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3rd March 2007, 04:20 #1
inductor gmd amd
I am looing for the formula about inductance calculation.
How can I calculate straight conducotr inductance ?
Is there any inductance calculation for reference ?
thanks a lot

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3rd March 2007, 06:46 #2
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greenhouse inductance formular
http://www.hills2.unet.com/electron/induct.htm
Regards,
IanP

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3rd March 2007, 12:23 #3
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Re: inductance calculation and formula
If you have access to IEEE see that one(it's well known inductance calculation algorithm ) :
IEEE TRANSACTIONS ON PARTS, HYBRIDS, AND PACKAGING, VOL. PHP10, NO. 2, JUNE 1974
Design of Planar Rectangular Microelectronic Inductors
H. M. GREENHOUSE, SENIOR MEMBER, IEEE
Also if you have access to academic library you might have this book :
F. W. Grover, Inductance Calculations (the above paper based on this book)

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3rd March 2007, 22:55 #4
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Re: inductance calculation and formula
Hallo,
i have some questions on inductance determination.
In general we can decompose L into an
inner conductance, outer self inductance and mutual inductance.
In case of an waveguide (or bondwire interconnect) the mutual inductance
is neglicible if there is no other conductor.
Therefore we have
L = Linner + Lself
Lself is calculated from the magnetic field between signal and ground conductor.
Linner is calculated from the magnetic field inside the conductor.
For high frequencies, the electric field inside the conductor decreases exponentially.
Within the skin effect, skin depth model the following
impedance descriptions are derived
Z= R+jwL= (1+j) sqrt( pi * f * specific resistance * mu )
or
Z= R+jwL= (1+j) * specific resistance / skin depth
This must be the inner inductance ? RIGHT ?
Could someone comment the following statement:
For high frequencies, there is less field inside the conductor, therefore
the outer inductance gets more important.
But resistance increases with frequency, due to the skin effect.
Thanks

5th March 2007, 17:50 #5
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Re: inductance calculation and formula
electr0,
Assuming I understand your question correctly ...
Resitance increases proportionally to the square root of frequency, but the reactance (w*L) increases in direct proportion to frequency. Even though the skin effect does decrease the inductance slightly, the reactance still dominates at higher frequencies.
Hope this helps,
Wiley

5th March 2007, 22:36 #6
inductance calculation and formula
the proximity effect between turns casued less field inside the turn

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12th March 2007, 00:42 #7
Re: inductance calculation and formula
I have studied the paper,
Design of Planar Rectangular Microelectronic Inductors
H. M. GREENHOUSE, SENIOR MEMBER, IEEE.
But I have some questions , AMD(Arithmetic Mean Distance)
and GMD(Geometric Mean Distance).
What do they mean ?
Does any illustration explain AMD and GMD ?
TKX
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