difference between large signal s parameter and x- parameter

[me_forouzan]

Could you please tell me the difference between large signal s-parameter and x-parameter?
thanks

 

[BigBoss]

S-parameters are Port parameters and they are linear.They don't have any information about nonlinearity about the device.
X-Parameters behavioural parameters and they are nonlinear and they have nonlinearity information about the device.

 

[me_forouzan]

LARGE signal s-parameter is not have non linear information?

 

[BigBoss]

LARGE signal s-parameter is not have non linear information?

No,large signal s-parameters are always linear.The difference between small signal s-parameters is signal drive level only.They corralate port realations such as reflection,transmission,isolation.