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Noise suppressor

A suppressor, noise technology, applied in the field of noise suppressor, can solve problems such as interference

Pending Publication Date: 2021-06-18
吴宗霖
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] like figure 1 Shown is a reflective common-mode noise filter 1 applied to a high-speed digital transmission interface. The reflective common-mode noise filter 1 is used to transmit differential signals and reflect common-mode noise, but due to high-speed digital transmission The interface is electrically connected to other circuit components of peripheral modules, such as wireless transmitters, and the reflected common-mode noise may also flow to other circuit components, causing interference to peripheral modules. Therefore, how to suppress common-mode noise while reducing Interference caused by common mode noise reflection is the direction of recent research

Method used

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no. 2 example

[0101] Such as Figure 28 As shown, the difference between the second embodiment of the noise suppressor of the present invention and the first embodiment is that the first differential mode transmission module 2 includes a first differential mode circuit 25 and a second differential mode circuit 35, The second differential mode transmission module 3 includes a third differential mode circuit 45 and a fourth differential mode circuit 55, the first to fourth differential mode circuits 25, 35, 45, 55 have different component structures, or The four differential mode circuits 25 , 35 , 45 , 55 have the same element structures but different element values.

[0102] In summary, the advantage of the above-mentioned embodiment is that the common-mode noise is absorbed by the common-mode absorption module 4, so that the differential-mode noise originally from the pair of first ends 21 of the first differential-mode transmission module 2 exists simultaneously After the signal and comm...

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Abstract

A noise suppressor comprises a first differential mode transmission module, a second differential mode transmission module and a common mode absorption module. The first differential mode transmission module comprises a pair of first ends, a pair of second ends and a third end. The second differential mode transmission module comprises a pair of first ends electrically connected with the pair of second ends of the first differential mode transmission module respectively, a pair of second ends and a third end. The common mode absorption module comprises a first end electrically connected with the third end of the first differential mode transmission module and a second end electrically connected with the third end of the second differential mode transmission module. The first differential mode transmission module and the second differential mode transmission module allow a differential signal to pass through, and the common mode absorption module absorbs a common mode noise relative to the differential signal from the first differential mode transmission module and the second differential mode transmission module. The common-mode noise is absorbed by the common-mode absorption module, and the common-mode noise is substantially prevented from being leaked to other elements due to reflection.

Description

technical field [0001] The invention relates to a noise suppressor, in particular to a common-mode noise suppressor. Background technique [0002] Differential transmission is widely used in high-speed digital transmission systems because of its excellent anti-interference ability. However, in an actual system, due to non-ideal factors such as structural asymmetry, length mismatch, and through-layer vias on the circuit board, the signal energy will undergo mode conversion from differential mode to common mode, resulting in common mode noise, and thus generate radiated interference both inside and outside the system. In the past, in order to reduce radiation interference, common-mode noise suppressors were often used to reflect common-mode noise. [0003] Such as figure 1 Shown is a reflective common-mode noise filter 1 applied to a high-speed digital transmission interface. The reflective common-mode noise filter 1 is used to transmit differential signals and reflect comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/08H04L25/02
CPCH04L25/085H04L25/0272H04L25/0278H03H7/427H03H7/1758H03H7/1791H03H7/1733H03H7/0115
Inventor 吴宗霖林晋毅黄扬智
Owner 吴宗霖