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Interstage inductor in Cascoded LNA!

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MK28

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hi all,

I've seen some Cascoded LNA design where interstage inductor were placed between 2 transistors. I do not get the clear idea about it !! I am looking for a theoretical explanations for this. Can anyone help......this is really urgent!!

Please, any site or books or journals to get a clear idea ?

MK28
 

ccw27

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Well basically the inductor is there to cancel the parasitic capacitance between the 2 transistors. At low frequency the parasitic capacitance has little influence on noise but at high frequency it shunts the AC signal and degrades noise figure.
 

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