understanding of frequency folding in Cadence pnoise set-up

Hello, there

I went through previous discussions and try to confirm my understanding regarding pnoise simulation set-up is correct.

Let’s take an example:

VCO output freq = 1G Hz

Sweep Start= 200; Stop=0.5G Hz (half of fundamental freq)

Relharmum=1: it means that frequency range from 1.0000002G Hz to 1.5G Hz is output noise frequeny of interest.

The noise from 1.0000002 to 1.5 GHz will be directly added to output noise spectrum without conversion effect.

The noise from 200 to 0.5G Hz will be upconverted to 1.0000002 to 1.5 GHz by 1^st harmonic.

How about the noise from 0.5G Hz to 1 GHz?

If by 1^st harmonic: It will be converted into from 1.5G to 2GHz and from -0.5G to 0 Hz. It means that noise from 0.5G to 1GHz won’t contribute to the output noise. It seems like it is not quite right. Please help me to clarify. Thanks!

Best