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I've simulated the noise factor of Mixer ne600p in rfExamples library with PSS+Pnoise. With the Noise Summary printed, I calculated the Noise Factor, which is (total noise at output - load noise at output)/(source noise at output), then Noise Figure can be abtained with 10*lg(Noise Factor). However, my result is very different from the Noise Figure of Pnoise.
Device Param Noise Contribution % Of Total
/rif rn 5.70677e-19 23.13 IF_OUTPUT_Port/q57 rb 2.86098e-19 11.60 /rf rn 2.74587e-19 11.13 RF_INPUT_Port/q56 rb 2.71557e-19 11.01 /r45 rn 1.60586e-19 6.51 /q57 ic 1.54208e-19 6.25 /q56 ic 1.1156e-19 4.52 /rl1 rn 1.03425e-19 4.19 /r44 rn 8.357e-20 3.39 /r46 rn 7.25826e-20 2.94 /q56 ib 5.65173e-20 2.29 /q58b rb 5.51435e-20 2.23 /q58a rb 5.51435e-20 2.23 /lo rn 4.66997e-20 1.89 /q58a ic 4.14535e-20 1.68 /q58b ic 4.14535e-20 1.68 /q58b ib 1.98622e-20 0.81 /q58a ib 1.98622e-20 0.81 /q56 re 1.28295e-20 0.52 /q57 re 1.27064e-20 0.51 /q57 ib 7.93188e-21 0.32 /q58b re 3.43834e-21 0.14 /q58a re 3.43834e-21 0.14 /q58a rc 9.14375e-22 0.04 /q58b rc 9.14375e-22 0.04 /q57 rc 9.88927e-23 0.00 /q56 fn 4.43245e-23 0.00 /q56 rc 1.67595e-23 0.00 /q58b fn 3.9707e-24 0.00 /q58a fn 3.9707e-24 0.00 /q57 fn 1.26023e-24 0.00 /rl1 fn 0 0.00 /rif ext_file_noise 0 0.00 /rf ext_file_noise 0 0.00 /r46 fn 0 0.00 /r45 fn 0 0.00 /r44 fn 0 0.00 /lo ext_file_noise 0 0.00 /lm fn 0 0.00 /lm rn 0 0.00 /ldc fn 0 0.00 /ldc rn 0 0.00 /L1 fn 0 0.00 /L1 rn 0 0.00 /L0 fn 0 0.00 /L0 rn 0 0.00
Spot Noise Summary (in V^2/Hz) at 80M Hz Sorted By Noise ContributorsTotal Summarized Noise = 2.46733e-18Total Input Referred Noise = 8.63267e-18The above noise summary info is for pnoise data
Total Noise at Output: No^2 = 2.46733e-18 V^2/Hz
Load Noise at Output: Nl^2 = 5.70677e-19 V^2/Hz
Source Noise at Output: Ns^2 = 2.74587e-19 V^2/Hz
Noise Factor: N = (No^2 - Nl^2)/(Ns^2) = 6.90729
However, according to the Noise Factor curve of Pnoise, noise factor @
80MHz is 43.11, which is very larger than 6.90729.
There must be something wrong. Anyone can help me?
Thanks in advance!
See worked example of single and double sideband noise figure in a mixer. Your mistake (from a very quick glance) is that for the denominator you are using the total output noise from the input source, rather than the output noise from the input source from the passband only (i.e. the reference sideband). Otherwise the resulting noise figure is not the ratio of the signal to noise at the input to the signal to noise at the output.
Anyway, it's covered in more detail in my solution linked to above.
In reply to Andrew Beckett:
It's a great help.
Thank you Andrew.