i agree wih u,but he may choose another amplifier with small s12,or using techniques that explained in gonzaliz book of amplifer design,that using 1/s12 insted of s12dsjomo said:In analog designer's word, Positive feedback.
In microwave designer's word, potentially unstable.
Mazz said:The definition of stability factor (from @DS help)
Given a 2 x 2 scattering matrix between the input and measurement ports, this function calculates the stability factor.
The Rollett stability factor is given by
k = {1- |S11|**2 - |S22|**2 + |S11*S22 - S12*S21| **2} / {2*|S12*S21|}
The necessary and sufficient conditions for unconditional stability are that the stability factor is greater than unity and the stability measure is positive.
Reference
[1] Guillermo Gonzales, Microwave Transistor Amplifiers, second edition, Prentice-Hall, 1997.
As you can see, the S12 is directly involved in this function, and, as the S12 increases k decreases.
I hope it can help.
Mazz
djalli said:K is a natural number. You want to plot it vs. frequency??
In @DS there is an icon for stability in S-Simulation, possibly you can write an equation to extract it.
dsjomo said:cmosbjt, there is a instance named StabFact under s-parameter simulation tag under @DS, use that instance you can plot k factor in @DS. That is the convinient way you want.
hcseu said:some useful applications
cmosbjt said:Hi, how to plot the K factor in ADS? Thanks.
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