Some tools use negative inductance or negative capacitance to cancel the effect
of inductance or capacitance (similar to de-embedding). Sometimes you also get
negative values if the inductance you "measure" is in fact a capacitance.
Depends on the tool you use, but it is never physical, only mathematical.
I have only seen one negative inductance:
https://4gang.wordpress.com/how-to-build-a-negative-inductance/
-lol-
Mit freundlichen Grüßen / Kind regards.
Gert Havermann
Signal Integrity Engineer
Dept.: Corporate Technology Services
HARTING Stiftung & Co. KG
Marienwerderstraße 3
D-32339 Espelkamp
Phone +49 (0)5772 47 857
Fax +49 (0)5772 47 90857
mailto:gert.havermann@xxxxxxxxxxx
http://www.HARTING.com
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx <si-list-bounce@xxxxxxxxxxxxx> Im Auftrag von
Binayak Shrestha
Gesendet: Freitag, 17. Januar 2020 10:51
An: a.v.n.kalyanram@xxxxxxxxx
Cc: Si-list <si-list@xxxxxxxxxxxxx>
Betreff: [SI-LIST] Re: Help:Negative Loop Inductance
Normally, we define loop inductance with self partial inductance and mutual
inductance. You can't have a negative loop inductance.
Binayak
On Wed, 15 Jan, 2020, 9:51 pm Akunuru Venkata Naga Kalyan Ram, <
a.v.n.kalyanram@xxxxxxxxx> wrote:
Hello SI/PI Altruists,
I have a question regarding Power Plane loop Inductance phenomenon. I
have
a*
6'x6" board with 2 layers* (Power and GND planes) and I have defined 2
ports , each one on each edge of the board like a edge connector.
I am using a third party tool to do the simulation and the results
show that the *loop inductance* has a peculiar resonance below 200 MHz
and the value goes to -400 nH.
What is this phenomenon? What does the negative value of Inductance imply?
Can inductance value be negative?
Thank you in advance.
--
Warm Regards:
A.V.N.Kalyan Ram
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