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Measurement circuit (Voltage Noise Density 2.9nV on 1Khz) of LMP7731

Other Parts Discussed in Thread: LMP7731

I want to know a measurement circuit at the 1khz of Voltage Noise Density.

for 2.9nV/rtHz (f=1Khz)

Because I cannot measure 1Khz by a measurement circuit of figure 2

Thanks