[SI-LIST] Re: four S channels VNA
- From: "John Fisher (jmfisher)" <jmfisher@xxxxxxxxx>
- To: <Giovanni.Guasti@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 21 Jul 2005 10:05:02 -0700
Guasti,
Try;
http://vnahelp.com/
Its a helpful website
John
=20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Guasti Giovanni
Sent: Thursday, July 21, 2005 2:16 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] four S channels VNA
dear all,
our laboratory bought two hibrid junctions a long time ago. I am trying
=3D to obtain a four S channels VNA, placing the hibrid junctions in
series =3D to our two S channel VNA. I would like to realize some
differential =3D scattering measurements (at the moment we couldn't buy =
a
new 4 channel =3D VNA).=3D20 How would you calibrate the whole system? =
Do
you know any article, =3D paper, web-site where I could read more about
it? Do you think a =3D differential to common mode coupling could affect
the measurement?
I'm waiting for all your objections. ;-) Thankyou all,
Giovanni
HJ +90=3DB0 |------| HJ -90=3DB0
|-------| diff |-------|
VNA S1-------< | DUT | >------- VNA S2
|-------| |-------|
|------|
HJ -90=3DB0 HJ +90=3DB0
=3D20
^ ^
| |
sect1 sect2
all cables have same length,
all cables have Z0=3D3D50ohm
Hibrid Junctions have a bandwidth B - so the measure will be done in B
-----------------------------------------------------------
open (S2 is symmetrical)
HJ +90=3DB0 =3D20
|-------High impedance
VNA S1-------< =3D20
|-------High impedance
=3D20
HJ -90=3DB0 =3D20
-----------------------------------------------------------
short (S2 is symmetrical)
HJ +90=3DB0 =3D20
|-------0ohm
VNA S1-------< =3D20
|-------0ohm
=3D20
HJ -90=3DB0 =3D20
-----------------------------------------------------------
50ohm (S2 is symmetrical)
HJ +90=3DB0 =3D20
|-------50ohm
VNA S1-------< =3D20
|-------50ohm
=3D20
HJ -90=3DB0 =3D20
-----------------------------------------------------------
through
HJ +90=3DB0 HJ -90=3DB0
|--------------|
VNA S1-------< >------- VNA S2
|--------------|
=3D20
HJ -90=3DB0 HJ +90=3DB0
=3D20
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