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How is the phase error measured in a DDR application?

April 26, 2017application DDR Error measured phase

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How is the phase error measured in a DDR application?

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The phase error is measured from the crosspoint of the input reference signals to the crosspoint of the output signals. For example, Pericom PI6CV857 clock driver phase error is measured from CK and CK/ input pins to FBIN and FBIN/ pins. Therefore, all 4 probes of a typical oscilloscope are used.