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What is Controlled Impedance(什么是阻抗控制)
Controlled Impedance: Why do I need to know more?
20-April-2008
Controlled Impedance: Why do I need to know more?
The Basics:
Electrical Impedance: a measure of opposition to time-varying electric current
in an electric circuit.
Simplified: To slow down an electrical circuit.
Why: As PCB designs and components become more complicated, smaller
and faster, it becomes necessary to slow certain circuits down,
allowing specific functions of components to perform before others.
The increase in processor clock speed and component switching
speed on modern PCB’s means that the interconnecting paths (traces)
can no longer be regarded as simple conductors.
Every circuit on a PCB has impedance. The goal is to control the impedance.
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