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Ground plane of printed circuit board

A printed circuit board and ground layer technology, applied in the directions of printed circuits, printed circuits, printed circuit components, etc., can solve problems such as poor noise filtering characteristics, and achieve the effect of reducing costs and filtering noise characteristics.

Inactive Publication Date: 2007-10-03
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Curve 16 in Figure 2 is the frequency and amplitude characteristic curve when the digital signal is input in Figure 1, it can be seen that when the input signal changes from 0.0003GHz to 6.0GHz, the curve 16 fluctuates above -40dB, and generally According to the design requirements, with -40dB as the benchmark, when the amplitude characteristic of the curve 16 is less than -40dB, the noise filtering characteristics of the capacitor 14 are good, and the curve 16 in Fig. 2 shows that the noise will pass through the digital ground 10 is transmitted to the analog ground 12, and the noise filtering characteristics are poor

Method used

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  • Ground plane of printed circuit board
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  • Ground plane of printed circuit board

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Embodiment Construction

[0014] Please refer to FIG. 3 , the printed circuit board ground layer includes a digital ground area 32 , an analog ground area 34 , hollow areas 31 , 33 , 35 , 39 and a connection portion 30 . The digital ground area 32 , the analog ground area 34 and the connecting portion 30 are made of copper foil. The digital ground area 32 is separated from the analog ground area 34 by the hollow areas 31 , 33 , 35 and 39 . The two hollowed out areas 35 and 39 are irregularly bent hollowed out areas respectively. The two hollow areas 35 and 39 surround the copper foil of the connecting portion 30 into an irregularly bent shape. One end of the connection part 30 is connected to the digital ground area 32 , and the other end is connected to the analog ground area 34 , which can filter out the noise of the digital ground area 32 to avoid entering the analog ground area 34 .

[0015] Curve 37 in FIG. 4 is the frequency and amplitude characteristic curve when the digital signal is input in...

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Abstract

The invention relates to a kind of grounding layer of the printed circuit board, including a digital region, an analog region and connecting unit. The described digital region and the analog region are connected by the described connecting unit, and the connecting unit has a hooked extension. In the invention, it replace the exiting straight line and patch-capacitance connecting with the hooked connecting between the digital and analog regions, which improves the filtering noise and reduces costs.

Description

【Technical field】 [0001] The present invention relates to a printed circuit board, in particular to a printed circuit board with a ground plane which can improve noise filtering characteristics. 【Background technique】 [0002] The ground layer of the printed circuit board generally includes a digital ground area and an analog ground area. The digital ground area is the common reference ground of zero potential of the digital circuit; the analog ground area is the common reference ground of the zero potential of the analog circuit. In order to prevent the signal in the digital circuit from being coupled into the analog circuit, the analog ground area and the digital ground area are connected at one point in the ground layer of the printed circuit board. However, the digital circuit works in a pulse state, especially when the front and rear edges of the pulse are steep or the frequency is high, a large amount of electromagnetic interference will be generated, and the electroma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05K1/02H05K1/11
CPCH05K1/0216H05K1/165H05K2201/093H05K2201/09663
Inventor 王迎新林有旭
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD