In our LNA design using ADS the s-parameter s(1,2) ands(2,1) are similar and negative.Is there any specific method to obtain s-parameters in advanced design system.In this design we have used MOSFET_NMOS and MOSFET_PMOS from RF library.We are new to this software please help.
We checked DC operating point using both DC annotation and FET curve tracer but we got different values.How do we use these values in LNA schematic in order to get postive gain.
we have made the changes in circuit schematic and simulated.we biased the transistor and used these values in schematic but even then the gain is negative can you suggest some 130nm transistor model.
We did check the DC operating point and simulated the schematic and still are getting negative gain. Have we used the bias characteristics value correctly ? If not how do we do it ?
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