stab_meas()

Returns the stability measure

Syntax
k = stab_meas(S)

Arguments

Name	Description	Range	Type	Required
S	scattering matrix of 2-port network	(-∞, ∞)	complex	yes

Examples

b = stab_meas(S)

Defined in

$HPEESOF_DIR/expressions/ael/rf_system_fun.ael

See Also

max_gain(), sm_gamma1(), sm_gamma2(), stab_fact()

Notes/Equations

Given a 2 x 2 scattering matrix between the input and measurement ports, this function calculates the stability measure. The stability measure is given by:
b = 1+ |S ₁₁ | ² - |S ₂₂ | ² - |S ₁₁ *S ₂₂ - S ₁₂ *S ₂₁ | ²
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.