Quick Turn impedance control PCB manufacturing

Impedance Control PCB

Many customers asked us what information we need for impedence control PCB.Here,there are two types for PCB manufacturer,a is single impedance ,just one trace ,two holes .and b is differential impedance,it always go with 1 pair (two trace with same width and space). For single impedance,you just tell us the trace width one which layer and what value you require .For differential impedance,trace width/space,layers and value. Our experience engineers will calculate following your instruction with Polar software.We may change trace width/space or stackup ,but please do not worry, if any changes,we will send you to approve before proceeding. Generally,the tolerance is 10%,and more accurate is 8% .All impedance boards ,we will test here and report.

Here is an example of what information we need to do impedance control.

TYPE	VALUE	Layer	width/space
Single	50 ohm +/-10%	L1,L6	0.15mm
Single	50 ohm +/-10%	L2,L3,L4,L5	0.13mm
Differential	90 ohm +/-10%	L1,L6	0.13/0.13mm
Differential	100 ohm +/-10%	L1,l6	0.13mm/0.2mm

As a PCB manufacturer,we made a lot of impedance PCBs.Here are some of our suggestions for impedance calculation.The most important is the Er,H,W and T. Er is material dielectric constant.H is the dielectric thickness.W is trace width.and T is trace thickness.The following are the calcluation models and stackups we often use.

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10 Layer HDI board,0.5mm pitch BGA. 4/4mil,0.15mm vias,Tablet PC mother board,Impedance control