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Waveform input circuit, waveform observation unit and semiconductor test apparatus

  • US 20070268012A1
  • Filed: 03/03/2006
  • Published: 11/22/2007
  • Est. Priority Date: 03/04/2005
  • Status: Active Grant
First Claim
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1. A waveform input circuit to which a signal from a device under test is input via an input signal transmission line, the waveform input circuit comprising:

  • a high input impedance terminating resistance which receives the signal from the input signal transmission line as an input signal;

    selection means for selecting one of two or more terminating resistances including the high input impedance terminating resistance;

    an input buffer which is connected when the high input impedance terminating resistance is selected in the selection means; and

    switch means for switching a reference potential of the input signal transmission line to at least two kinds of different potentials, wherein one reference potential which is switched by the switch means is “

    a potential controlled to be in phase with the input signal by an output voltage of the input buffer which is connected when the high input impedance terminating resistance is selected in the selection means”

    .

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