[SI-LIST] Re: Selecting source/sink nodes for single ended vs differential in Q3D
- From: Krishna Chaitanya <krishna1abc@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 26 Apr 2012 07:56:32 -0700
Just to make my question clear.
1. Will the placement of source/sink nodes make a difference in single
ended vs differential?
From my understanding, differential bus can be just a pair of two single
ended bus(bits) with only difference being at the receiver side, we connect
sig+ and sig- to the diff pair instead of single ended signal and a common
ref voltage used in single ended.
2. In Q3D extractor help,it says that for obtaining the parasitics, one
source is picked at a time grounding all the other source and sinks. So do
we even worry about source and sink placements for single ended vs
differential bus for parasitic extraction?
Thanks,
Krishna
On Thu, Apr 26, 2012 at 7:12 AM, Krishna Chaitanya <krishna1abc@xxxxxxxxx>wrote:
> Hello All,
>
> I have a question regarding the choice of source/sink nodes in extracting
> parasitics for single ended vs differential bus in Q3D
>
> Assume two cases,
>
> 1. Single ended bus.
>
> For extracting parasitics in this case, I place all the source nodes (S+)
> on one side and all the sink nodes(S-) on the other. So for a 2 bit bus it
> looks like below.
>
> Chip A Interconnect
> Chip B
> bit1 Q3DSource ------------------------------
> Sink
> bit2 Q3DSource ------------------------------
> Sink
>
> 2. Differential bus.
>
> In this case, I placed the source and sink nodes as below.
>
>
>
> Chip A Interconnect
> Chip B
>
> bit1 + Q3DSource --------------------------------Sink
> bit1 - Q3DSink
> --------------------------------Source
>
> bit2+ Q3DSource ------------------------------- Sink
> bit2- Q3DSink -------------------------------
> Source
>
>
> Does the above method looks correct?
> Kindly let me know your opinion on how to provide "source" and "sink"
> nodes while extracting parasitics for single ended and differential bus
> using Q3D.
>
> Thanks,
> Krishna
>
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