Printed circuit board
A technology of printed circuit board and power layer, which is applied in the direction of printed circuit components to achieve the effect of preventing noise coupling
Inactive Publication Date: 2012-02-01
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Problems solved by technology
Because the audio signal line is a single slow line, it is easy to be coupled by noise on the printed circuit board. These noises may come from other circuits or power planes, ground planes, etc. When doing system electromagnetic interference measurement, these noises The signal cable connected to the audio input / output port will be used as a transmitting antenna, causing electromagnetic radiation problems
Method used
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[0030] Please refer to Figure 1 to Figure 3 A preferred embodiment of the printed circuit board 100 of the present invention includes a first signal layer 110, a power layer 120, a ground layer 130, and a second signal layer 140, and a dielectric layer is provided between each adjacent two layers (unlabeled), one side of the first signal layer 110 is provided with an analog audio input / output port 200, an audio chip 300 is arranged on the first signal layer 110 and is located near the analog audio input / output port 200, It is used to control the input and output of the analog audio input / output port 200 . The audio chip 300 includes a body portion 310 and a number of signal pins disposed on the body portion 310. These signal pins include a first group of audio pins 320 connected to the analog audio input / output port 200 and external control ports. Chips such as the South Bridge chip 500 are connected to the second group of audio pins 330 (only a few wires 14 and 16 are drawn...
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The invention discloses a printed circuit board which comprises a signal layer, a power supply layer and a ground layer, wherein one side of the signal layer is provided with an analog audio input / output port; an audio chip is arranged on the signal layer and positioned near the analog audio input / output port; the audio chip comprises a chip body, a first set of audio pins and a second set of audio pins, the first set of audio pins are connected with the analog audio input / output port, and the second set of audio pins are connected with an external control chip; and the power supply layer and the ground layer are respectively divided into an audio part and a digital part by a dividing groove, the audio part is not electrically connected with digital part, the two audio parts are only used as reference planes of routing between the first set of audio pins and the analog audio input / output port, and the two digital parts are used as reference planes of routing between the second set of audio pins of the audio chip and the external control chip. By using the printed circuit board disclosed by the invention, the electromagnetic radiation generated by the analog audio input / output port can be reduced.
Description
technical field [0001] The invention relates to a printed circuit board. Background technique [0002] Currently, analog audio input / output ports are designed on printed circuit boards such as computer motherboards for users to access voice functions, such as microphones and speakers. Because the audio signal line is a single slow line, it is easy to be coupled by noise on the printed circuit board. These noises may come from other circuits or power planes, ground planes, etc. When doing system electromagnetic interference measurements, these noises The signal cable connected to the audio input / output port will be used as a transmitting antenna, causing electromagnetic radiation problems. Contents of the invention [0003] In view of the above, it is necessary to provide a printed circuit board that can reduce the electromagnetic radiation generated by the analog audio input / output port. [0004] A printed circuit board includes a signal layer, a power layer and a ground...
Claims
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IPC IPC(8): H05K1/02
Inventor 王政松
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD