Could you explain me how to calculate the noise figure for the scheme using Diff-Amp calculator's results?
The source resistance is 50 OHm.
Thank you for pointing that out. I have overlooked a certain formula and parameter. Anyway, it has been corrected in the attached file.
Are you trying to compute for each components noise contribution or other figure of merit? Please do let me know. Anyway, see attached file for the computation for values of noise contributions in the DiffAmpCalc.
By the way, what is your intended application?
I want to optimize a system noise factor of a direct conversion receiver. The ADA4930 is used as low noise amplifier following a quadrature converter. To calculate the overall noise figure I need to know the amplifier stage. I tried to calculate as showed on the picture but I'm not sure it is correct because NF depends on a load resistance.
Noise figure is usually not used with op amps. See:
Thank you for the useful reference.
Using the information I have calculated ADA4930's noise figure (see the attachment).
I've found some differences in the voltage noise computation between your Excel file and the Diff-Amp calculator. Could you comment it?
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