SYMICA FE: A Custom IC Design Toolkit


A free development suite for the design and simulation of integrated circuits, Symica FE is designed for engineers looking to get started with developing integrated circuits

Anagha P.

Symica is a robust platform for development of integrated circuits as it comes with all the major functions required for their successful design and simulation. Schematic editor, SPICE simulator, waveform viewer and analyser and other additional features, such as library manager, symbol editor, hierarchy editor and input and output translators, are all integrated into this single environment.

Fig. 1: Main window of Symica FE

This design suite allows the user to manage the operation of multiple elements. It also facilitates in preparation of simulation, its execution and the inspection and interpretation of simulation results. Symica lets the user enter the schematics quickly and easily. It smoothly handles complex mixed-mode and multi-voltage projects.

The simplicity of user interface, large set of features, flexibility of the simulation environment, compatibility with industry standards and high quality at no cost (or affordable cost, depending on the type of licence) make Symica an attractive solution for independent researchers, universities, startups and small or mid-sized semiconductor firms.

Features and functionalities
Symica is a straight-forward tool that can compile and simulate Verilog-A behavioural models. It has an intuitive and easy-to-use schematic capture. This free version allows the user to execute SPICE simulation for up to 300 elements.

Fig. 2: Use-friendly GUI
Fig. 2: Use-friendly GUI
Fig. 3: Waveform viewer and analyser, SymProbe
Fig. 3: Waveform viewer and analyser, SymProbe

It supports mixed-mode design and has the ability to select multiple views, namely, schematic, symbol, config, Verilog-A, functional (Verilog HDL) and spicenl (SPICE-netlist). It has commonly used design structure with hierarchical navigation, organised around libraries, cells and cell views.

Other important features are the ability to create parametric cells, support for global nets, buses and bundles, enhanced metafile format schematic output for enhanced printing functionality and options for autowiring and on-canvas editing of element properties.

The free edition of Symica has almost the same functionalities as the full version, with just a limit to the number of devices that can be simulated and lack of support for mixed signals.

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The latest beta version release of Symica also has certain added features.

Component description format helps the user specify the component occurrence in a netlist and allows him/her to create different netlists for different formats such as SPICE and LVS.

The feature, probing currents for subcircuit output pins, allows probing currents for complex transistor models that are represented as subcircuits. Two modes of probing were realised, direct plot was elaborated and hierarchical nets highlights have been added to this version.

Another useful feature introduced was the ability to share a project amongst multiple users. This is particularly favourable amongst design teams spread across different geographies. One can also choose the views that would be made available to each user.

Easy to use yet packed with guides
The user interface of Symica is simple and intuitive, and similar to that of the IC design toolkits provided by the top EDA tools for IC design and simulation. The Symica package comes with extensive help files, which are automatically made available with software installation.

There are six help guides available with installation, one for each of the six products (Symica DE, SymSpice, SymProbe, Symbol Wizard, SKILL Translator and SymLayout) in the Symica toolkit. Help files can be accessed from the toolbar, Help > Symica Help.

From the dropdown menu, select the help guide you want to view. These PDFs give a detailed explanation of their respective functions and procedures, hence making the software simple even for users with only basic knowledge of SPICE.

Build your first system on chip
The main fields of application for Symica tools are chip design, verification and testing of large circuits and systems on chips (SoCs), and post layout circuit simulation. The chip design includes multi-bit and high-speed analogue circuits that require long test sequences, projects with mixed signal analogue-to-digital conversion, large digital circuits that require analogue simulation for reaching peak performance and all kinds of analogue IPs.

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Symica has a silicon-proven technology. Hundreds of chips are already designed and manufactured using Symica tools, including analogue-to-digital (ADC) and digital-to-analogue converters (DAC), phase locked loops (PLL) and high-speed controllers. Numerous circuits have been simulated with SymSpice with around two thousand of these being used for regression testing on each new SymSpice version.

Competing tools from the big three
Symica is a Ukraine-based electronic design automation (EDA) company that was founded in 2009. The Symica DE provided by this startup has competitors that include the big three in the EDA industry—Synopsys, Cadence and Mentor Graphics.

HSPICE by Synopsys, Spectre Circuit Simulator by Cadence, Pyxis Custom IC Solution of Mentor Graphics, Analogue/Mixed-Signal/RF and Custom IC CAD by Silvaco, Quite Universal Circuit Simulator (Qucs) and Ngspice are a few other EDA tools similar to Symica from the technology point of view.

Why Symica
The main advantage of Symica over its full-featured competitors would be its pricing factor. While the cost of buying a custom IC design suite can be pretty high, the Symica FE is available for free. For additional functionalities, such as support for mixed signal features, unlimited number of devices, threads and Verilog-A model parameters, full version of Symica can be purchased at an affordable and flexible pricing scheme.


Fig. 4: Symica supports Verilog-A models

Though Qucs and Ngspice are open source projects, they are not straight-forward for compiling and simulating the Verilog-A models. Regardless of the zero or low pricing, Symica offers the user with easy user interface, high performance, high accuracy, advanced features and industry standards comparable to other top-notch tools.

Compatibility with industry standards
Symica is compatible with the industry-standard formats (HSPICE and Spectre) for netlists, models and analysis features. It allows for the import of SKILL format files (file extension *.il) of Cadence Design System, Inc. Accuracy for critical analogue circuits is achieved using a set of numerical methods and models that produce results similar to those of industry-proven standards. The software is available for both Linux and Windows platforms.

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Technical support
An updated version of the software is published every few months. Visit the company’s website to request a trial version or order a full package of this software. Technical support can be obtained from the website for licenced users. You can also send an e-mail to

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Want to help Symica beta test. You can be a beta tester by contacting them via e-mail. Symica services are also available on social networking services such as Twitter ( and LinkedIn ( Users can register on the company’s website with their e-mail IDs to receive monthly SYMICA custom IC design toolkit newsletter in their inbox.

Cadre Design Systems is the sales partner of Symica in India. You can visit their website or send an e-mail to for support.

The software provided with the DVD is Symica Free Edition (Symica FE). This is licenced for personal, noncommercial and nonprofit use, and is intended for research and educational purpose.

Free edition can simulate only up to 300 devices, 10 Verilog-A model parameters and does not offer support for mixed signal features. But this edition does not require any registration and can even be downloaded directly from their site.

Academic licence is available for universities and other educational institutions. Basic, AMS or full licence should be obtained for other commercial uses. A 30-day trial license is also available.

Download software: click here

The author is a technical correspondent at EFY


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