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INA849: How should I do and which instrument I can choose, if I want to measure one amplifier's 'Current Noise' like INA849?

Nan Li
Intellectual 260 points
Part Number: INA849

Hi TI,

I want to measure the 'current noise' of amplifier, but I don't know which method I can use to do this.

By the way, which kind measurement instrument I can choose?

I want to get the noise figure like the above figure from INA849 data sheet, and get power spectrum density by FFT like below figure.

Best Regards,

Thanks

  • 0
    TI__Guru 64290 points

    Nan,

    The input current noise may be measured by converting it across the resistor  - see below.

    Figure 7-28 uses a scope to measure 1/f low frequency input current noise by converting it across the input resistor to voltage noise while Figure 7-25 uses a spectrum analyzer to measure input current noise spectral density as shown in the test circuit above.