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← ScienceWhich mechanism increases RF noise floor when PCB trace impedance mismatch?
A)Capacitive parasitic oscillations✓
B)Inductive coupling feedback
C)Transmission line resonance
D)Thermionic emission amplification
💡 Explanation
Because impedance mismatches create reflections, energy is trapped, exciting parasitic capacitance on traces initiating spurious oscillations; a form of EMI. These oscillations introduce unwanted frequencies, therefore noise increases rather than resonance, which requires specific trace lengths.
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