Noise Figure of LNA with an input tone (using hb/hbnoise)

Hi all,

First of all, I am using version MMSIM 13.11.176 and Cadence IC6.1.6-64b.500.14.

I have the following question:

I want to simulate the Noise Figure of an LNA by applying an RF tone (frf=1.575GHz) at input and running hb/hbnoise analyses (the power of rf tone is kept small i.e. Pin=-50dBm to get similar results as having a small signal analysis, like SP simulation). So, I am setting up hb+hbnoise as shown in the figures1 &2 .

The problem is that when I plot the noise figure from hbnoise results I get an extremely high peak at exactly the frequency where the RF tone is. 

(Note that left and right of  the peak, the noise figure is exactly the same as what I get from the SP simulation.)

Is it something that I am doing wrong in the setup of hb/hbnoise and/or measurement ?

Regards