ADMS

For the Australian research centre ADM+S, see ARC Centre of Excellence for Automated Decision-Making and Society.

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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

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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

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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).

## See also

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* Verilog-A
* SPICE

## References

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1. ^ Sergey Sukharev (24 March 2006). "New enhancements in ADMS and Spectre CMI XML scripts" (PDF). mos-ak.org. Retrieved 9 April 2023.
2. ^ Transistor model#Models for circuit design .28compact models.29
3. ^ "Tutorial". Archived from the original on 28 September 2013. Retrieved 9 January 2014.
4. ^ "Compact device modeling using Verilog-AMS and ADMS" (PDF). Archived from the original (PDF) on 4 March 2016. Retrieved 27 April 2015.
5. ^ "Ngspice circuit simulator - adms".
6. ^ "Ngspice circuit simulator - adms and ngspice HOWTO". ngspice.sourceforge.io. Retrieved 9 April 2023.

## External links

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* EKV MOSFET Model: Industry Standard Model for Analog/RF IC (2007)
* adms (download)
* A Platform for Compact Model Sharing! (A project started in 2011)
* The i-MOS Project: An Open Platform for Device Modeling and Circuit Simulation (archived 2014)