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Common mode filter

a filter and common mode technology, applied in the field can solve the problems of increasing the time course of design, reducing the efficiency of impedance matching, and reducing so as to improve the efficiency of common mode filters

Active Publication Date: 2022-09-15
HTC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a common mode filter that improves efficiency by dynamically adjusting a passband through a capacitor or inductor on the filtering frequency adjusting device. This results in improved performance of the filter.

Problems solved by technology

In this way, when a peripheral circuit applied to the circuit board changes, a designer needs to redesign the layout of the slot structure and the transmission wire, which increases the time course of design.
In a limited space, it is probably unable to produce a suitable slot structure effectively, and may cause poor performance in impedance matching.

Method used

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Embodiment Construction

[0015]Referring to FIG. 1, FIG. 1 is a schematic diagram of a common mode filter according to an embodiment of the invention. The common mode filter 100 of the embodiment of the invention is disposed on a circuit board 10. An active layer of the circuit board 10 is provided with a differential signal wire pair composed of differential signal wires WIR1 and WIR2. The common mode filter 100 includes a slot structure 110 and a filtering frequency adjusting device 120. The slot structure 110 is disposed on a reference voltage layer of the circuit board 10, where the reference voltage layer and the active layer may be located in different layers of the circuit board 10, and the reference voltage layer and the active layer may be overlapped with each other. The reference voltage layer may be electrically coupled to a ground voltage or a power supply voltage, and may be used as a reference plane for a differential signal pair transmitted by the differential signal wires WIR1 and WIR2.

[0016...

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PUM

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Abstract

A common mode filter is disposed on a circuit board. A signal layer of the circuit board has a differential signal wire pair. The common mode filter has a slot structure and a filtering frequency adjusting device. The slot structure is formed on a reference voltage layer of the circuit board, wherein the slot structure surrounds the differential signal wire pair. The filtering frequency adjusting device is disposed on a corner part of the slot structure, wherein the filtering frequency adjusting device includes at least one of at least one capacitor and at least one inductor, and is disposed on the circuit board across the differential signal wire pair.

Description

BACKGROUNDTechnical Field[0001]The invention relates to a common mode filter, and particularly relates to a common mode filter disposed on a printed circuit board and capable of performing filtering frequency adjustment.Description of Related Art[0002]In the conventional technical field, in a common mode filter generated through a circuit layout, a center frequency of a passband thereof is often controlled by a length of a slot structure on a circuit board and a length of a transmission wire. In this way, when a peripheral circuit applied to the circuit board changes, a designer needs to redesign the layout of the slot structure and the transmission wire, which increases the time course of design. In addition, the formation of the slot structure needs to match the topography of the layout of the circuit board. In a limited space, it is probably unable to produce a suitable slot structure effectively, and may cause poor performance in impedance matching.SUMMARY[0003]The invention is ...

Claims

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Application Information

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IPC IPC(8): H03H7/01H05K1/02
CPCH03H7/0115H05K1/0245H05K1/0216H05K2201/09036H01P1/2016H03H7/0123H03H7/427H03H2001/0021H05K2201/1006H05K1/0233
Inventor CHANG, CHE-JUNGGAO, WEI-HONGHO, CHIA-CHU
Owner HTC CORP