[SI-LIST] Re: 200ohm to 50ohm Baluns (200ohm diff impedance?)
- From: "Richard Feldman" <rfeldman@xxxxxxxxxxx>
- To: <cadpro2k@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 21 Oct 2004 16:12:30 -0700
Hi Mitch.
I've used those baluns together with resistive matching networks,
between 50-ohm instrumentation and 150-ohm balanced lines
(standard Fibre Channel copper cables). =20
One must take into account the attenuation of the matching network,
which (with a cable connected) presents 200 ohms to the balun.
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Mitch S. Morey
> Sent: Thursday, October 21, 2004 2:50 PM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] 200ohm to 50ohm Baluns (200ohm diff impedance?)
>=20
>=20
> Hi all,
>=20
> Has anyone had experience with the 200ohm to 50ohm baluns=20
> from TDK? If so,
> were you (did you) able to define a 200ohm differential impedance
> structure on the printed circuit board it was used on? How do=20
> you get a
> 200ohm differential impedance structure at all? Anyone? The circuit
> structure only works out to be about 1/4 inch long, but some engineers
> question what would happen if it doesn't get 200ohms.
>=20
> Any help is appreciated. Thanks.
>=20
> Mitch
>=20
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