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(1) Analog circuit
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r: Signal Source Impedance
Rin: Input Adjustment Resistance
Zo: Characteristic Impedance of Internal
Elements (=Output Impedance)
Ro:Internal Adjustment Resistance (=Zo)
2(r+Rin)=Zo=R
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(2) PECL
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(3) LVPECL
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(4) TTL/CMOS
Ro should be adjusted to a value near Zo.
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