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PCB阻抗计算方法 免费

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PCB阻抗控制PCB Impedance Control:
Formulas and Resources
Douglas Brooks, President UltraCAD Design, Inc.
Many of the formulas we use for PCB impedance calculations are readily available, but not all of them. In fact, while we are often quick to say that PCBs begin to look like transmission lines when rise times are fast enough, and perhaps toss out a few formulas for our readers, we miss at least three factors when we do so. Not complete: It's not enough to say that Zo equals some complex formula. We may also want to know other parameters, such as propagation time, intrinsic capacitance, intrinsic inductance, and the effects of device loading and terminations. I know of no single source where all of these formulas are made available. Too complex: Even if the formulas are available, they can be so com
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PCB阻抗计算方法 免费
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