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try to reduce the inductive degeneration values to 0.1 nH per inductance and instead of resistive loading (which rf cracks always dismiss...have a read on it "Microwave Transistor Amplifiers Analysis and Design" by gonzales) try a parallel branch (which will do the same trick without affecting...
hey there! i am designing a 2-stage feedback low noise amplifer for 100Mhz-6Ghz with negative RC feedback on every stage and LC ladder in-/output matching. main specifications: 20-24 dB gain, NF<3dB, S11,S22<-10 dB. the design with ideal lupled elements is complete and shows promising results of...
yes, that what i thik too...the thing is, the real part of SmZ1 is actually postive potted on a linear scale (see picture attached)...it just looks weird when i look at it potted in the smith chart...or is there something i don't get?...
hi.
i use a certain transistor for lna design...after i've stabilized it i wanted to check sm_Z1 in ADS to look at the needed input impedance for maximum gain....but ADS shows me it has to be negaive!!! -1+j... what is going on there???
I ALWAYS check stability!!!....stabfact>1, delta<1, mu_load & mu_source both > 1....that should cover it, i think...i can't specify the IP3, because i only have s-params with noise to for the transistors...they don't alow a IP3 check...or do they?
i obtained the aforementioned characteristics using a depletion mode pHemt (from RFMD)...NOT in cascode configuration, but two stage...all i actually wanted to know is, whether the characteristics "look" good or is there something that may be improved...i'm basically pretty satisfied with the...
well, ready-made amplifiers aren't an option for me...i need to come up with my own design. as regarding specifications my main concerns are:
gain: 15-20 dB
NF < 3 dB
Thank you very much for the good advice...it definitely helped. More suggestions welcome!
Added after 5 hours 2 minutes:
Would it be possible for you to post your designs? Would be of great help and tremendously appreciated. Thank you very much in advance.
Hey there! I'm about to design a 100 Mhz - 6 Ghz LNA, but i'm still not sure which transistors to use. Any recommendations? Would be greatly appreciated. Thanks in advance!
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