Example of Impedance control in Polar SI9000 The text discusses how the impedance of a microstrip in PCB design is influenced by several parameters, including the dielectric height (H), dielectric constant (Er), trace thickness (T), and trace widths (W, W1). Adjustments to these parameters can significantly impact the impedance, which needs to be precisely calculated, especially at higher frequencies. Achieving the correct impedance is challenging due to the tolerances in these parameters. The example provided explains that for a 50-ohm target impedance, a specific trace width is required, and the manufacturer must ensure accuracy in the PCB process to meet the required impedance.
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