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Network TheoryNetwork Synthesis

For a positive-real function F(s), the real part Re[F(j omega)] at frequencies where F is finite must be?

  • ANonnegative
  • BStrictly negative
  • CAlways zero
  • DPurely imaginary
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Correct Answer: A. Nonnegative
Explanation: A key boundary property of a positive-real function is Re[F(j omega)]>=0 wherever the function is finite.
Reference: Standard network theory: positive-real frequency-axis condition
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