Which gate outputs 1 when the inputs are equal (both 0 or both 1)?

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Study for the AAMI Certified Associate in Biomedical Technology Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which gate outputs 1 when the inputs are equal (both 0 or both 1)?

Explanation:
The gate that outputs 1 when the inputs are equal is the XNOR gate, which acts as an equality detector. It gives 1 for both 0,0 and 1,1, and 0 for 0,1 or 1,0. You can think of it as the inverse of XOR: XOR outputs 1 when the inputs differ, so flipping that result yields 1 exactly when the inputs match. The OR gate would produce 1 whenever at least one input is 1, including 1,1, so it doesn't match the requirement. The NOT gate only inverts a single input, so it can’t compare two inputs either.

The gate that outputs 1 when the inputs are equal is the XNOR gate, which acts as an equality detector. It gives 1 for both 0,0 and 1,1, and 0 for 0,1 or 1,0. You can think of it as the inverse of XOR: XOR outputs 1 when the inputs differ, so flipping that result yields 1 exactly when the inputs match. The OR gate would produce 1 whenever at least one input is 1, including 1,1, so it doesn't match the requirement. The NOT gate only inverts a single input, so it can’t compare two inputs either.

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