Hello, in my circuit i have input RF Vsin signal and a differential signal from both sides of the capacitors as shown bellow.
The noise simulation shown bellow demands a PORT input for the NF calculation, if i enter source input instead its just not running the simulation
but when i enter a PORT and define it as Shown bellow it shows me 200dB
i think we have 200dB because there is no input signal(although we did defined it)
what could be done to simulate properly noise figure ?
Andrew Beckett said:There is no need to have a large signal present in the simulation for this to be done.
Hello, my RF port is not large signal.its sine amplitude is 100mv.
only my LO signals are large signal, i will be glad to know what is your definition to large signal to avoid misunderstanding.
i am using the following spectreRF workshop which title shown bellow.
So your signals are almost certainly small enough that you do not need to specify it as a sine source for the pnoise/hbnoise analysis, as I've said several times already.
You appear to be using a pretty old version of Spectre (if that workshop is from the spectre version you're using). That will have been release about 13 years ago - which makes no sense. I'm slightly confused as you were using harmonic balance earlier, and that was not available in that version of Spectre. I would strongly recommend using the workshop from the version of spectre you're actually using (since it's in the installation). If you're really using MMSIM6.0, please use a newer version - we don't release a new major version every year just for the fun of it!
Got it :-) thank you very much.