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PCB Impedance Control:Formulas
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2010-01-15
qiansiliang
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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.
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.
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