[SI-LIST] ECL terminations
- From: "k EPD" <epd2001usa@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 09 Sep 2002 15:25:28 -0400
Where is the best place to put the resistors to Vtt (-Vee) ?
At the source or destination of the run?
keith
Keith Kowal 781-593-0199 epd2001usa@xxxxxxxxxxx[1] www.nvplanner.com[2]
>From: Samuel Dadel >Reply-To: samuel_dadel@xxxxxxxxx >To:
si-list@xxxxxxxxxxxxx >Subject: [SI-LIST] Termination resistance value for
GTL+ bus >Date: Mon, 9 Sep 2002 12:11:15 -0700 (PDT) >>>Hi! All, I am new to
transmission lines: so I would greatly appreciate of someone could give me
some leads on the following. I am employing a dual-ended parallel
terminationscheme for a GTL+ bus. The driver has the capacity to sink 50mA.
The Vol is .5 and the Voh is 1.5, and the Vref is 1.0 [Nominal]. When
employing a 50ohm termination scheme I see a voltage swing of 1.15 Volts at
the driver, with Vol gone down to 0.3 Volts. The nominal values >>are 1.5
and0.5. I get bit errors, that go away when Vref >>is lowered to 0.8 Volts.
>>Could this be a case of unmatched termination? In addition: these is this
additional equation that I cannot relate to the characteristic impedance of
the trace. Iol[max] = .050 Amps. Iol = Vtt - Vol / R[eff]. R[eff] = 1.5 -
0.5/ .050 = 20 ohms. For a dual ended termination scheme Rtt = 20 * 2 = 40
ohms.Thanks,Daniel >>>>--------------------------------- >Do You Yahoo!?
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