[SI-LIST] Re: de-embedding of mems
- From: "gh c" <ghc20038@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 25 Sep 2003 02:29:47 +0000
Hi Kaustubh,
Dan and Eoin had given some good points. I would just like to summarize few
points here.
1)when come to loss compensation, one can go for scalar or vector approach.
It is all depending on matching to your input/output DUT. If you have a
match input/output network, then scalar approach is valid (in this case
reflectionless. as pointed out by Eoin). If you have a mismatch network,
then vector approach is the correct method to use, as you have to take the
reflection into account. One needs to understand the differences so tht to
accurately characterize the device.
2)There are few ways to deembed the traces/launchers towards the DUT. First
of all you need to define your reference planes. Then characterize those
traces/launchers between the planes. To do this, you can use either i)two
tier calibration approach OR ii)delay lines approach (for example, TRL. as
pointed out by Dan).
Hope this would help you.
Thanks.
gh
>From: "package_char" <emc_gibney@xxxxxxxxxxx>
>Reply-To: emc_gibney@xxxxxxxxxxx
>To: si-list@xxxxxxxxxxxxx
>Subject: [SI-LIST] Re: de-embedding of mems
>Date: Wed, 24 Sep 2003 08:41:29 -0000
>
>Hi Kaustubh,
>
>If reflections are neglible (as close to zero as possible) then it is
>possible to estimate the effect of cascading a number of two port
>networks by adding/subtracting the dB values of the S21 coefficients.
>This is what i think the person in the paper you have reviewed has
>done.
>
>I don't know the procedure for de-embedding mems structures but if
>for example removing test fixture effects from a measurement then
>firstly you have to characterise the test fixture using s-parameters,
>convert these to their transfer matrix representation and using
>inverse matrix multiplication you can remove the test fixture
>effects.This will give you the return loss and insertion loss of the
>DUT.
>
>Hope this is of use
>
>Eoin Mc Gibney
>Postgraduate student
>AWS group
>CIT
>Cork
>
> > >> >> -----Original Message-----
> > >> From: Kaustubh Bhate [mailto:kbhate@xxxx]
> > >> Sent: Tuesday, September 23, 2003 7:57 AM
> > >> To: si-list@xxxx
> > >> Subject: [SI-LIST] de-embedding of mems
> > >>
> > >>
> > >> Hi,
> > >> Can somebody point me to a standard/known procedure for doing
> > >> de-embedding of
> > >> mems measurements?
> > >>
> > >> I have seen a paper that subtracts the insertion loss (in
> > >> dB)of an identical
> > >> thru-line from "a mems-switch-interconnect" assembly
> > >> measurement(in dB).Is that
> > >> a correct/reasonable approach of eliminating the loss from
> > >> the pad parasitics
> > >> and the interconnects?
> > >> If the the raw s-parameters are subtracted for the same, as
> > >> above,(instead of at
> > >> the dB level) the results are totally different.
> > >>
> > >> Also what about de-embedding for return loss? Using the same
> > >> approach as above
> > >> (working in the dB domain), the results do not make sense.
> > >>
> > >> De-embedding for mems passive componenst would be different
> > >> than for the active
> > >> devices like transistors where the de-embedded parameters are
> > >> not referenced to,
> > >> any "entity".
> > >>
> > >> Thanks in advance.
> > >>
> > >>
> > >> Regards,
> > >>
> > >>
> > >> Kaustubh Bhate
> > >> Transducers Group
> > >> NMRC
> > >> LEE Maltings
> > >> Prospect Row
> > >> Cork.
> > >> Ph:353 21 4904401
> > >>
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> > Kaustubh Bhate
> > Transducers Group
> > NMRC
> > LEE Maltings
> > Prospect Row
> > Cork.
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