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I am confused about the output noise current graph in the LM13700 data sheet (page 6), and this sort of graph in general.
http://www.media.mit.edu/resenv/classes/MAS836/ToPost/LM13700.pdf
For example, it says that for a bias current of 1mA, the noise output noise current is 200pA per ^/Hz at 1kHz. Can someone explain what this means?
For example, to get the RMS noise across some bandwidth I need to multiply the amps-per-root-hertz by the square root of the bandwidth, right? So for a 20kHz bandwidth I would get 200pA*141 = 28nA RMS noise current.
But the graph is a curve, so I would get a completely different figure if I chose a different frequency from the graph, so how should I be using these figures?
http://www.media.mit.edu/resenv/classes/MAS836/ToPost/LM13700.pdf
For example, it says that for a bias current of 1mA, the noise output noise current is 200pA per ^/Hz at 1kHz. Can someone explain what this means?
For example, to get the RMS noise across some bandwidth I need to multiply the amps-per-root-hertz by the square root of the bandwidth, right? So for a 20kHz bandwidth I would get 200pA*141 = 28nA RMS noise current.
But the graph is a curve, so I would get a completely different figure if I chose a different frequency from the graph, so how should I be using these figures?
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