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Q. Describe transistor stability parameters
The two parameters are
· The stability factor ,K
· Stability measure,ß1
These parameters determine the transistor stability
· K>1, ß1>0 -unconditionally stable
· K<1, ß1>0 -conditionally stable
· K<1, ß1<0 -unstable
This representation does not give a direct indication of the transistor model of the effects on the stability performance. To evaluate the stability parameters in terms of the stability factor first the S parameters are converted to Y parameters.
K=(2Re(Y(11)Re(Y(22))-Re(Y(12)Y(21))/Y(12)Y(21)>1
ß1=Re(Y(22))(Go^2+Y(11)^2)-Re(Y(11)Y(12)Y(21)>0)
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