about stability (kf,b1f) simulation for mixer

Dear All,

I would like to know whether we can use the sp or (psp or hbsp) to simulate the stability (kf, b1f) performance for a circuit like mixer (or Tx or Rx).

K factor (kf) and b1f are used to check the stability of a linear circuit, right? Does this mean that we can not use these parameters to check the stability of a mixer? If this is true, then how can we check the stability of the mixer or the whole Tx or Rx?

Thanks in advance.