COMMON MODE FILTER AND ESD-PROTECTION-CIRCUIT-EQUIPPED COMMON MODE FILTER

摘要

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.

主权项

1. 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.