Instead of using an online PCB impedance calculator to determine the impedance of each trace in your PCB, Altium Designer incorporates PCB impedance calculations as part of your stackup design process. While you can work out many of these details by hand or with a circuit design program to model impedance in your board, the best PCB design tools give you more sophisticated ways to design for controlled impedance. Impedance in your traces becomes a critical parameter to consider during stackup design for high-speed PCBs, but the stackup will also influence crosstalk susceptibility and sheet capacitance between ground and power planes. High-speed designs carry a requirement for controlled impedance, crosstalk control, and the need for interplane capacitance. There are many demands placed on PCB stackup design.
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