There is a button for "Include FM noise (osc. only)" in Noise(1) tab of HB controller.

But we can always get both "pnmx" and "pnfm" as phase noise result

regardless of setting this "Include FM noise". On the other hand, there is no such button in NoiseCon.

So my question is:

"FM_Noise=yes" has any meaning as option of HB analysis statement ?

Before MDS7.0, this "FM_Noise=yes" had surely meaning,

since we couldn't get "pnmx" and "pnfm" separately.

But after MDS7.1 including current ADS, we can get "pnmx" and "pnfm" separately.

Of course, we can get relative vnoise spectrum(NC2.Vout.noise) as phase noise result,

but SSB_phase_noise calculated by this relative vnoise spectrum(NC2.Vout.noise) is same as "pnmx" regardless of "FM_Noise=yes or no".

MDS70_SSB_phase_noise=vs(dB(NC2.Vout.noise)-dB(HB.Vout[1]/sqrt(2)), abs(NC2.noisefreq))

"FM_Noise=yes or no" is a vestiges from legacy and inappropriate interpretation of phase noise ?

But we can always get both "pnmx" and "pnfm" as phase noise result

regardless of setting this "Include FM noise". On the other hand, there is no such button in NoiseCon.

So my question is:

"FM_Noise=yes" has any meaning as option of HB analysis statement ?

Before MDS7.0, this "FM_Noise=yes" had surely meaning,

since we couldn't get "pnmx" and "pnfm" separately.

But after MDS7.1 including current ADS, we can get "pnmx" and "pnfm" separately.

Of course, we can get relative vnoise spectrum(NC2.Vout.noise) as phase noise result,

but SSB_phase_noise calculated by this relative vnoise spectrum(NC2.Vout.noise) is same as "pnmx" regardless of "FM_Noise=yes or no".

MDS70_SSB_phase_noise=vs(dB(NC2.Vout.noise)-dB(HB.Vout[1]/sqrt(2)), abs(NC2.noisefreq))

"FM_Noise=yes or no" is a vestiges from legacy and inappropriate interpretation of phase noise ?

For harmonic balance analysis, the FM_Noise parameter is superfluous. If an oscillator analysis is being done and phase noise is requested, the FM noise analysis is always performed in addition to the mixing noise analysis. The NoiseCon has already eliminated this.

We should remove the FM_Noise parameter from the HB

controller, and update the HB dialog box and documentation.

I have submitted a request to have the FM_Noise flag eliminated from the HB controller (ref. ATM Simulation.9069)