Agilent Technologies N4413A User Manual page 83

Note the formula for differential input match:
DIM = (CONJ(C1)/ABS(C1))*(B1/(2*ABS(C1))-((B1^2/(ABS(2*C1))^2)-1)^0.5)
This translates to:
Γ
=
GM
where:
C = S
1 D D11
and where:
B = 1
1
Note the formula for differential output match:
DOM = (CONJ(C2)/ABS(C2))*(B2/(2*ABS(C2))-((B2^2/(ABS(2*C2))^2)-1)^0.5)
This translates to:
Γ
=
G M
where:
C = S
2 DD22
and where:
B = 1 –
2
Chapter 3
How to Measure Simultaneous Conjugate Match of a Differential 2-Port Device
2
C
B B
1
1 1
-------- -
------------ – -------------- - 1 –
C
2 C 2
1 2C
1
1
– S
DD22
2 2
– S + S – D
DD 22 DD 11
2
C
B B
2
2 2
-------- -
------------ – -------------- - 1 –
C
2 C 2
2 2C
2
2
– S
DD 11
2 2
S + S – D
DD11 DD22
2
2
Using the Multiport Test System
73