Hello,
For the routing of DDR3 memory chips and FPGA, I need 40 Ohms impedance for single tracks, and 80 Ohms for differential pairs.
I think i can get these values in external layers (top and bottom), using a 1080 prepreg (70 micrometers and Er=4,4).
I mean, for top layer, i have the following configuration
1.- 35um copper foil
2.- 65um(real) 1080 prepreg
3.- GND plane as reference
The problem, is about the manufacturer of the PCB. They do not recommend me to use that prepreg because it gives them a lot of problems.
This PCB manufacturer doesn't recommend to use a 75 micrometers (dielectric) core either.
My question is what do you think about it? Is 1080 prepreg a very rare dielectric ? Must i choose other PCB manufacturer ?
Thanks a lot in advance
For the routing of DDR3 memory chips and FPGA, I need 40 Ohms impedance for single tracks, and 80 Ohms for differential pairs.
I think i can get these values in external layers (top and bottom), using a 1080 prepreg (70 micrometers and Er=4,4).
I mean, for top layer, i have the following configuration
1.- 35um copper foil
2.- 65um(real) 1080 prepreg
3.- GND plane as reference
The problem, is about the manufacturer of the PCB. They do not recommend me to use that prepreg because it gives them a lot of problems.
This PCB manufacturer doesn't recommend to use a 75 micrometers (dielectric) core either.
My question is what do you think about it? Is 1080 prepreg a very rare dielectric ? Must i choose other PCB manufacturer ?
Thanks a lot in advance
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