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JFE150: Noise density versus drain-source current

Part Number: JFE150


Tool/software:

Hi team,

Figure 6-11 Input-Referred Noise Spectral Density vs Drain-to-Source Current
In Figure 6-11, why does the input-referred noise get worse when the drain-to-source current is 7mA or higher?
I was under the impression that the more current is applied, the better the noise becomes, but I would like to know what factors cause the noise to worsen.

Best Regards,
Ryu.