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Spectre RF noise analysis

Northfork

I'm trying to simulate the thermal noise spectral density of a resistor in ic6.1.5-64b using the noise analysis in the ADE.
I am using the port component (50 ohm) along with a noiseless resistor (50 ohm).
I would expect the thermal noise spectral density to follow 4kTR, but I am getting something that is approximately 1/4th that when I simulate it.
Would expect 8.28e-19 V^2/Hz (@300K), but the plot shows 2.0019e-19 V^2/Hz.

Is there a reason for this, or is my setup incorrect?

Parents

  • I think I may understand what you are saying. Does this mean that if I take the output across the noiseless resistor for the noise analysis I will NOT get the variance of the noise source required to deliver the total noise power, RATHER I will obtain kTR/delta_f ( which is power density*R or Vout_rms^2/delta_f)? I guess I dont understand what the noise analysis is plotting. Maybe I'm just confused with the terminology.

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  • I think I may understand what you are saying. Does this mean that if I take the output across the noiseless resistor for the noise analysis I will NOT get the variance of the noise source required to deliver the total noise power, RATHER I will obtain kTR/delta_f ( which is power density*R or Vout_rms^2/delta_f)? I guess I dont understand what the noise analysis is plotting. Maybe I'm just confused with the terminology.

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