Thank you everyone who answered my question. I have a much better
understanding of the issue now.
Regards,
/Mikhail
-----Original Message-----
From: Ihsan Erdin
Sent: Tuesday, November 03, 2015 7:36 PM
To: olaney@xxxxxxxxx
Cc: matusov@xxxxxxxxxxxx ; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: PDN impedance measurements
Orin has a point. A tracking generator+DUT+SA combination will yield a
single parameter at a time and it will be in scalar format. If the output
of TG and input of SA are connected at different test points of the DUT, SA
will display |S12| parameter between these two points. The output data from
SA can be used to have an idea about resonances etc. but cannot be used to
characterize the DUT in a circuit simulator because of the scalar nature of
data. A VNA, on the other hand, will output both the real and imaginary
part (or magnitude and phase) of data in complex form (and at all probed
port parameters, S11, S12, etc.), hence the name for VECTOR network
analyzer. A VNA output can directly be fed into a circuit simulator which
can massage it for passivity, etc.
Regards.
Ihsan Erdin
On Tue, Nov 3, 2015 at 5:05 PM, Orin Laney <olaney@xxxxxxxxx> wrote:
Spectrum analyzer + tracking generator is essentially an S21-only scalar
network analyzer. The VNA is a more complete and versatile instrument.
Orin
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On
Behalf Of Mikhail Matusov
Sent: Tuesday, November 03, 2015 1:31 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] PDN impedance measurements
Hi gurus,
Please forgive my ignorance, but could someone enlighten me on what are
the
limitations of the PDN impedance measurement method using a spectrum
analyzer and tracking generator as described by Lee Ritchey in his "Right
The First Time" book compared to using a VNA as described for example in
Istvan Novak's "Frequency-Domain Power-Distribution Measurements - An
Overview" paper? I don't have practical experience with network analyzers
but very familiar with the spectrum analyzers hence the question.
Thanks,
/Mikhail
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