s_stab_circle()

Returns source (input) stability circles

Syntax
y = s_stab_circle(S, numOfPts)

Arguments

Name	Description	Range	Type	Default	Required
S	scattering matrix of a 2-port network.	(-∞, ∞)	complex		yes
numOfPts	desired number of points per circle	[1, ∞)	integer	51	no

Examples

circleData = s_stab_circle(S, 51)
returns the points on the circle(s)

Defined in

$HPEESOF_DIR/expressions/ael/circle_fun.ael

See Also

l_stab_circle(), l_stab_region(), s_stab_circle_center_radius(), s_stab_region()

Notes/Equations

Used in Small-signal S-parameter simulations.
This expression generates source stability circles. The circles are defined by the loci of source-reflection coefficients where the magnitude of the load-reflection coefficient is 1. A circle is created for each value of the swept variable(s). This measurement is supported for 2-port networks only.
To find the center and radius of the stability circle use the following expressions:
cir=s_stab_circle(S,2)
cir_center=sum((cir[0::1]) /2)
cir_radius=abs(cir[1]-cir[0]) /2
Alternately, the function s_stab_circle_center_radius() can be used. Use the function s_stab_region(S) to determine the region of stability.