Load stability circle and smith chart

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Lathas

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Why do I get so many smith charts in a single ( 4 circles starting from the centre?) graph while plotting L_stabcircle using smith chart(from the palette) in ADS? Which smith circle to choose for interpreting the stable region for output stability circle?
 

Because you have 4 frequency points.Each one will show you which output impedance makes your amplifier stable or unstable..
 

Stability Circles are outside of the Smith Chart that's why ADS used extended Smith Chart.
If a circle is outiside of the Smith Chart, there isn't any real impedance that makes your amplifier unstable.It means your amplifier unconditionally stable.
But make zoom and check other circles carefully.
 

Is there any option to turn off extended smith chart and see the single chart in ADS (other than using smithchart utility)?
 
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