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US 9,755,606 B2Granted
Common mode filter and ESD-protection-circuit-equipped common mode filter
AssigneeMurato Manufacturing Co., Ltd.
InventorsNoriyuki Ueki, Hisashi Akiyama
Life of this patent
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Abstract
On a first-signal-line side, a first resonant circuit is defined by a first inductance element, a first capacitance element, a second capacitance element, a third inductance element and a fifth inductance element, a third resonant circuit is defined by the first inductance element, the first capacitance element and the second capacitance element, and a fifth resonant circuit is defined by the first inductance element, the third inductance element, the first capacitance element, the second capacitance element and the fifth capacitance element. Similarly, on a second-signal-line side, a second resonant circuit, a fourth resonant circuit and a sixth resonant circuit are provided.
Claims15
A common mode filter that is to be inserted into a first signal line and a second signal line of a differential transmission line, the common mode filter comprising:
- a first inductance element that is to be inserted in series with the first signal line;
- a second inductance element that is to be inserted in series with the second signal line;
- a third inductance element that includes a first end connected to a neutral point with respect to the first signal line and the second signal line;
- a fourth inductance element that includes a first end connected to the neutral point;
- a first capacitance element that is connected between the first end of the first inductance element and a second end of the third inductance element;
- a second capacitance element that is connected between a second end of the first inductance element and the second end of the third inductance element;
- a third capacitance element that is connected between the first end of the second inductance element and a second end of the fourth inductance element;
- a fourth capacitance element that is connected between a second end of the second inductance element and the second end of the fourth inductance element;
- a fifth inductance element that is connected between the neutral point and ground;
- and
- a fifth capacitance element that is connected between the neutral point and ground;
- wherein
- a first resonant circuit is defined by the first inductance element, the first capacitance element, the second capacitance element, the third inductance element and the fifth inductance element;
- a second resonant circuit is defined by the second inductance element, the third capacitance element, the fourth capacitance element, the fourth inductance element and the fifth inductance element;
- a third resonant circuit is defined by the first inductance element, the first capacitance element and the second capacitance element;
- a fourth resonant circuit is defined by the second inductance element, the third capacitance element and the fourth capacitance element;
- a fifth resonant circuit is defined by the first inductance element, the third inductance element, the first capacitance element, the second capacitance element and the fifth capacitance element;
- and
- a sixth resonant circuit is defined by the second inductance element, the fourth inductance element, the third capacitance element, the fourth capacitance element and the fifth capacitance element.
16 more elements
A common mode filter that is to be inserted into a first signal line and a second signal line of a differential transmission line, the common mode filter comprising:
- a first inductance element that is to be inserted in series with the first signal line;
- a second inductance element that is to be inserted in series with the second signal line;
- a third inductance element that includes a first end connected to a neutral point with respect to the first signal line and the second signal line and includes a second end connected to the first signal line;
- a fourth inductance element that includes a first end connected to the neutral point and includes a second end connected to the second signal line;
- a fifth inductance element that is connected between the neutral point and ground;
- and
- a fifth capacitance element that is connected between the neutral point and ground;
- wherein
- an attenuation pole that attenuates common mode noise is provided inside a passband by a resonant circuit defined by the fifth inductance element and the fifth capacitance element.
6 more elements
A common mode filter that is to be inserted into a first signal line and a second signal line of a differential transmission line, the common mode filter comprising:
- a first inductance element that is to be inserted in series with the first signal line;
- a second inductance element that is to be inserted in series with the second signal line;
- a third inductance element that includes a first end connected to a neutral point with respect to the first signal line and the second signal line and includes a second end connected to the first signal line;
- a fourth inductance element that includes a first end connected to the neutral point and includes a second end connected to the second signal line;
- a fifth inductance element that is connected between the neutral point and ground;
- a first shunt connection capacitance element that is connected between the first inductance element and the third inductance element;
- and
- a second shunt connection capacitance element that is connected between the second inductance element and the fourth inductance element;
- wherein
- an attenuation pole is provided by a series resonant circuit including the first shunt connection capacitance element, the third inductance element and the fifth inductance element and a series resonant circuit including the second shunt connection capacitance element, the fourth inductance element and the fifth inductance element, and an attenuation pole is provided by a parallel resonant circuit including the first inductance element and the first shunt connection capacitance element and a parallel resonant circuit including the second inductance element and the second shunt connection capacitance element.
7 more elements
A common mode filter that is to be inserted into a first signal line and a second signal line of a differential transmission line, the common mode filter comprising:
- a first inductance element that is to be inserted in series with the first signal line;
- a second inductance element that is to be inserted in series with the second signal line;
- a third inductance element that includes a first end connected to a neutral point with respect to the first signal line and the second signal line and includes a second end connected to the first signal line;
- a fourth inductance element that includes a first end connected to the neutral point and includes a second end connected to the second signal line;
- and
- a fifth capacitance element that is connected between the neutral point and ground;
- a first shunt connection capacitance element that is connected between the first inductance element and the third inductance element;
- and
- a second shunt connection capacitance element that is connected between the second inductance element and the fourth inductance element;
- wherein
- an attenuation pole is provided by a series resonant circuit including the first shunt connection capacitance element, the third inductance element and the fifth capacitance element and a series resonant circuit including the second shunt connection capacitance element, the fourth inductance element and the fifth capacitance element, and an attenuation pole is provided by a parallel resonant circuit including the first inductance element and the first shunt connection capacitance element and a parallel resonant circuit including the second inductance element and the second shunt connection capacitance element.
8 more elements
Dependencies are inferred from the claim text.