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.
7-419: ADMS stands for Automatic Device Model Synthesizer. ADMS can be used to turn Verilog-A compact models into C code. ADMS interpreter parses a Verilog-AMS file to build a data tree. 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
14-582: A conductance expression (and not impedance). i.e. I(..) <+ V(..) Some other language constructions need to be supported in the filter as well Many language features are hard to support with ADMS filters Important aspects of code generation are close to impossible with ADMS and Verilog-A Verilog-A is an industry standard modeling language for analog circuits. It is the continuous-time subset of Verilog-AMS . A few commercial applications may export MEMS designs in Verilog-A format. Verilog-A
21-566: Is part of the complete Verilog-AMS standard. Its LRM is available at the Accellera website. However, the initial and subsequent releases can be found here , with what will probably be the final release here since future work will leverage the new net-type capabilities in SystemVerilog . Built-in types like "wreal" in Verilog-AMS will become user-defined types in SystemVerilog more in line with
28-713: The VHDL methodology. A subset of Verilog-A can be translated automatically to the C programming language using the Automatic Device Model Synthesizer (ADMS) . This feature is used for example to translate the BSIM Verilog-A transistor models, which are no more released in C, for use in simulators like ngspice . This first example gives a first demonstration of modeling in Verilog-A: This Verilog-AMS example implements an ideal diode, by defining
35-505: The vendor-neutral language Verilog-A for model definition, improving robustness and maintainability. ADMS is used by the open source SPICE simulator NGSPICE to support a number of compact models. Following models are supported by NGSPICE using ADMS: 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: Instead, this needs to be represented as
42-454: Was an all-analog subset of Verilog-AMS that was the project's first phase. There was considerable delay (possibly procrastination) between the first Verilog-A language reference manual and the full Verilog-AMS , and in that time Verilog moved to the IEEE, leaving Verilog-AMS behind at Accellera . The email log from AD 2000 can be found here . Verilog-A standard does not exist stand-alone - it
49-494: Was created to standardize the Spectre behavioral language in the face of competition from VHDL (an IEEE standard), which was absorbing analog capability from other languages (e.g. MAST). Open Verilog International (OVI, the body that originally standardized Verilog) agreed to support the standardization, provided that it was part of a plan to create Verilog-AMS — a single language covering both analog and digital design. Verilog-A
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