Printed circuit board, design method thereof and mainboard of terminal product
First Claim
1. A printed circuit board, comprising outer surface layers and at least two inner layers between the outer surface layers, wherein:
- signal lines are arranged on an area basis on the at least two inner layers;
each of the outer surface layers of the printed circuit board is arranged with a metal sheet, wherein each of the outer surface layers is disposed on an outer surface of the printed circuit board;
the outer surface layers are interconnected by at least one through via, so that the outer surface layers function as a primary ground;
the printed circuit board does not include a ground plane at any of the at least two inner layers;
an interlayer distance between two adjacent inner layers is at least twice a distance from each of the two adjacent inner layers to a corresponding one of the outer surface layers closest to an inner layer;
the printed circuit board comprises at least three base plates and the outer surface layers and the at least two inner layers are formed on surfaces of the base plates; and
a number of layers of the at least two inner layers in the printed circuit board is two, and at least one BGA-packaged device is provide on the printed circuit board, a blind via in a BGD area is arranged below a pad of the BGA-packaged device, and a ground copper sheet with a large area in the BGA area is a mesh copper sheet.
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Accused Products
Abstract
A printed circuit board and a design method thereof are disclosed. The design method includes: wiring signal lines on an area basis at inner layers adjacent to outer surface layers; arranging the outer surface layers with no wiring or few wirings and interconnecting the outer surface layers through vias, so that the outer surface layers function as a primary ground; and setting parameters of a line width and a layer height to control a target impedance value. The printed circuit board includes outer surface layers and two inner layers therebetween. The inner layers adjacent to the outer surface layers are used for arranging signal lines on an area basis; and the outer surface layers are arranged with no wiring or few wirings and are interconnected as a primary ground through vias. The invention also discloses a mainboard of a terminal product using the printed circuit board.
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Citations
20 Claims
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1. A printed circuit board, comprising outer surface layers and at least two inner layers between the outer surface layers, wherein:
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signal lines are arranged on an area basis on the at least two inner layers; each of the outer surface layers of the printed circuit board is arranged with a metal sheet, wherein each of the outer surface layers is disposed on an outer surface of the printed circuit board; the outer surface layers are interconnected by at least one through via, so that the outer surface layers function as a primary ground; the printed circuit board does not include a ground plane at any of the at least two inner layers; an interlayer distance between two adjacent inner layers is at least twice a distance from each of the two adjacent inner layers to a corresponding one of the outer surface layers closest to an inner layer; the printed circuit board comprises at least three base plates and the outer surface layers and the at least two inner layers are formed on surfaces of the base plates; and a number of layers of the at least two inner layers in the printed circuit board is two, and at least one BGA-packaged device is provide on the printed circuit board, a blind via in a BGD area is arranged below a pad of the BGA-packaged device, and a ground copper sheet with a large area in the BGA area is a mesh copper sheet. - View Dependent Claims (2, 3)
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4. A mainboard of a terminal product, comprising a basedband or radio frequency core chip, wherein:
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the mainboard of the terminal product is a four-layer printed circuit board comprising surface layers and two inner layers between the surface layers; the surface layers comprise a top layer and a bottom layer, the top layer is configured as a primary reference ground layer consisting of a ground copper sheet with a large area, the bottom layer is interconnected with the top layer by through vias, and the inner layers are primary wiring layers where wiring areas are divided by functions; a distance between the inner layers is at least twice a distance between each of the surface layers and the inner layers adjacent to the surface layer; the wiring area at each of the inner layers corresponds to the ground copper sheet with the large area at a layer adjacent to the inner layer or vertically arranged traveling lines at the layer adjacent to the inner layer; and a blank area at the inner layers other than the wiring areas is grounded, the top layer is arranged as a keyboard arrangement side of the terminal product, the bottom layer is arranged as a primary device arrangement side of the terminal device, and audio lines are arranged at the inner layer adjacent to the top layer, and correspond to the keyboard arrangement side and avoid a projection of a keyboard pad at the inner layer adjacent to the top layer. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification