1) The PCB design small power supply is preferred to palate copper in the signal layer, followed by a circular connection to the carrier;
2) PCB Design 12V, 5V power supply If it is the input power supply of the switching power supply, it is preferentially processed (the surface layer, inner layer signal layer) at the signal layer, and if necessary, do not use the reference plane of the important signal line; It can effectively reduce the impact of such "high" pressure on signals;
3) PCB Design If the divided power plane is used as a reference plane of the signal, the power supply plane is prioritized as a signal reference plane of the electric module; if there are a plurality of power supplies, the power supply is preferentially referred to by the voltage; for example, DDR3, it is 1.5V. The 1.5V power supply plane can be used as the signal reference plane of the DDR3 module, but try not to refer to the 3.3V power supply or other power supply; (usually DDR3 data reference ground plane, address control signal reference power plane)
4) PCB design power plane and ground plane close neighbor, if the power plane is adjacent to the signal layer, try to make some GND copper in the signal layer, and play GND via;
5) PCB design dividing line width is reasonable; the split line width and the voltage difference of the two power supplies are generally recommended: the width of the modulus; the number of divided width is 15 mils, the part can be smaller; divided line width It can also be flexible according to the space situation on the board, the greater the better, the better;
6) The PCB design enclosure segmentation isolation width is 2mm, and the part is adjusted, and the requirements are not less than 1 mm; other signals are remote from the casing, including signal lines, via, paved copper, etc.
7) PCB Design If the power / ground plane is split, pay attention to the adjacent signal layer signal lines do not sprocar segmentation, and avoid the span of high-speed signals on the splitted reference plane.
8) PCB design segmentation power via avoids isolation belt, isolating copper, can cause such power overhead without connection;
9) PCB Design the power supply of the simulation area, in order to reduce the impact of the power supply on the signal, it is generally not recommended for large-area boat-paving network copper, which is generally processed away in the signal layer, the power supply is copper or the trace is satisfied, and other areas Try to palate copper and hit the well;
10) PCB design high voltage power supply and low voltage power supply to partition, the larger the spacing, the better the high voltage interference, the low voltage power supply and signal;
11) PCB design common climbing avoidance spacing:
I. When the voltage is <24v, the="" surface="" layer="" cover="" welding,="" the="" spacing="" is="" ≥0.13mm;="" the="" surface="" is="" not="" covered="" with="" welding,="" the="" spacing="" ≥0.64mm="" ii.24v="" ≤="" voltage=""><48v, primary="" side="" spacing="" ≥="" 0.5mm,="" secondary="" side="" spacing="" ≥="" 0.2mm;="" iii.48v="" ≤="" voltage=""><100v, spacing="" ≥1mm="" iv.100v="" ≤="" voltage=""><200v, spacing="" ≥1.5mm="" v.200v="" ≤="" voltage=""><400v, spacing="" ≥="" 2.5mm="" vi.400v="" ≤="" voltage=""><600v, spacing="" ≥="" 3.2mm="" vii.="" packed="" ≥="" 5mm="" when="" the="" voltage="" is="" ≥600v="" 12)="" the="" pcb="" design="" confirms="" the="" power="" supply,="" which="" can="" carry="" sufficient="" current.="" does="" the="" via="" number="" meet="" the="" bearing="" requirements="" (estimation="" method:="" 1a="" mm="" width="" when="" the="" outer="" copper="" thickness="" is="" 1oz,="" the="" inner="" layer="" 0.5a="" mm="" line="" width)="" 13)="" the="" pcb="" is="" designed="" to="" reduce="" the="" edge="" radiation="" effect="" of="" the="" plane,="" and="" the="" power="" layer="" and="" the="" formation="" should="" be="" as="" best="" as="" possible.="" (if="" the="" condition="" is="" allowed,="" the="" more="" the="" power="" supply="" layer="" is="" indented,="" the="" better="" it="" is.="" "20h="" principle"="" means="" that="" it="" is="" necessary="" to="" ensure="" that="" the="" power="" plane="" edge="" is="" 20="" times="" that="" is="" equivalent="" to="" the="" distance="" between="" the="" two="" planes,="" wherein="" h="" is="" the="" distance="" between="" the="" power="" supply="" plane="" and="" the="" plane="" of="" the="" power="" supply="" plane,="" as="" follows="" picture.="" why="" do="" i="" need="" 20h="" principles?="" in="" high="" speed="" pcb,="" usually="" the="" power="" supply="" plane="" and="" the="" horizontal="" inter-plane="" inter-plane="" inter-plane="" inter-web="" inter-web="" inter-ground="" inter-ground="" inter-ground="" inter-apex="" is="" to="" become="" edge="" magnetic="" leakage,="" and="" rf="" energy="" (rf="" current)="" radiates="" along="" the="" edge="" of="" the="" pcb,="" in="" order="" to="" reduce="" this="" coupling="" effect,="" all="" power="" plane="" physics="" the="" size="" is="" more="" than="" 20h="" than="" the="" nearest="" neighbor.="" 14)="" pcb="" design="" if="" there="" is="" a="" segmentation,="" check="" whether="" the="" partition="" does="" not="" constitute="" a="" loop?="" 15)="" does="" the="" pcb="" design="" different="" power="" planes="" different="" from="" the="" adjacent="" layers="" avoid="" overlapping?="" 16)="" pcb="" design="" protection,="" is="" the="" isolation="" of="" gnd="" greater="" than="" 4mm?="" 17)="" the="" pcb="" design="" is="" close="" to="" whether="" or="" not="" the="" connector="" panel="" is="" protected="" from="" 10="" to="" 20="" mm,="" and="" connect="" each="" layer="" with="" a="" double-oriented="" improver="" hole?="" 18)="" pcb="" design="" power="" way="" effective="" width="" check:="" whether="" the="" positive="" and="" negative="" piece="" copper="" is="" interrupted="" (bga,="" hypertherral="" intensive,="" and="" there="" is="" a="" high-speed="" bus="" in="" the="" via="" intensity),="" you="" need="" to="" focus="" on="" 0.8mmbga.="" read="" more="">
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