June 2003
Intermediate to advanced
432 pages
8h 47m
English
Content preview from Signal Integrity Issues and Printed Circuit Board Design
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Chapter 7. Impedance and Phase Shift
Impedance
Most people find that analyses regarding resistance are fairly easy. Analyses-regarding capacitive reactance aren’t too difficult, because capacitive effects seem to be somewhat intuitive to a lot of people. The effects of inductors are much less intuitive, and people tend to have more problems with them. And then there is impedance.
Table 7-1. Summary of the Effects of the Primary Passive Components
Component | “Impedance” to Current | Measured in | Voltage Phase | Frequency Dependent? | Impedance Is High if |
|---|---|---|---|---|---|
R | Resistive (R) | ohms | 0 | No | R ⇒ high |
L | Inductive reactance (X) | ohms | +90 | Yes | L ⇒ high f ⇒ low |
C | Capacitive reactance (X) | ohms | –90 | Yes | C ⇒ low f ⇒ high |
Consider the simple RC circuit shown in Figure 7-1, driven by an AC constant current ...
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