Coilcraft S-Parameter Data for RF Surface Mount Inductors 
Version 3.1   July, 1998   Copyright Coilcraft, Inc. 1998


    These S-Parameter data files are one port descriptions of Coilcraft
RF Surface Mount Inductors. The data files are used as "BLACK BOX"
descriptions, thus reducing the complexity in circuit modeling. The
frequency range of the data is 0.300 MHz to 6000 MHz with 401 data
points.


Why one-port models?

    Our inductors are modeled as one-port devices to increase the
accuracy of your circuit. A one-port model is able to give the most
accurate L and Q representation.
    The S-Parameter data represents the inductors as reciprocal one-port
devices with two nodes. The S1P files are not a typical one-port circuit
description. Normally, a one-port device is modeled either as a thru
(S21) or shunt (S11). Our files account for both thru and shunt,
therefore all four columns (S11, S12, S21, S22) are utilized. Although
all four S-Parameter columns are listed, these are not two-port data
files. If used as a two-port device, your circuit will show gain. 


How to use the files
    
    The chip inductor data file names have the format XXWWZZZ.S1P:
        XX  = the first two numbers of the part number of the inductors
        WW  = the style of the inductor (CS, HS, CT, HT, LS)
        ZZZ = the value of the inductance as stated on our data sheets

   For example, if you were interested in a Coilcraft 0805HT chip
inductor with an inductance of 4.7 nH, the file you would choose is
08HT4N7.S1P or if you were interested in a Coilcraft 1008CS-222 chip
inductor, you would choose 10CS222.S1P.
   The air core "spring" inductors have the full part number as their
filenames, except for the "Midi Springs". For example, you need to use a
Coilcraft "Micro Spring" 0906-4 and a Coilcraft "Midi Spring" 1812SMS-
68N, the files you would choose are 09064.S1P and 18SM68N.S1P
respectively.


S1P file description.

   The S-parameter data files are reciprocal one port (S11, S21, S12,
S22) descriptions of Coilcraft RF Surface Mount Inductors. The S-
Parameter data files are in the TouchStone(R) format. The following is a
typical data segment:

# Hz S DB R 50
0.30   -52.62 -45.93  -0.03  -0.02  -0.01  -0.02  -54.43  -12.93
0.31   -54.08  10.27  -0.02  -0.04  -0.03   0.00  -55.14  -10.22
0.33   -53.99  10.03  -0.01  -0.06  -0.02  -0.07  -53.14  -5.59
....

   The first line (header) describes the frequency units, parameter,
measurement format and characteristic impedance of the measurement
(here, 50 Ohms).

   The first column is the frequency in Hz. The next columns are S11 dB
magnitude, S11 phase (degrees), S21 dB magnitude, S21 phase, S12 dB
magnitude, S12 phase, S22 dB magnitude, S22 phase.


How to extract L values.

   In order to speed up your simulation time, only 401 data points were
measured. Therefore, we do not recommend using this data to determine or
derive exact L and Q values of our inductors.

   We do however, include a DOS program called S1PTOL.EXE to extract
inductance values at each frequency point for those that are interested.
This program creates a tab-delimited text file with two columns
(FREQUENCY and L) which can be imported into a spreadsheet for graphing.
   The easiest way to use the program is to create a directory that will
contain the extracted L data. Copy the S1PTOL.EXE program into this
directory. Change to this directory and type:

      S1PTOL.EXE Z:\PATH\FILENAME.S1P

where Z:\PATH\FILENAME.S1P is the path and filename of the appropriate
S-Parameter data file. This creates the file FILENAME.TXT in your
current directory.

   For example, if you wanted to plot the L data for a 0603CS-6N8 and
the data file is in the path C:\S1P\0603CS, you would type:

      S1PTOL.EXE C:\S1P\0603CS\06CS6N8.S1P

This will create a file called 06CS6N8.TXT in your current directory.

   If you type S1PTOL/? at the DOS prompt, you will get help
information.
	

Disclaimer

   Coilcraft makes every attempt to provide accurate measurement data
and software, representative of our components, to our customers 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.