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I have a problem with a low noise amplifier because I can't find in ADS(Advance design system) software how to integrating under the are of a measured curve in a specific frequency range.Can someone help me how I can achieve that?

Figure 1 shows a paper result and how the noise measured and Figure 2,3 shows my results.As we can see the measured values for the noise is approximately the same but I would like to integrate under the are of a measured curve from 10Hz to 98kHz to find the total input referred noise and I don't know how I can do it.Also, I had searched a lot on the internet and I didn't find something useful.Can someone help me?

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Per your final table, 1Hz has 7.48e-5 noise voltage. And 1MHz has 6.55e-11. A fine V = 1/F curve. This is not Power = 1/Frequency, the expected 1/F behavior.

Given V = 1/F, this is the power of an integrator circuit.

To combine the noise power, square the noise density and integrate. You'll find the highest octave sets the noise density.

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  • \$\begingroup\$ I can't @analogsystemsrf understand your thougths. Can you give me a better explanation? \$\endgroup\$
    – vl123
    Commented Sep 18, 2017 at 10:02

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