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i use in the ampliefier design guide > s-parameter in ADS, it doesnt work well. The noise figure not change when i use different frequency and voltage... my friends said that maybe the typical ofthe S parameter..i confused with that..
oya...
oya.... i design preamplifier in the range 130-140 Mhz in cascade (2 or 3) so i can get high gain...
is it can be modeling with multisim?...
is any example in multisim? or ADS?.....
i have been search in this forum but i can solve my problem...
If you check the NF file you find that there are only two NF points, so you need a simulation software able to interpolate the results for different frequencies.
With voltage the NF anyway will not the change, because in the S-param/Noise file is specified only at one bias point.
i think, that the reason why it doesnt work with other frequency...
but what you (vfone) mean about a simulation software...is you mean BF998 can not be simulate by ADS...because the paramater is specified at one bias point so whatever i configured the bias circuit, i unable to get dynamic Noise Figure (change with different frequency)....
I mean a linear simulation is using an s2p file, (where parameters are specified at only one bias point) and whatever DC bias you change in the schematic, the noise will not change.
To get NF vs bias change, you need a nonlinear simulation, using a nonlinear model (not s2p).
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