The basic overview of copper clad and the difference between positive and negative copper skins
1. Positives and Negatives
Copper skin has positive and negative points:
Positive film: WYSIWYG in the film, the black area is a copper-filled area, and the white area is a via and a pad. With positive copper, it is not necessary to consider the Thermal Relief when creating pads.
Negative: In contrast to the positive, black areas are vias and pads, and white areas are filled with copper. With negative copper, it is necessary to add a Thermal Relief when creating pads. The advantage of the positive film is that if the moving element or vias need to be re-coppered, there is a more comprehensive DRC check.
The advantage of the negative film is that the moving components or vias do not need to be re-coppered, and the copper is automatically renewed. There is no comprehensive DRC check.
1. When the copper cover covers the pad, it must be completely covered. The shape and pad cannot form an acute angle.
2. Try to use copper instead of thick wire. When using thick lines, the vias are usually best not to trace through vias, increasing the via hole and pad.
3. Try to replace the pattern of copper and copper traces with copper. The latter often produces some small sharp corners and right angles. Replace copper traces with copper:
The boundary of 4.shape must be on the grid point, grid-off is not allowed. (sony specification)
5. Shape corners must be of the same size. As shown in the figure below, both corners of the corner are 4 grid points, so all the small corners must do this. (sony specification) 8. Strictly speaking, shape & shape, shape & line must be equally spaced. If you set the shape and line 0.3mm, spacing, then all shape spacing should be so, can not exist 0.4mm or 0.25mm like The situation, but in order to keep the grid of copper, is the spacing of grids on the premise of meeting the 0.3mm spacing.
9. The housing of the plug, and the inductance and resistance connected to the housing ground, and the GND at the other end of the resistor, preferably copper-clad 10. The copper-clad connection of the housing of the plug is preferably in the form of an 8-angle rather than a Full Connect.
11. The GND terminal of the capacitor is best to enter the inner ground directly through the via hole. Do not connect through the copper skin. The latter is not conducive to welding, and the copper skin in the small area is meaningless.
12. The connection of the power supply, especially the power pin output from the power chip is preferably connected by copper
13.PCB, even if there are a large number of blank areas, if the spacing of the signal lines is large enough, no surface copper clad ground is needed. The partial copper coating on the surface will cause uneven balance of the copper foil on the circuit board. And if copper is too close to the trace, the impedance of the trace will be affected by the copper.
14. Due to space constraints, GND cannot be approached through the via to the inner ground. This can be done through partial copper and then through the via and the inner ground.
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