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Subject: using the size property in Concept
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stump1019
Posts: 4
Online: User is Offline
4/07/2008 5:31 AM  
Doing a design of experiment board with 2000 capacitors. Trying to get 1000 pairs tide in series on one end only. Trying to implement the size property on the components and net so that there will be 1000 pairs. Also trying to implement these pairs into a design reuse module which will be duplicated 3 times. Problem is the size property works ok for the components but the net gets tied to all 2000 components, how can I set this up for only two pins to be tied?
vealmic@uk.ibm.com
Posts: 23
Online: User is Offline
4/09/2008 4:42 AM  
Hi,
Not sure I fully understand your question.

Am I right in thinking that you want 1000 pairs of series connected capacitors?
At one end of each series pair, you want a discrete connection?
At the other end of each series pair, you want all 1000 pairs commoned?

If so, create two caps on your schematic.
Connect them in series.
To each capacitor, add the property SIZE=1000
In the command console, type:
sign mybus<999..0>
and click on the net linking the two caps, creating a 1000 bit bus joining the two caps.

Now you've drawn 1000 pairs of caps in series.

To connect the floating end of one of the caps to 1000 other things, use another 1000 bit bus.

To connect all 1000 floating ends of a cap together, connect a single wire to the sized cap body. Then apply the property SIZE=1000 to the wire. If you are connecting to a power or ground, you should need no SIZE property (I think,becasue the gnd or power body has a NEEDS_NO_SIZE property) .

Does that help, or have I missed the point completely?
ttfn,
vealmic@uk.ibm.com
Posts: 23
Online: User is Offline
4/22/2008 2:52 AM  
Hi,
Attached is a bitmap showing the cct and a copy of our cap and gnd symbols incase you have a problem with yours!
I checked the circuit in the bitmap, and it seems fine.
Hope that helps.
Cheers,
Mike V

Attachment: 2000_caps.zip
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Forums > Silicon-package-board > PCB Design > using the size property in Concept


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