zhangren
Newbie level 2
Dear friends
These days I am designing a 2-stage power-amplifier in 5.8 GHz in ADS , but when I test the S parameter , there is something strange about its MAG(max available gain ) , in low frequency , its MAG is -3040 while in 5.8 GHz its MAG is normal . when I test the first and second stage PA separately , the S-parameters and MAG of both PA are normal . The problem only exists when the PAs are put together. Is it the problem of arithmetic inside ADS ? Or the problem of my circuit ?
Could anyone help me , tell me where the problem is ? Thank you very much !
These days I am designing a 2-stage power-amplifier in 5.8 GHz in ADS , but when I test the S parameter , there is something strange about its MAG(max available gain ) , in low frequency , its MAG is -3040 while in 5.8 GHz its MAG is normal . when I test the first and second stage PA separately , the S-parameters and MAG of both PA are normal . The problem only exists when the PAs are put together. Is it the problem of arithmetic inside ADS ? Or the problem of my circuit ?
Could anyone help me , tell me where the problem is ? Thank you very much !
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