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How does the self-resonant frequency of a common-mode inductor affect its filtering effect?

Time：2025-12-30 Views：49次

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The self-resonant frequency (SRF) of a common-mode inductor is determined by inductance and parasitic capacitance. When the noise frequency approaches the SRF, impedance peaks, achieving optimal filtering performance; beyond the SRF, parasitic capacitance dominates, impedance decreases, and filtering performance deteriorates. During design, it is necessary to ensure that the SRF is higher than the target noise frequency band.

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