Low voltage differential signaling (LVDS) cable shielding method

A cable and shielding layer technology, applied in the shielding field of LVDS cables, can solve problems such as exceeding the limit requirements, and achieve the effects of reducing crosstalk, improving noise immunity, and optimizing electromagnetic shielding performance

Inactive Publication Date: 2013-03-13
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology

However, limited by the traditional process, the shielding layer of the cable is cut off at a distance of 5mm-20mm from the connector, and the gap is only insulated, which becomes the main way for the radiation emission of the cable
When a single machine using this cable is used for radiated emission tests, it often exceeds the limit requirements

Method used

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  • Low voltage differential signaling (LVDS) cable shielding method
  • Low voltage differential signaling (LVDS) cable shielding method
  • Low voltage differential signaling (LVDS) cable shielding method

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Embodiment Construction

[0019] Generally, the spacecraft has multiple radio frequency devices that use LVDS cables and transmit signals in the cables. The clock signal is the most common one, and its signal form is as follows: figure 1 Shown, tr: rise time; tf: fall time; τ: pulse width; T: period; A: amplitude. This type of signal contains rich high-frequency components, and it is easy to radiate electromagnetic waves into space. Due to the discontinuous shielding between the cable shielding layer and the connector, there is a gap of about 5mm-20mm; at the same time, the unused cores in the cable and the connector also provide a way for the internal signal of the device to radiate outward, resulting in the clock and its harmonics. Wave signal leakage makes the radio frequency stand-alone with LVDS cables generally have out-of-tolerance radiation emission test items, and the out-of-tolerance frequency points are concentrated at the clock and its harmonic frequency points. In the self-compatibility t...

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Abstract

A low voltage differential signaling (LVDS) cable shielding method includes steps: (1) a shielding layer and an insulation layer which are arranged at one end of a cable are stripped to expose a cable core, the cable core and a contact pin of a corresponding connector are processed in connection mode, and the stripped shielding layer and the stripped insulation layer are removed, wherein the LVDS cable comprises the connector and the cable, and the cable core, the shielding layer and the insulation layer are sequentially arranged on the cable from inside to outside; (2) the insulation layer arranged on the portion of the cable obtained from the step (1) close to the connector is re-stripped to expose the shielding layer; and (3) shielding materials are used for shielding layer secondary reinforcing processing. The LVDS cable shielding method greatly reduces transmitting quantity value of outward radiation of the LVDS cable, optimizes the electromagnetic shielding performance of the cable, and accordingly enables the radiation index of a radio frequency one machine provided with the cable to be enhanced, and ensures completing of space navigation model tasks.

Description

technical field [0001] The invention relates to a shielding method of an LVDS cable, belonging to the technical field of cable signal shielding. Background technique [0002] LVDS (Low Voltage Differential Signaling low-voltage differential signal) cable is a cable widely used in aerospace products. LVDS signal is a low-voltage swing differential signal technology with higher bit rate, lower power consumption and More stable reliability and widely used. However, limited by the traditional technology, the shielding layer of the cable is cut off at a distance of 5mm-20mm from the connector, and the gap is only insulated, which becomes the main way of cable radiation emission. When a single machine using this cable is used for radiated emission tests, it often exceeds the limit value requirements. This phenomenon widely occurs in various aerospace products using LVDS cables, and it is urgent to improve the shielding design method to meet the application requirements of the mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B13/22
Inventor 李冉徐军倪子楠盛北飞陈海波张亚洁李红林刘晓
Owner BEIJING INST OF SPACECRAFT SYST ENG
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