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OPA1622: Current Sharing Question

Part Number: OPA1622

Hello,

I am using two OPA1622 in parallel to increase current drive, you can see my circuit below.

I am seeing strange behavior when looking at the FFT of the output of the device (X4).

The noise floor keeps going up by 10dB and then back down by 10dB can this be attributed to the the two amps switching back and forth between each other?