Common-mode signal band elimination structure, common-mode signal band elimination circuit and digital interface circuit

By setting a ground wire structure with a serpentine trace on the ground reference surface to increase the return path length of the common mode current, the problem of common mode inductors in the prior art increases the circuit cost and low versatility, and efficient common mode signal suppression and data transmission reliability are achieved.

CN222672735UActive Publication Date: 2025-03-25HEFEI LCFC INFORMATION TECH
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Patent Information

Application Number
CN202420494582.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-03-14
Publication Date
2025-03-25
Estimated Expiration
2034-03-14

AI Technical Summary

Technical Problem

When using common mode inductors for signal suppression in the prior art, circuit costs are increased and versatility is low, which cannot meet some design needs.

Method used

A common mode signal band resistance structure is designed. By setting a ground wire structure with a serpentine trace on the ground reference surface, the return path length of the common mode current is increased, thereby increasing the common mode impedance and realizing the common mode signal band resistance characteristics.

Benefits of technology

Without increasing differential mode impedance, a sufficiently high common mode impedance is designed to effectively suppress common mode noise, meet design requirements, and ensure the reliability and stability of data transmission. In addition, the structure has higher versatility and can adapt to more usage scenarios by changing the length and layout of the serpentine traces.

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Abstract

The utility model relates to the technical field of common-mode signal filtering, in particular to a common-mode signal band elimination structure, a common-mode signal band elimination circuit and a digital interface circuit, and the structure comprises two differential signal lines which are arranged at an interval, and a grounding reference plane which is parallel to the plane where the differential signal lines are located; a hollowed-out hole is formed in the position, below the differential signal line, of the grounding reference face, a snakelike wire is arranged in the hollowed-out hole, and the two ends of the snakelike wire are connected with the grounding reference face respectively. According to the ground wire structure of the snakelike routing, the backflow path length of common-mode current can be increased, so that the common-mode impedance within a certain frequency range can be increased, the band elimination characteristic of common-mode signals is achieved, and the sufficiently high common-mode impedance is designed on the premise that the differential-mode impedance is not increased. A common-mode signal band elimination structure is used for replacing an existing common-mode inductor structure, filtering design is carried out on a digital signal interface circuit with radiation emission exceeding the standard easily occurring at a specific frequency point, common-mode noise is restrained, the design requirement is met, and reliability and stability of data transmission are guaranteed.
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