S-parameter to SPICE Model Converter
EMtoSPICE™, S-parameter to SPICE Model Converter
EMtoSPICE converts S-parameters to SPICE models with unprecedented accuracy and bandwidth at a touch of a button.
EMtoSPICE allows S-parameter simulation in time or frequency domain in any SPICE compatible simulator.
For more information about this product, visit
EMWonder's home page.
About S-parameters
What are S-parameters?
The reflection and transimission coefficients based on incident and reflection waves, as opposed to voltages and currents, are called scattering parameters or S-parameters.
At microwave frequencies, it is difficult to measure total voltages and currents at the ports of a network. S-parameter is the most accurate representation of broadband frequency behavior.
S, Y, Z-parameter conversion
The most available resources for parameter conversion are limited to two ports only.
The following equations will work for any number of ports. (They are not limited to two ports.)
| |
[S] |
[Y] |
[Z] |
| [S] |
[S] = [S] |
[S] = (Yo[I]+[Y])^(-1) (Yo[I]-[Y]) |
[S] = ([Z]+Zo[I])^(-1) ([Z]-Zo[I]) |
| [Y] |
[Y] = Yo ([I]+[S])^(-1) ([I]-[S]) |
[Y] = [Y] |
[Y] = [Z]^(-1) |
| [Z] |
[Z] = Zo ([I]-[S])^(-1) ([S]+[I]) |
[Z] = [Y]^(-1) |
[Z] = [Z] |
where Yo=1/Zo.
Note that [I] is identity matrix. For example, [1 0 0; 0 1 0; 0 0 1] in case of 3 ports.
Vendors that provide S-parameters of their products
Coilcraft®
http://www.coilcraft.com/models.cfm
- S-parameter files of RF inductors, power inductors, spring inductors and LC filters.
Infineon Technologies
http://www.infineon.com/cgi/ecrm.dll/ecrm/scripts/prod_ov.jsp?oid=13759
Johanson Technology
http://www.johansontechnology.com/library/awr/
- S-parameter files of RF components, RF capacitors and RF inductors.
Maxim
http://www.maxim-ic.com/tools/s_parameters/
- S-parameter files for their parts.
Merrimac Industries
http://www.maxim-ic.com/tools/s_parameters/
- S-parameter data for Merrimac's filters.
Mini-Circuits®
http://www.minicircuits.com/sparameters.html
- S-parameter data of amplifiers, attenuators and filters.
Modelithics™
http://www.modelithics.com/vendor_models/Vishay.shtml
- Modelithics models for Vishay components. Registration required.
muRata
http://www.murata.co.jp/sparameter/
- S-parameter files of their capacitors and chip inductors. Software that calculates S-parameters of their products.
NEC Compound Semiconductor Devices
http://www.csd-nec.com/microwave/english/spi_body.html
- S-parameter files of IC and descrete parts.
RF Micro Devices®
http://www.rfmd.com/sparameters.asp
- S-parameters of RF amplifier products
Pacific Wireless
http://www.pacwireless.com/support/s_parameter.shtml
- S-parameter files of mixer/buffer and IF amps.
SHF Communication Technologies AG
http://www.shf-communication.de/sdata.htm
- S-parameter files for their broadband amplifiers.
Taiyo Yuden
http://www.t-yuden.com/simtools/index.cfm
- S-parameters of capacitors, inductors, ferrite beads, ferrite bead arrays.
TDK®
http://www.tdk.co.jp/tebcb01/
- S-parameter files of inductors, capacitors, chip-beads and filters.
Teledyne Relays
http://www.teledynerelays.com/electroprod.asp
- S-parameters in EXCEL files for RF and electromechanical relays.
Toshiba
http://www.semicon.toshiba.co.jp/eng/prd/hfreq/spara/spara.html
- S-parameter files of BJT's and MOSFET's.
World Products
http://www.worldproducts.com/WirelessSParameters.htm
Würth Elektronik
http://www.wuerth-elektronik.de/we_web/frames,LA,FR,KA,347.php
- S-parameters of Würth Elektronik proudcts.
Other Useful Links
Smith Chart in Excel
Click
HERE to learn how to plot S-parameters in Smith Chart using Excel. Information provided by
RF Cafe, a unique portal of RF, microwave, wireless, and other engineering resources.
To report any errors or broken links, contact
Thank you.
Disclaimer: All trademarks and registered trade marks are the property of their respective owners.
