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Forums
4hv.org :: Forums :: General Science and Electronics
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PCB Squiggles

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Thomas W
Mon Sept 16 2013, 07:29PM Print
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
 		Hey, i was watching
a video on youtube taking appart somthing and they showed this:
Aha7Sco
they didnt explain it or anything, but what is it?

i suspect its like pcb drawn inductors, i have no clue...
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BigBad
Mon Sept 16 2013, 08:03PM
BigBad Registered Member #2529 Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
 		Maybe they just need the track lengths to be the same for some reason?
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Erlend^SE
Mon Sept 16 2013, 08:12PM
Erlend^SE Registered Member #1565 Joined: Wed Jun 25 2008, 09:08PM
Location: Norway
Posts: 159
 		Track length matching, for timing reasons.

You got a processor there and RAM(DDR2 or 3 probably) and the ram is clocked at 100+++ MHz.

Some of the traces are added length and balanced, probably tricky to route.
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Thomas W
Mon Sept 16 2013, 09:55PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
 		Interesting... would have never thought of that!
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TwirlyWhirly555
Tue Sept 17 2013, 05:48AM
TwirlyWhirly555 Registered Member #4104 Joined: Fri Sept 23 2011, 06:54PM
Location: Uk .
Posts: 122
 		If you look on the bottom of some motherboards for pcs , there will be wiggles in the traces going to and from the CPU socket to the ram modules .

makes em all the same length .
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Shrad
Tue Sept 17 2013, 10:19AM
Shrad Registered Member #3215 Joined: Sun Sept 19 2010, 08:42PM
Location:
Posts: 780
 		propagation delay equalization

this is a feature modern CAD programs would propose for auto-routing buses
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Killa-X
Tue Sept 17 2013, 03:59PM
Killa-X Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
 		I figured that or some form of inductance like you find on some RF boards, but those get really fancy usually xD
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Alex M
Tue Sept 17 2013, 05:01PM
Alex M Registered Member #3943 Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552
 		EEVblog isn't it? I think he has a video somewhere that explains these impedance matching tracks.
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Thomas W
Tue Sept 17 2013, 08:39PM
Thomas W Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
Alex1M6 wrote ...

EEVblog isn't it? I think he has a video somewhere that explains these impedance matching tracks.

Yes, i believe it is, i havent seen it however (i have watched most EEVblogs, but not that one it seems.../)
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Killa-X
Thu Sept 19 2013, 05:27PM
Killa-X Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
__=|(:3)-|--{__ wrote ...

Alex1M6 wrote ...

EEVblog isn't it? I think he has a video somewhere that explains these impedance matching tracks.

Yes, i believe it is, i havent seen it however (i have watched most EEVblogs, but not that one it seems.../)



Was done 4 months ago for the Agilent Spectrum Analyser ^^

Least if thats the one your talking about. He's done soooo many videos on PCB traces its crazy..
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