There are different performances, but you'd better check all of it, at least some combination.
The potential candidate blocks are the RF amplifier and the LO. What I do is, run HB analysis for these all these blocks indvidually and combine to see the system response in terms of BER, etc...
If you have full S parameters of the amplifier then it may be worthwhile to derive it's stability factor k.Does this approach work even for only system design? i.e. we have only S-parameters of component obtained from manufacture and non-linear behaviour data reported in datasheet. Our question is: if we insert these data into ADS's behaviour models and run HB analysis, would we have some information about stability condition?
Stability analysis using with s-parameters will be valid only and only single stage amplifiers, therefore they cannot be used for whole system that includes many stages,mixers,filters etc.Does this approach work even for only system design? i.e. we have only S-parameters of component obtained from manufacture and non-linear behaviour data reported in datasheet. Our question is: if we insert these data into ADS's behaviour models and run HB analysis, would we have some information about stability condition?
Regards,
Antonio L.
if you are just stringing together wideband amps on a PC board to form 60 dB of gain at 400 MHz, yes you might have an oscillation problem. For one thing, try adding a bandpass filter somewhere along that 60 dB gain chain. That way an oscillation will not happen at any frequency, but only will be possible around 400 MHz. THEN play around with shielding and phase lengths to that the output of the IF chain is out of phase with the input of the IF chain.
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