunction (OR) operation.
   • Its function: The output of an "or gate" becomes active (typically a logical '1' or HIGH voltage) when any one or more of its inputs are active. Its output is inactive (logical '0' or LOW) only when all of its inputs are inactive.

Usage Examples

• Noun:
  • The circuit design requires an or gate to combine the signals from the two sensors.
  • If either input A or input B is high, the output of the or gate will be high.
  • A basic or gate has two inputs, but they can be designed with three or more.

Advanced Usage

• Logical Symbol and Truth Table: The "or gate" is represented in circuit diagrams by a distinct shape (often curved). Its behavior is formally defined by a truth table that lists the output for every possible combination of inputs.
• In Boolean Algebra: The operation of an "or gate" is represented by the plus sign (+) or the symbol ∨. For example, the expression Q = A + B means the output Q is true if A is true OR B is true.

Variants and Related Words

• OR (conjunction): The logical operation itself, meaning "at least one of the alternatives is true."
• Logic gate (noun): The general category of circuits that includes the "or gate," "and gate," "not gate," etc.
• Inclusive OR: This is the specific type of OR implemented by a standard "or gate," where the output is true if inputs are true. (This contrasts with an "exclusive OR gate" or XOR gate, which is a different component).

Synonyms

• Logical OR circuit
• Disjunction gate (formal/technical)

Related Phrases/Concepts

• Input/Output: Terms used to describe the signals entering and leaving the gate.
• Truth Table: A table showing all possible input combinations and the corresponding output.
• Boolean logic: The system of algebra and logic upon which digital circuits and "or gate" operation are based.

Noun

1. a gate circuit in a computer that fires when any of its inputs fire