AZ,上次问过PCB问题,追问一下:
根据TI的CC2541+CC2590的板子,馈线的线宽是13mil(0.3302mm),覆铜距离差不多是40mil(1.016mm),这样用APPCAD算出来的阻抗不是50欧姆啊,差距也太大了,这是为什么?因为四层板和两层板不一样的原因吗?我准备画两层板
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你H错了。这个是和参考地平面的距离。不是1。。。。。
下面是zip里面的read me 文件。
PCB DESCRIPTION:4 LAYER PCB 1.6 MM
Copper 1 35 um
Dielectric 1-2 0.175 mm (e.g. 1x Prepreg 7628 AT05 47% Resin)
Copper 2 18 um
Dielectric 2-3 1.14 mm (6x 7628M 43% Resin)
Copper 3 18 um
Dielectric 3-4 0.175 mm (e.g. 1x Prepreg 7628 AT05 47% Resin)
Copper 4 35 um
DE104iML or equivalent substrate (Resin contents around 45%, which gives Er=4.42@2.4GHz, TanD=0.016)
Dimensions in mil (0.001 inch)
DOUBLE SIDE SOLDER MASK,
DOUBLE SIDE SILKSCREEN,
8 MIL MIN TRACE WIDTH AND 5 MIL MIN ISOLATION.
Cadstar.
you can download a free viewer.
https://www.zuken.com/en/products/pcb-design/cadstar/resources/software/designviewer
or, 如果你的工具自持的话,你也可以导入。。。
BR. AZ