How To Measure Simultaneous Conjugate Match Of A Device With One Single-Ended And One Differential Port - Agilent Technologies N4413A User Manual

Using the Multiport Test System

How to Measure Simultaneous Conjugate Match of a Device with One Single-Ended and One Differential Port

How to Measure Simultaneous Conjugate Match of a Device
with One Single-Ended and One Differential Port
Calculating the simultaneous conjugate match of a device with one single-ended port is done
in a very similar manner as a device with a simple parameter substitution. For example, if the
DUT is configured as follows:
then, compared to a device with two differential ports, substitute S
S , and S for S
DD21 SD12
1 –
K = -------------------------------------------------------------- -
D = S
11
C = S
1 11
B = 1 –
1
C S
=
DD22
2
B 1
=
2
C
Γ
-------- -
=
GMn
C
where n=1 for port 1 and n=2 for port 2.
74
. Therefore,
DD12
2 2
S – S +
11 DD22
⋅ ⋅
2 S S
DD12 DD21
⋅ ⋅
S – S S
DD22 DS21 S D12
– S
DD22
2 2
S + S –
DD22 11
S
–
11
2 2
S S
– + –
DD22
11
( )
B B
⋅
n
n n
----------- - – -------------- - 1
2 C
2C
n
n
n
2
D
2
D
2
D
2
–
2
for S , S for
11 DD11 DS21
Chapter 3