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Degradation of NA in pss+pnoise simulations for LNA

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Alex_IC

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pss+pnoise for LNA

Hi!
I try to simulate NF for LNA vs input RF power (prf) for a particular freq. My pss+pnoise is:

pss fund=1G harms=20 errpreset=conservative method=gear2only annotate=status

pnoise sweeptype=absolute start=1G lin=50 maxsideband=10 oprobe=PORT1 iprobe=PORT0 refsideband=0 annotate=status

I got NF of 80 dB even at very small prf. The LNA is ok, it has sp NF of 3 dB.

If only I set start=1.1G in my pnoise, I got right NF vs prf about 3 dB with small prf and higher with higher prf.

But what is the reason NF at exact 1 GHz degrade so much with pss+pnoise simulation...?
 

Re: pss+pnoise for LNA

Alex_IC said:
Hi!
I try to simulate NF for LNA vs input RF power (prf) for a particular freq. My pss+pnoise is:
pss fund=1G harms=20 errpreset=conservative method=gear2only annotate=status
pnoise sweeptype=absolute start=1G lin=50 maxsideband=10 oprobe=PORT1 iprobe=PORT0 refsideband=0 annotate=status
I got NF of 80 dB even at very small prf. The LNA is ok, it has sp NF of 3 dB.
If only I set start=1.1G in my pnoise, I got right NF vs prf about 3 dB with small prf and higher with higher prf.
But what is the reason NF at exact 1 GHz degrade so much with pss+pnoise simulation...?
Click to expand...
1GHz could be singular for pnoise since 1GHz is fundamental frequency of PSS.
So pnoise result around 1GHz could be less accurate.

Try pnoise with adding parameter "solver=std".
 

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