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electrical termination : ウィキペディア英語版
electrical termination

Electrical termination of a signal involves providing a terminator at the end of a wire or cable to prevent an RF signal from being reflected back from the end, causing interference. The terminator is placed at the end of a transmission line or daisy chain bus (such as in SCSI), designed to match AC impedance and hence minimize signal reflections.
== Types of terminators ==
;Passive
Passive terminators consist of a simple resistor. Limited usage for high-speed applications. There are two types: a resistor between signal and ground like in Ethernet, or a resistor from the positive rail to signal and a resistor from the signal to negative rail like in SCSI.
;Active
Active terminators consist of a voltage regulator that keeps the voltage used for the terminating resistor(s) at a constant level.
;Forced Perfect Termination (FPT)
Forced Perfect Termination can be used on single ended buses where diodes remove over and undershoot conditions. The signal is locked between two actively regulated voltage levels, which results in superior performance over a standard active terminator.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「electrical termination」の詳細全文を読む



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