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wide band input matching in LNA

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katie67

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hi..
I am working on LNA. i want to know that how wideband input matching is acheived in LNA by using filters ( chebyshev or butterworth) . can anyone explain theortically and numerically??
 

Hi,

Chapter 23 of "Analog Design Essentials" by W.Sansen discusses LNAs (and impedance matching), but it doesn't mention either of the filters in your question, not sure if it can help.
 

hi, I don't have this book . can you attach the pic. of that chapter
thank you
 

Impedance matching and filtering are different purposes, although a LC matching network has filter properties and a filter can be designed to provide matching of different source and load impedances.

But a matching network that implements a specific filter characteristic will usually need more LC elements than the pure matching function. Similarly the matching function may need additional elements to the basic filter circuit, particularly for wide band matching.

It's not clear if you are asking just generally about matching networks or have a specific matching problem in mind. In the latter case, you should specify impedances and frequency range.
 

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