source:Other information release time:2023-08-04 Hits: Popular:PCB Assembly company
1. The impact of solder mask thickness on impedance is relatively small, with an increase of 10um in solder mask thickness and a change in impedance value of only 1-2 ohms.
2. When designing, there is a significant difference between using cover resistance welding and non cover resistance welding, with a single end of 2-3 ohms and a difference of 8-10 ohms.
3. In the production of impedance boards, the resistance welding thickness is controlled normally according to production requirements.https://www.bropool.com/sauna_room/
Impedance testing
The basic method is the TDR method (Time Domain Reflection Method). The basic principle is that the instrument emits a pulse signal, which is folded back through the test piece of the circuit board. The changes in the emission and folding characteristic impedance values are measured, and after computer analysis, the characteristic impedance is output.
Handling impedance issues
1. For the control parameters of impedance, the control requirements can be achieved through mutual adjustment in production.
2. After lamination in production, slice and analyze the board. If the thickness of the medium decreases, the line width can be reduced to meet the requirements; If it is too thick, the copper can be thickened to reduce the impedance value.
3. In testing, if there is a significant difference between theory and practice, it is likely that there is a problem with the engineering design and test strip design.
Read recommendations:
Green Solder Mask FR4 Single Sided PCB Board 0.4mm Halogen Free
HASL FR4 Single Sided Copper PCB Board White Solder Mask 35um Thickness
Welcome information, we will answer for you quickly
No. 1 Jingtian Road, Xinsheng community, Longgang District, Shenzhen, Guangdong, China
+86 13715096176
Whatsapp/WeChat : +86 13715096176
Kevin.kuang@xzgcircuits.com
Return
