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LPF_Bessel with transient noise simulation

Question asked by wb5mrn001 on Nov 9, 2014
The LPF_Bessel cell gives 1million times or 1billion times higher noise output in transient simulations if selecting Fpass of 17.5e9 compared to selecting Fpass of 17.6e9.  The error depends on the value of the Noise Bandwidth option in the transient simulation.  Is there a way to resolve this such that noise spectral density is correct for a wide range of Fpass values?

Example test circuit attached along with results.   Note the kV units on the y axis.  Changing Fpass from 17.5e9 to 17.6e9 and re-running results in y axis units of uV.