Why transistor NE3210S01 still oscillates when gate is biased almost -3v?

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Terminator3

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I can't understand why is this?
- both source pins directly grounded through two holes to back side of PCB, so there are no any additional inductance
- gate is biased -2.5v
 

Make sure you have a coil (filter) on the DC bias sources. These hidden signals could perturb you device.
 

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