Common mode filter
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United States of America Patent
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Sep 30, 2014
Grant Date -
Mar 29, 2012
app pub date -
Oct 13, 2010
filing date -
Nov 2, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
There is provided a common mode filter capable of allowing an ultrahigh speed differential signal to transmit and hardly allowing a common mode noise to transmit, comprising: a lumped-constant differential delay line DL formed by arranging inductors Lo, being passive series elements, and capacitors Co, being passive parallel elements, in a ladder-shaped differential four terminal network composed of the passive series elements and the passive parallel elements arranged in the differential lines 1, 3. In the lumped-constant differential delay line DL, the capacitors Co, being the parallel elements, are formed of two capacitors connected in series equivalent to each other and having same values with each other such as Co/2 and Co/2, or Co and Co. Inductors L1 to L4 and resistors R1 to R4 for attenuating the common mode noise are connected between connection points T1 to T4 of the capacitors Co/2 or Co connected in series, and a ground potential, thus forming a common mode noise attenuating series resonance circuit together with the capacitors Co/2, Co.
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