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Impedance Controlled PCB

The impedance of a PCB trace is controlled by

  • its configuration
  • dimensions (trace width and thickness and height of the board material)
  • dielectric constant of the board material.

We can meet your requirement concerning all these parameters.

    Impedance Design and Verification :

  • Printouts of Impedance Measurements;
  • Impedance Coupons to Each Board;
  • Impedance Measurements of Specific Traces;
  • Characteristics and Differential Impedance.

Finished Impedance Tolerance:
Regular : +/- 10%;
Special :+/- 5%

Etch Factors  per side (mkm)

 

 Cu Weights 
          (oz )

   Internal 
      (+/-)

   External
      (+/-)

1/4

       0.25

       1.30

1/2

       1.30

     2.54

1

     25.00

     50.00

2

     50.00

     75.00

3

     75.00

   100.00

4

   100.00

   125.00

You can find an additional information about impedance calculation here (.xls 126Kb), and especial about differencial impedance calculation here (.pdf 17Kb for more information see ref.4).

References

1. IPC-D-317A, "Design Guidelines for Electronic Packaging Utilizing High-Speed Techniques," IPC, Chicago, 1995.

2. IPC-2141, "Controlled Impedance Circuit Boards & High Speed Logic Design," IPC, Chicago, 1996.

3. IEC 61188-1-2, "Printed Boards and Printed Board Assemblies—Design and Use. Part 1-2: Generic Requirements—Controlled Impedance , " International Electrotechnical Commission, Geneva, 1998.

4. Douglas Brooks Columns, Articles, and Papers: www.ultracad.com/articles.htm

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