Comparator definition — Evaluate: “A device that determines which of two numbers is greater is a comparator.”

Question

Solve this multiple-choice question and choose the correct option.

Accepted Answer

Introduction / Context: Comparators are used to determine ordering between two inputs. In digital logic, magnitude comparators output signals indicating A>B, A=B, or AGiven Data / Assumptions: “Numbers” may refer to digital binary words or analog magnitudes represented as voltages/currents. We focus on the core function—establishing greater/less/equal relationships. Implementation details (bit width, technology) do not change the definition. Concept / Approach: A comparator’s essential behavior is to compare two inputs and assert outputs representing relative magnitude. Digital magnitude comparators (e.g., 74×85) produce A>B, A=B, AStep-by-Step Solution: Identify inputs A and B.Evaluate their magnitudes; hardware sets outputs accordingly.Use the outputs to steer subsequent logic (select max, trigger thresholds, etc.). Verification / Alternative check: Datasheets and textbooks define comparators by their ability to indicate relative size or threshold crossing. Why Other Options Are Wrong: Incorrect: Conflicts with standard definitions in both digital and analog domains.Only true for analog signals: Digital comparators exist; the definition is broader.Only true for 8-bit data: Bit width is irrelevant; comparators scale to various widths. Common Pitfalls: Confusing a comparator with a subtractor; subtractors compute differences, comparators report ordering.Assuming a comparator outputs the larger value; that requires a multiplexer controlled by the comparator. Final Answer: Correct

Comparator definition — Evaluate: “A device that determines which of two numbers is greater is a comparator.”

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