It is all about efficiency. Theory shows that maximum signal transfer happens when all impedances along the signal path are matched.
In all circuits which operate under high frequencies and process high speed digital signals, it is important to control impedance.
Impedance control is fast becoming a standard requirement for PCB manufacture and is has become critical in areas such as:
Telecommunications
RF applications
High speed digital applications
Impedance controlled circuits can be found in the electronics you use every day: your mobile phone, TV, computer, printer and even your car!
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