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OPA847: Noise figure for op amps

Expert 1545 points
Part Number: OPA847

Hello 

I want to use OPA847 as a gain block for a receiver between 50 to 500KHz.

I am using Keysight ADS with the workspace found on TI website, and simulating the noise figure using the spice model with ADS S parameter solver. How accurate are the results? Does anyone has a spreadsheet for calculation of noise figure from op amp noise parameters? 

Thanks