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you know the transmission line has some inductunce, capacitance, conductance and resistance.
we know voltage lead in Inductor and Current Leads in Capacitor. now if we measure the ratio between the Voltage and current at a point. this is the characteristic impedance to that point.
In general Life you have noticed that when a person has harsh attitude so you keep compromise with him. the impedence has the same case. you mmust compromise over the next circuitry.
Impedance is the one of the most important characteristics of PCB layout design. If your impedance is not controlled, the output characteristics of the signal will not be the same as you expect. For high speed design, impedance is the major concern.
When you doing a Split planning, you need to avoid the traces crosed between two planes. In this, the impedance of the trace is mismatched in the anti-etch area. So you can't get the desired output.
I think the most improtant reason is that there are errors between your design and the chip taped out. And the error is due to the process you used.
So R or Cap will be not equal to the one your designed
BOOK - Physics For Scientists And Engineers 6E By Serway And Jewett
page 1043 (book comes in 2 parts, this one is part two)
CHAPTER 33 • Alternating Current Circuits
33.5 The RLC Series Circuit
Impedance is described there very well (with formulas, graphics and so on...)
maybe you'll be able to find the book with solution manual on ebookee.com
if not - PM me and we'll work out something
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