mirjam said:I have been recently designing LNA in AMSC35 from Austriamicrosystems with Cadence SpectreRF. The lowest inductor value they have modelled is 1.32n. Does that mean that they can not do it smaller I don't know but the truth is that they have given only 10-12 inductor models (values).
As for S11 and input impedance I have been thought that the impedance at the input of LNA must be 50 Ohms that would lead to very low S11 parameter. In case of low level signal (that are critical from one side) any reflection lead to possible signal sinking into noise.
In that case as ωTLs=50 Ω the only choice you have is to see how you can decrease ωT, but not too much as there is possiblity that some noise sources that have been neglected could play a part in the NF calculations (gate induced noise- blue noise). As suggested earlier increasing length could be one of the solutions.
another perhaps to use bondwire or something that could give the value you have precalculated.
bcdeepak said:hi khouly
i wrote mistake in my last msg
what i want to tell is while simulating the LNA ..... is required to give the source resistance ???? ........ i saw some LNA papers where the simulation is done using ADS , so there they did not give the source resistance in the simulation schematic
my problem is when i include the source resistance in the ckt .... dip of the NF curve is not exactly not occuring at 2.4GHz ... it is occuring at 2GHz ... but when i remove the source resistance the dip is occuring @ 2.3GHz
so is it required to give Rs in the simulation ???
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