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Ali, We have been focusing on this for several months now. I think Steve has presented nothing new that hasn't been published and, at a min, agreed to in some form of straw poll. I would like to offer a thought ... For the channel ... we use the SMA and SMA foot print that allows for a clean launch. At both ends of the channel. This allows us to see the SDD11/SDD22 without doing a major de-embedding and still allow for freq to 12.5Ghz. For the tp1 and tp4 ... we then let the tx (tp1) handle the BGA and via, the rx(tp4) handle the via, both cap pads, both via and BGA pad. It will be easier to do the de-embedding and specify the SDD11/SDD22 as seen by the chip from the channel. Just my own thoughts ..... -joel Ali Ghiasi wrote: Steve |