pss+pnoise for LNA
时间：04-09
整理：3721RD
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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...?
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...?
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".