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Which of the following is an abstraction of the signal impedance?

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Which of the following is an abstraction of the signal impedance?

(a) level

(b) strength

(c) size

(d) nature

This question was posed to me during a job interview.

This interesting question is from Introduction to VHDL in portion Specification of Embedded Systems

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The correct answer is (b) strength

The best I can explain: The systems contain electrical signals of different strengths and it needs to compute the strength and the logic level resulting from a connection of two or more sources of electrical signals. The strength is the abstraction of the signal impedance.

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