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JFE150: Noise density versus drain-source current

Ryu Yamashita
Genius 3985 points
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.

  • +1
    TI__Mastermind 26305 points

    Hi Ryu, 

    The temperature of the die goes up with higher IDS and therefore the thermal noise increases at the inflection point you are observing. Think of the drain to source channel as a resistor. As temperature rises the thermal noise of a resistor goes up with the Johnson-Nyquist theory.

    Best Regards, 
    Chris Featherstone