Comparing binary numbers To determine which of two binary numbers is larger (>, =, <), the appropriate digital circuit to use is a ________.

Introduction / Context:
Comparing two binary quantities is a recurring need in CPUs, ALUs, sorting hardware, and control logic. Dedicated magnitude comparators perform this function efficiently in combinational logic, providing outputs for A>B, A=B, and A

Given Data / Assumptions:

• Inputs: two N-bit binary numbers A and B.
• Outputs: flags indicating greater-than, equal, or less-than.
• No sequencing or storage is required for pure comparison.

Concept / Approach:
A magnitude comparator evaluates bits from MSB to LSB, using logic to determine the first position where A and B differ and to propagate equality otherwise. ICs like the 74xx85 implement this in hardware and can be cascaded for wider words using carry-like cascade inputs/outputs.

Step-by-Step Solution:

Verification / Alternative check:
While subtraction (A−B) using an adder could infer comparison via sign/zero flags, a magnitude comparator provides the logic explicitly and is the standard component for this job.

Why Other Options Are Wrong:

• Register: Stores data; does not compare.
• Adder: Can assist via subtraction, but is not the direct comparison circuit.
• Encoder: Maps many inputs to a coded output; unrelated.
• Binary counter: Sequences numbers; not a comparator.

Common Pitfalls:
Assuming arithmetic units are necessary for comparison; dedicated comparators save logic, timing, and design complexity.

Final Answer:
magnitude comparator