[SI-LIST] Re: Diff. Bal. to Unbal. Transition
- From: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>
- To: "Vinu Arumugham" <vinu@xxxxxxxxx>
- Date: Wed, 10 Sep 2003 10:30:04 -0700
Hmmm - I guess they could be, if ground was used as Vref. I guess I =
haven't seen that case lately, so overlooked that possibility.
In the single-ended signalling technologies I'm more familiar with =
(AGTL, for instance), AC coupling wouldn't work, without some complex =
scheme to re-introduce the DC component of the signal.
Thanks for catching this...
Jeff Loyer
-----Original Message-----
From: Vinu Arumugham [mailto:vinu@xxxxxxxxx]
Sent: Wednesday, September 10, 2003 10:23 AM
To: Loyer, Jeff
Cc: si-list@xxxxxxxxxxxxx
Subject: Re: [SI-LIST] Re: Diff. Bal. to Unbal. Transition
Loyer, Jeff wrote:
> e) differential pairs can be AC-coupled - allowing different DC =3D
>levels for the transmitter and receiver.
> =20
>
AC coupling should work for single-ended signals as well. Why would this =
apply only to differential signals?
>
>And finally, I'm not sure how a balun is applied in this situation. A =
=3D
>single balun would transition the differential pair to a single =3D
>single-ended signal (say that 3 times quickly!), and then another one =
of =3D
>the far end would convert that back to a differential pair? That may =
be =3D
>done, but I haven't heard of it in PCB applications. But, I wouldn't =
be =3D
>surprised to find out it's done for applications I'm not familiar with.
>
> =20
>
Theoretically, a couple of baluns can be used to interface the loosely=20
coupled and tightly coupled sections. In practice however, the balun=20
loss and physically connecting the balun to the traces without=20
introducing mode conversions, would pose a bigger challenge than the=20
original problem.
Thanks,
Vinu
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