source:Industry News release time:2022-07-14 Article author:yu Popular:pcb
Spread the white paper on the circuit surface of the PTFE board, and clamp the top and bottom with a 1.0MM-thick FR-4 substrate board or a phenolic bottom plate with a thickness of 1.0MM to remove copper.
How to choose PCB Rogers high frequency board
The selection of PCB circuit board materials must strike a balance between meeting design requirements, mass production, and cost. Simply put, design requirements include both electrical and structural reliability. Usually when designing very high-speed PCB boards (frequency greater than GHz) this board problem is more important.
1. Cost factor
Depending on the price sensitivity of the product, whether it is a consumer product or an application in communications, medical, industrial, and military industries;
2. Manufacturability
For example, how is the performance of multiple pressing, temperature performance, etc., CAF/heat resistance and mechanical toughness (stickiness) (good reliability), fire rating;
3. Timely availability of materials
The procurement cycle of many high-frequency boards is very long, even 2-3 months; except for the conventional high-frequency board RO4350, which is in stock, many PCB high-frequency boards need to be provided by customers. Therefore, PCB Rogers high-frequency board needs to communicate with the manufacturer in advance and prepare materials as soon as possible;
4. Various properties that match the product
Low loss, stable Dk/Df parameters, low dispersion, small coefficient of variation with frequency and environment, small tolerance of material thickness and glue content (good impedance control), if the trace is long, consider low-roughness copper foil. Another point is that the design of high-speed circuits requires simulation in the early stage, and the simulation results are the reference standard for design.
5. Applicability of laws and regulations, etc.
It must be integrated with the environmental protection regulations of different countries and meet the requirements of RoHS and halogen-free.
Among the above factors, the running speed of high-speed digital circuits is the main factor for PCB selection. The higher the speed of the circuit, the smaller the selected PCBDf value should be. Boards with medium and low loss will be suitable for 10Gb/s digital circuits; boards with lower loss will be suitable for 25Gb/s digital circuits; boards with ultra-low loss will be suitable for faster high-speed digital circuits, whose rate can be 50Gb/s or higher.
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