Software:ADMS
Automatic Device Model Synthesizer (ADMS) is public domain software used in the semiconductor industry to translate Verilog-A models into C-models which can be directly read by a number of SPICE simulators, including Spectre Circuit Simulator, Ngspice and HSpice.
Overview
ADMS stands for Automatic Device Model Synthesizer.[1] ADMS can be used to turn Verilog-A compact models[2] into C code. ADMS interpreter parses a Verilog-AMS file to build a data tree.[3] XML filters are applied on the tree to generate the output files.
ADMS aims to reduce the effort of circuit simulator developers to integrate device models - at the same time, it provides the option to compact model developers to use the vendor-neutral language Verilog-A for model definition, improving robustness and maintainability.[4]
ADMS is used by the open source SPICE simulator NGSPICE[5] to support a number of compact models. Following models are supported by NGSPICE using ADMS:[6]
- MOS EKV (LEVEL=44)
- MOS PSP102 (LEVEL=45)
- BJT Mextram 504 (LEVEL=6)
- BJT Hicum0 (LEVEL=7)
- BJT Hicum2 (LEVEL=8)
Limitations
ADMS only parses a subset of Verilog-A, and not all statements are supported by all XML filters. Specifically, current controlled voltage sources are not supported in most filters targeting SPICE simulators:
- V(..) <+ I(..) // does not work with NGSPICE
Instead, this needs to be represented as a conductance expression (and not impedance).
i.e. I(..) <+ V(..)
- I (..) probes do not work with NGSPICE
Some other language constructions need to be supported in the filter as well
- for loop,
- case statement.
Many language features are hard to support with ADMS filters
- laplace_transform,
- idt,
- switching branches.
Important aspects of code generation are close to impossible with ADMS
- dataflow analysis
- code optimisation,
and
- ADMS is extremely slow (which can be seen on slightly larger models).
References
- ↑ Sergey Sukharev (24 March 2006). "New enhancements in ADMS and Spectre CMI XML scripts". http://www.mos-ak.org/boeblingen/slides/P3_Sukharev_MOS-AK_Boeblingen.pdf.
- ↑ Transistor model
- ↑ "Tutorial". Archived from the original on 2013-09-28. https://web.archive.org/web/20130928004517/http://vacomp.noovela.com/tutorials.html. Retrieved 2014-01-09.
- ↑ "Compact device modeling using Verilog-AMS and ADMS". Archived from the original on 2016-03-04. https://web.archive.org/web/20160304060335/http://www.ite.waw.pl/etij/pdf/35-03p.pdf. Retrieved 2015-04-27.
- ↑ "Ngspice circuit simulator - adms". http://ngspice.sourceforge.net/adms.html.
- ↑ "Ngspice circuit simulator - adms and ngspice HOWTO". https://ngspice.sourceforge.io/admshowto.html. Retrieved 9 April 2023.
External links
- EKV MOSFET Model
- adms
- https://web.archive.org/web/20140109115034/http://www.techconnectworld.com/Microtech2012/pdf/WCM2012-MChan.pdf
- Home | i-MOS
- Ngspice circuit simulator - adms and ngspice HOWTO
See also
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