[SI-LIST] Re: termination resistor
- From: steve weir <weirsi@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sun, 23 Dec 2012 12:14:24 -0800
Variable resistors have lots of unwanted parasitics. If you are trying
to match an unknown driver to a line, put in a guess value resistor,
issue pulses at a low rate, measure both sides of the resistor and apply
Ohm's Law to find the correct resistor value.
Steve.
On 12/22/2012 7:01 PM, XiaoLiang Tan wrote:
> Dear Expert,
> Hello, I am designing a high speed system.Since I don't know my
> driver's output resistance, thus the termination resistor value is not
> known. Thus may I use the variable resistor? If I use the variable
> resistor, the size is big thus I am unable to put all the resistor near the
> driver.( I have more than 10 outputs needs to be terminated). Which means
> the termination resistor could not be put close to the drivers.
> However, if I use a fixed and small size resistor, I need to trim
> the resistor manually when I doing the testing.
> So may I know that which one is more suitable? Thanks.
--
Steve Weir
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