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Time delay through resistors (for trace length matching)

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OradFarez

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delay through a differential trace length

Does anyone know how to roughly determine the delay through the body of surface mount components? In my case, I am trying to determine the electrical length of a 0603 resistor, 22 ohms with a clock rate of 133MHz. The reason for this is to aid me in trace length matching.

Thank you.
 

length matching

i think the delay is depends on the value of the resistor not the size of the resistor body
 

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    OradFarez

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time delay vs trace length

Hi,


Its the value of the resistor and not the size matters here...


Regards

Ramesh
 

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    OradFarez

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can i use resistor as time delay

Thanks to both of you. Is there a formula one can use to calculate how a series resistor (the value specified above) will slow a signal down?

I can't help but think the size of the part has some effect because the voltage has to travel across the part still and that is at least 2mm or maybe it is the dc resistance that dwarfs this physical distance?
 

what are the trace widths leading up to and away from the resistor, the solder pad sizes, the board dielectric constant, and the thickness between the top trace and the ground plane?
 

Hello.

Trace width: 0.250mm
Trace space: 0.200mm (differential clock traces)
Board dielectric: FR4, er=4.7 max
Solder pad sizes: 0603 pattern, 0.750x1.000mm x2, spaced 0.700mm apart
Distance to GND plane: 0.25489mm


If you have an impedance calculator and are willing to put the numbers in, I thank you very much!
 

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