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AD8479 output have ripple wave?

Question asked by Liusensen on Nov 1, 2017
Latest reply on Nov 2, 2017 by Liusensen

The circuit is like this:

The  Rshunt of AD8479 is 100K,when I don't apply direct voltage to the resistor,supply electricity to AD8479, decoupled AD8479 well with two 0.1uF capicators,

the output signal is like this:

and when I apply direct voltage(22.6V) to the resistor,and AD8479 is powered on, the output signal is like this:

it seems the output voltage is a direct voltage plus a ripple voltage,but the direct voltage is what it should only has, what causes this problem?

Thank you for any suggestions from you!