Impedance control in PCB In PCB manufacturing, various patterns like copper, hole, and ink patterns must be combined within specific tolerances. Impedance control is a critical factor in high-precision designs, and it involves managing the trace width, height, and dielectric thickness to maintain the desired impedance. There are three levels of impedance control: no control, where the design naturally meets the impedance requirements; impedance watching, where the manufacturer adjusts specifications based on designer input and may perform TDR testing; and strict impedance control, used for high-end designs requiring precise impedance values, often involving iterative manufacturing and testing to achieve the target impedance.
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