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Altera_Forum's avatar
Altera_Forum
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17 years ago

Clock Termination

Hi all,

I am running a Stratix II (PCIe Dev Kit) clock of 25Mhz. But my line length to the device is 12" with impedance of 100 Ohms. I need to do a Thevenin termination for the clock, but I am not sure how to calculate the two resistors R1 and R2 required for this. Vcc is 3.3V.

If anyone can help that will be of great.

Thanks in advance.

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    17 years ago

    You don't need more than a source side series termination of 100 ohms.