Mixer simulation problem using Spectre

Status
Not open for further replies.

wccheng

Full Member level 5 spectre mixer

Dear all,

I have tried to follow the tutorial notes of the mixer simulation provided by the Cadence. In the Noise Figure simulation output waveform, it is a SSB or DSB noise figure of the mixer?
Moreover, it is needed to set the Reference side-band for the noise figure simulation. Actually, what is it stand for? The tutorial just simply said "The Reference Sideband must be -1 because this is a down converter". Then 0 and +1 is stand for what?

Best Regards,

wccheng

Mazz mixer smilulation

By definition Noise figure calculations in Spectre are SSB. This is because Spectre simulates the output noise and he doesn't know whether it comes only from one sideband or from both, and then it divide it by gain to calculate NF. But gain (transfer function in the tab, if I well remember) is calculated with a CW only in one sideband.
If you want to see more, do a psp after the pss. In the psp tab you'll find NF, NFDSB, NFIEEE (calculated at 290k).
Regarding the sideband (-1,0 or 1), I remember that in the tutorial there is the equation to calculate results of sidebands. use it.
Bye
Mazz

• chrishit

chrishit

Points: 2

wccheng

Full Member level 5 mixer spectre

Dear Mazz,

I am very thankful for your explanation.

Best Regards,

wccheng

rfic

Full Member level 2 noise simulation for mixer in spectre

GDF

Full Member level 3 mixer simulation

Mazz said:
By definition Noise figure calculations in Spectre are SSB. This is because Spectre simulates the output noise and he doesn't know whether it comes only from one sideband or from both, and then it divide it by gain to calculate NF. But gain (transfer function in the tab, if I well remember) is calculated with a CW only in one sideband.
If you want to see more, do a psp after the pss. In the psp tab you'll find NF, NFDSB, NFIEEE (calculated at 290k).
Regarding the sideband (-1,0 or 1), I remember that in the tutorial there is the equation to calculate results of sidebands. use it.
Bye
Mazz
Hi Mazz, does the tutorial mean the help in cadence?
if it's the case, do you know the doc shows the wrong reference sideband(-1,0, or 1)
when it's referred to the down or up convert.

Status
Not open for further replies.