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Controlled Impedance Stackups

Controlled Impedance Stackups
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Controlled Impedance Stackups

 

Summary :
Advancements in technology have driven PCB Designers & Engineers to seek improvements in system development & develop strategies to overcome signal communication issues. To this end, it has become increasingly evident that a solid & sound PCB design can greatly mitigate such issues and ultimately lead to better signal integrity. Those who are new to designing with controlled-impedance or are planning on engineering such solutions can find literature available online & in printed textbooks dealing in this specific subject. Per the studies done in this area, trace impedance is primarily governed by the board stackup, dielectric constant of materials, and the dimensions of the PCB trace itself.
Advancements in technology have driven PCB Designers & Engineers to seek improvements in system development & develop strategies to overcome signal communication issues. To this end, it has become increasingly evident that a solid & sound PCB design can greatly mitigate such issues and ultimately lead to better signal integrity. Those who are new to designing with controlled-impedance or are planning on engineering such solutions can find literature available online & in printed textbooks dealing in this specific subject. Per the studies done in this area, trace impedance is primarily governed by the board stackup, dielectric constant of materials, and the dimensions of the PCB trace itself.

If your design requires specific impedance properties, for example a differential impedance of 90 ohms, & you need to design the PCB which can meet this criteria, then youll need to investigate & calculate the best trace-width, trace-space, layer-to-layer spacing, as well as which PCB materials should be used. Keep in mind that there are certain tolerances encountered at each stage during PCB fabrication: the trace etching tolerances, the material thickness tolerances, as well as the copper finish tolerances. In order to keep the impedance to say +/- 10% of the ideal value, it is important to let your PCB fabricator have an input in this matter & suggest stackups based on what they have in-stock and their specific capability levels.

Were taking this opportunity to announce that Electronic Interconnect has begun providing an Engineering Service in designing a multilayered controlled-impedance stackup to fit your design targets. You can either consult us before starting the design or if youve already finished the PCB Layout, then we can take the information from your Gerber data & design a stackup to meet the desired impedance goals. Our extensive PCB fabrication knowledge coupled with the awareness of our shops tolerances helps us deliver stackup solutions which can best fit your controlled-impedance designs.To learn more, please contact us at engineering@eiconnect.com!
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