PRE-EMPHASIS AUTOMATIC ADJUSTMENT SYSTEM, ADJUSTMENT METHOD THEREOF, AND EMPHASIS SETTING SIGNAL GENERATING CIRCUIT

PROBLEM TO BE SOLVED: To attain optimal emphasis imparting or the like to attenuation at a through-hole. SOLUTION: The present invention relates to a pre-emphasis automatic adjustment system and in a state where termination of a receiving circuit 16 is canceled, a step signal is transmitted from a t...

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1. Verfasser: TANABE MOTOI
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To attain optimal emphasis imparting or the like to attenuation at a through-hole. SOLUTION: The present invention relates to a pre-emphasis automatic adjustment system and in a state where termination of a receiving circuit 16 is canceled, a step signal is transmitted from a transmission circuit 12 through a signal transmission line 14 to the receiving circuit 16. The signal level of a reflection signal thereof is compared with a first reference voltage Vref1 of a first reference voltage source 18d. On the basis of a comparison result that the signal level of the reflection signal is included within a capacitive reflection zone lower than the first reference voltage Vref1, a zone detection signal within the capacitive reflection zone is outputted from a reflection wave detecting circuit 18e. COPYRIGHT: (C)2009,JPO&INPIT