I don't know of any commercially available true differential VNAs. However, in addition to the ENA mentioned below (which transforms 4-port s-parameters to mixed-mode or differential s-parameters), there is also a 4-port 20 GHz: PNA N5230A (Option 240/245). I'm interested to know if there is a commercially-available true differential analyzer. -- Daniel From: "John Lin" <John@xxxxxxxxxxxx> >=20 > Tim, >=20 > I think you are looking for 4 port VNA.=3D20 > Agilent has one -ENA E5071B, 8Ghz. >=20 > John=3D20 >=20 > -----Original Message----- > From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] = =3D > On Behalf Of TTSP (Timothy Pak) > Sent: Thursday, January 13, 2005 5:13 AM > To: 'SI-List ' > Subject: [SI-LIST] Differential Netwrok Analyzer >=20 > All, > Has any one of you ever used differential network analyzer? Do you know = =3D > which companies are making the equiment? > Thanks, > Tim --=20 ___________________________________________________________ Sign-up for Ads Free at Mail.com http://promo.mail.com/adsfreejump.htm ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu