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PCM1794A: The waveform after the I/V stage.

Part Number: PCM1794A

Dear professors,

       Thank you for reading the question, and thank you for help me to resolve the problems.

      The waveform after the I/V stage always  has "rise up" just like figure 1, and sometimes has "overshoot” just like figure 2 and 3.  I don't know wether the phenomenon is right or wrong, and why? 

Figure 1

Figure 2

Figure 3

Best regards,

Byron.