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Hello,
According to our PCB manufacturer's calculation, the trace width will be above 0.2 mm in order to keep 40 Ohm single ended impedance.
I found that it was impossible to fan out this trace from BGA (0.8mm pitch). I have to make it thinner, thus I can't keep required impedance under BGA. I did some research online, someone said it shouldn't be an issue with such a short distance of trace without impedance control. I am not sure if this kind of impedance mis-matching will cause any reflection big enough to affect signal quality.
I am wondering how you guys deal with this kind of situation in your design?
Thank you!
According to our PCB manufacturer's calculation, the trace width will be above 0.2 mm in order to keep 40 Ohm single ended impedance.
I found that it was impossible to fan out this trace from BGA (0.8mm pitch). I have to make it thinner, thus I can't keep required impedance under BGA. I did some research online, someone said it shouldn't be an issue with such a short distance of trace without impedance control. I am not sure if this kind of impedance mis-matching will cause any reflection big enough to affect signal quality.
I am wondering how you guys deal with this kind of situation in your design?
Thank you!
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