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A rational function whose numerator degree exceeds its denominator degree by more than one cannot directly represent the driving-point impedance of a finite passive RLC network because it violates the usual?

  • APositive-real realizability requirements
  • BKCL sign convention only
  • CNode numbering rule
  • DTransformer turns-ratio rule
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Correct Answer: A. Positive-real realizability requirements
Explanation: Finite passive RLC driving-point immittances are positive-real rational functions with constrained high-frequency behavior; an excessive degree difference is incompatible with those realizability conditions.
Reference: Standard network theory: realizability condition
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