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Filter and electronic device

A filter element, a pair of technology, applied in the direction of electrical components, impedance network, multi-terminal pair network, etc., can solve the problems of affecting signal quality, difficult to balance, system reliability decline, etc., to achieve good anti-interference effect, wide operating frequency band, The effect of cost reduction

Inactive Publication Date: 2017-06-13
HEFEI LCFC INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the current design of common-mode inductors or serpentine traces has the following shortcomings that are difficult to overcome:
[0005] (1) High cost: if each port or each line is designed with a common mode inductance, the cost is too high;
[0006] (2) Low reliability: Because the structure and process of common mode inductors are complicated, and they are connected in series in the circuit, the reliability of the entire system will decrease;
[0007] (3) Large insertion loss: because the insertion loss is large, it affects the signal quality, making it difficult to balance between EMI and S I;

Method used

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  • Filter and electronic device
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Embodiment Construction

[0035] The embodiment of the present invention provides a filter device with low cost and high anti-common-mode interference efficiency. The filter device can be directly constructed on the circuit board without adding other electronic devices to achieve the function of filtering common mode signals, so it has the characteristics of low cost and no insertion loss.

[0036] specific, figure 1 It is a schematic structural diagram of a filter device in an embodiment of the present invention, figure 2 It is a schematic structural diagram of a filter device in another embodiment of the present invention.

[0037] Among them, such as figure 1 and 2 As shown, the filter device in the embodiment of the present invention may include a pair of differential signal input terminals 101a and 101b arranged on the circuit board 100, differential signal output terminals 102a and 102b, and a pair of differential signal input terminals 101a and 101b connected to the differential signal A ro...

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Abstract

The invention provides a filter and an electronic device. The filter at least comprises a pair of differential signal input ends and a pair of differential signal output ends arranged on a circuit board, and a circling circuit structure which is connected between the differential signal input ends and the differential signal output ends and is used for transmitting differential signal pairs. The circling circuit structure is constructed to enable transmitted differential signals to cancel generated magnetic field intensity according to a right hand rule and law. The filter and the electronic device are featured by low cost and good common-mode interference resistant effect.

Description

technical field [0001] The invention relates to the field of anti-common-mode interference devices, in particular to a filter device and electronic equipment. Background technique [0002] Various high-frequency circuits, digital circuits, and analog circuits are mixed on the motherboard of electronic equipment such as computers. When they work, they will generate a large number of high-frequency electromagnetic waves that interfere with each other, that is, EMI interference. EMI will also be emitted through the main board wiring or external cables, causing electromagnetic radiation pollution, interfering with the operation of communication channels and other electrical equipment, and making the equipment unable to meet the EMC regulations and directives of various countries. [0003] The principle of electromagnetic interference can be divided into differential mode interference and common mode interference. Compared with differential mode interference, common mode interfer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H1/00H03H7/01
CPCH03H1/00H03H7/01
Inventor 魏伟唐洪刚于慧洋
Owner HEFEI LCFC INFORMATION TECH