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Factors influencing a high frequency PCB Design
Some of the factors needed to design high frequency PCB are mentioned below:
The selection of PCB material for high-speed digital circuits is influenced by several factors. The high frequency PCB must offer following features apart from a good structural build-up. Impedance controlled multilayers
Sandwich buildup for material combinations
Controlled production line
Signal loss tolerance
Heat sinking ability
Operating temperature(temperature expansion, stability over a temperature range)
Production cost
| Article | Description | Capability |
| Material | Laminate materials | FR4, High TG FR4, High Frequency, Alum, FPC... |
| Board Cutting | Number of layers | 1-48 |
Min.thickness for inner layers
(Cu thickness are excluded) | 0.003”(0.07mm) |
| Board Thickness | Standard | (0.1-4mm±10%) |
| Min. | Single/Double:0.008±0.004” |
| 4layer:0.01±0.008” |
| 8layer:0.01±0.008” |
| Bow and twist | no more than 7/1000 |
| Copper Weight | Outer Cu weight | 0.5-4 0z |
| Inner Cu weight | 0.5-3 0z |
| Drilling | Min size | 0.0078”(0.2mm) |
| Drill deviation | ±0.002″(0.05mm) |
| PTH hole tolerance | ±0.002″(0.005mm) |
| NPTH hole tolerance | ±0.002″(0.005mm) |
| Solder Mask | Color | Green,white,black,red,blue… |
| Min solder mask clearanace | 0.003″(0.07mm) |
| Thickness | (0.012*0.017mm) |
| Silkscreen | Color | white,black,yellow,blue… |
| Min size | 0.006″(0.15mm) |
| Max Size of Finish Board | 700*460mm |
| Surface Finish | HASL,ENIG,immersion silver,immersion tin,OSP… |
| PCB Outline | Square,circle,irregular(with jigs) |
| Package | QFN,BGA,SSOP,PLCC,LGA |
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Delivery Time for PCB
| Layer | Prototype | Mass Productions (above 30 m2 ) |
| Quick Turn | Unual Time |
| 2 | 24 hours | 3-4 days | 8-10 days |
| 4 | 48 hours | 5-6 days | 10-12 days |
| 6 | 72 hours | 6-8 days | 12-14 days |
| 8 | 96 hours | 8-10 days | 14-16 days |
| 10 | 120 hours | 12-14 days | 16-18 days |
| ... | ... | ... | ... |
Delivery Time for PCBA
| Order Conditions | Standard Delivery Date | The fastest Delivery Date |
| Prototype (<20 pcs) | 2 days | 8 hours |
| Small Volum (20-100 pcs) | 3 days | 12 hours |
| Medium Volum(100-1000 pcs) | 6 days | 24 hours |
| Mass productions (>1000 pcs) | Depends on BOM | Depends on BOM |
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