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What is the difference between impedance control and impedance measurement?

What is the difference between impedance control and impedance measurement?

Impedance control is the first step and generally possible without any measurement. All you need to do is to select specific materials, define the stack-up, trace width and trace distances. After production you may measure the real trace distances, board-stack-up etc. and apply these values to your pre-calculation. Using software from polar instruments you will get a very good indication on what the real impedance on your PCB will look like. This is a way to "control" the impedance with simple tools.

However, this is still not a real and complete impedance measurement. We recommend to you to clarify with your supplier what "impedance control" really means. Are really impedances measured or is it simply a thorough planning and cross-calculation of the actual physical appearance?


What is the difference between impedance control and impedance measurement?

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