Hi,
First of all I'll apologize for my newbish question
I've always wondered why do we have the option "Impedance control" in some PCBs manufactures when quote a PCB.
If I have the specific PCB stack-up from the manufacture and according to these data I calculate and gets the width of the signal to achieve the required impedance, considered the manufacture capabilities. so if I get it right, the manufacture will manufacture the PCB with the width that I did in the design according to the DFM files that I supplied in my order.
So, Why do I need this option "Impedance control"? What else the manufacture do?
Thanks.
First of all I'll apologize for my newbish question

I've always wondered why do we have the option "Impedance control" in some PCBs manufactures when quote a PCB.
If I have the specific PCB stack-up from the manufacture and according to these data I calculate and gets the width of the signal to achieve the required impedance, considered the manufacture capabilities. so if I get it right, the manufacture will manufacture the PCB with the width that I did in the design according to the DFM files that I supplied in my order.
So, Why do I need this option "Impedance control"? What else the manufacture do?
Thanks.
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