[SI-LIST] Re: de-embedding of mems
- From: "package_char" <emc_gibney@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- 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.
> Ph:353 21 4904401
>
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