Transmission Line

Document 1144-1
SPICE Model
These transmission line models simulate the frequencydependent behavior of Coilcraft VS series surface mount
air core inductors within the frequency limits shown in the
accompanying table for each individual inductor. They
are based on empirical measurements using a 1-port
impedance analyzer (HP4991 with a 16193A test fixture).
Effects due to various circuit board traces, board materials, ground planes or interactions with other components
are not included. They may have a significant effect
when comparing the simulation to measurements of the
individual inductors using other production verification
instruments and fixtures.
The model schematic, shown below, combines an ideal
transmission line model with lumped elements. The individual element values k, R1, R2, C, Z0, EL, and F0 are
listed in the table for each spring inductor.
RVAR
P1
50 Ohm
C
R1
TL1
Z0
EL
F0
R2
P2
50 Ohm
Each model should only be analyzed at the input and
output ports. Individual elements of the model are not
determined by parameter measurement. The elements
are determined by the overall performance of the lumped
element model compared to the measurements of the
component.
xxxxVS Series
Lumped Element Modeling Method
The models were created by matching a simulation model
as closely as possible to a 1-port measurement of a typical
inductor using an impedance analyzer. The model was
then used to create the final 2-port s-parameters. This
method results in a model that represents as closely as
possible the typical frequency-dependent behavior of the
component within the specified frequency limits.
Because our simulation models were used to generate our 2-port s‑parameters, they give identical results
with the same number of simulation frequency points.
The simulation models are available on our web site at
http://www.coilcraft.com/models.cfm.
Disclaimer
Coilcraft makes every attempt to provide accurate measurement data and software, representative of our components, in a usable format. Coilcraft, however, disclaims
all warrants relating to the use of its data and software,
whether expressed or implied, including without limitation any implied warranties of merchantability or fitness
for a particular purpose. Coilcraft cannot and will not be
liable for any special, incidental, consequential, indirect
or similar damages occurring with the use of the data
and/or software.
The value of the frequency-dependent variable resistor
RVAR relates to the skin effect and is calculated from:
RVAR = k ×
f
•k is shown for each value in the accompanying table.
•f is the frequency in Hz
US +1-847-639-6400 [email protected]
UK +44-1236-730595 [email protected]
Taiwan +886-2-2264 3646 [email protected]
China +86-21-6218 8074 [email protected]
Singapore + 65-6484 8412 [email protected]
Document 1144-1 Revised 08/15/13
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.
Document 1144-2
SPICE Model for Coilcraft xxxxVS Series Air Core Inductors
Frequency limit
of model (MHz)
Part number
Lower Upper
R1 (Ohm) R2 (Ohm)
C(pF)
Z0 (Ohm) EL (Deg.) F0 (MHz)
k
1010VS-23N 1
1200
158.00.02850.104 98.01.9723.8
1.06E-05
1010VS-46N
1 700 10.48 0.0015 1.231 187.5 1.97 22.91.62E-05
1010VS-79N
1 700 10.48 0.0020 1.281 303.5 1.97 22.92.38E-05
1010VS-111
1 420 76.28 0.0026 0.574 192.0 1.97 10.03.07E-05
1010VS-141
1 400 45.38 0.0030 0.874 258.0 1.97 10.04.44E-05
1212VS-22N
11200 11.84 0.0111 0.938 99.0 1.97 23.86.03E-06
1212VS-42N
1 700 17.60 0.0007 1.388 182.0 1.97 23.89.33E-06
1212VS-66N
1 600 16.80 0.0009 1.548 287.0 1.97 23.81.44E-05
1212VS-90N
1 520 14.40 0.0013 1.708 390.0 1.97 23.82.18E-05
1212VS-111
1 480 23.00 0.0012 1.488 490.0 1.97 23.52.87E-05
2014VS-33N
1 800 48.14 0.0007 1.308 142.0 1.97 23.87.47E-06
2014VS-66N
1 550 14.77 0.0007 3.048 270.0 1.97 23.81.29E-05
2014VS-111
1 480 7.80 0.0188 2.278 434.0 1.97 23.51.87E-05
2014VS-151
1 400 9.30 0.0015 2.578 602.0 1.97 23.52.95E-05
2014VS-201
1 330 10.60 0.0017 2.128 824.0 1.97 23.54.22E-05
2014VS-251
1 240 30.98 0.0020 1.888 420.0 1.97 10.03.80E-05
US +1-847-639-6400 [email protected]
UK +44-1236-730595 [email protected]
Taiwan +886-2-2264 3646 [email protected]
China +86-21-6218 8074 [email protected]
Singapore + 65-6484 8412 [email protected]
Document 1144-2 Revised 08/15/13
© Coilcraft Inc. 2013
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specification subject to change without notice.
Please check web site for latest information.