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Cadence Central

The ohio state university department of electrical & computer engineering cadence® university program member.

The Cadence® toolset is a complete Integrated Circuit (IC) Electronic Design Automation (EDA) system used to devlop commercial analog, digital, mixed-signal and RF ICs and circuit boards.  The toolset is utilized in in the Department of Electrical and Computer Engineering at The Ohio State University throughout the analog/mixed signal courses and is employed to create state-of-the art circuits in research labs.

Courses employing Cadence® Tools

ECE 4021 Analog Integrated Circuits I (Custom IC)

ECE 5020 Mixed Signal VLSI (Custom IC, Digital IC)

ECE 5021 Analog Integrated Circuits II (Custom IC)

ECE 5022 Radio Frequency Integrated Circuits (Custom IC)

ECE 5227 Fundamentals of Power Management Integrated Circuits for VLSI Systems (Custom IC, Verification)

ECE 7020 Integrated Circuit Design of Data Converters and Phase-Locked Loops (Custom IC, Verification)

ECE 7027 Advanced Topics in Analog VLSI Design  (Custom IC, Verification)

ECE 7022 Advanced RF Integrated Circuits (Custom IC, Verification)

ECE 7821 Mixed Signal Verification and CAD Tools (Custom IC)

Research Laboratories using Cadence®

Information Electronics

Analog VLSI

Cadence Introduction

The Cadence tools installed on the ECE machines at The Ohio State University are the same as those at most professional mixed-signal microelectronics company in the United States. These tools are used for transitor-level analog design, spice level simulation (using spectre), transistor-level layout, as well as parasitic extraction (resistive and capacitive) on a post-layout design. This design flow encompases the major portion of any IC design effort. The tools are also capable of implementing a multi-million gate digital design flow, including simulation, synthesis, and physically-knowledgable place and route. Finally, the tools integrate with other EM solvers, simulators, and verification engines to provide design capability right up through multi-GHz RF.

For each silicon process node (ie. 0.5um, 0.18um, 90nm ...) the toolset is configured via a foundry provided design kit or process design kit (PDK). This kit contains schematic symbols, simulation models, programmable layout cells (PCELLs) and verification routines for design objects available in the process node. For example, a PDK would contain schematic symbols for transistors, capacitors, and resistors available in a given technology node. It would also contain simulation models for the transistors, capacitors, and resistors that are parameterized based on physical attributes such as length and width. Simulations of a design are run by placing the symbols onto a schematic, parameterizing them appropriate to the desired function and instantiating stimulus for the design. Some PDKs allow the parameters from design schematics to be propigated to the layout, automatically sizing design elements. Verification routines check for layout rule compliance (DRC) and extract design element sizes from a layout for validation that the layout matches the schematic (LVS).

Note that without a foundry-provided design kit, no designcan be done.  Hence, provided below are instructions on how to setup an OSU ECE account for using Cadence tools, then below that are instructions on how to set up an IBM PDK, then below that are instructions on how to set up an AMS PDK and a Cadence simulations tutorial. 

Also, we strongly recommend using the directory structures/names presented in the Cadence setup instructions below.  Further, do not run Virtuoso in your root directory; the files that are created by one design kit can interfere with other ones.

The Cadence Disclaimer:

Information is provided 'as is' without warranty of any kind. No statement is made and no attempt has been made to examine the information, either with respect to operability, origin, authorship, or otherwise. Please use this information at your own risk. We recommend using it on a copy of your data to be sure you understand what it does under your conditions. Keep your master intact until you are satisfied with the use of this information within your environment.

• Cadence Links
• Cadence Design Systems
• NCSU Cadence Page
• MOSIS Service
• MOSIS Educational Program (MEP)
• MOSIS SCMOS Design Rules
• MOSIS Fabrication Schedule
• MOSIS Educational Program Technical Support
• Other Unversity Cadence Pages
• Cadence Toolset Setup
• To use Cadence , make a cadence directory (~/cadence/)
• Then source the system Cadence configuration file.
• To run generic Cadence Virtuoso at the command line, use the following commands in the cadence directory (Note: Without a process design kit, no simulation or layout can be done, so running virtuoso is pointless until a design kit has been setup):
• Make a subdirectory for work using the IBM PDK (~/cadence/IBM180nm/) mkdir ~/cadence/IBM180nm
• Then copy all of the startup files into your into your directory cp /opt/local/cadence/design_kits/IBM/IBM_CMOS/ForUsers_7rf/.cdsinit ~/cadence/IBM180nm cp /opt/local/cadence/design_kits/IBM/IBM_CMOS/ForUsers_7rf/.cdsenv ~/cadence/IBM180nm cp /opt/local/cadence/design_kits/IBM/IBM_CMOS/ForUsers_7rf/Startup.EE.614 ~/cadence/IBM180nm cp /opt/local/cadence/design_kits/IBM/IBM_CMOS/ForUsers_7rf/Startup.Calibre ~/cadence/IBM180nm cp /opt/local/cadence/design_kits/IBM/IBM_CMOS/ForUsers_7rf/cds.lib ~/cadence/IBM180nm cp /opt/local/cadence/design_kits/IBM/IBM_CMOS/ForUsers_7rf/display.drf ~/cadence/IBM180nm cp /opt/local/cadence/design_kits/IBM/IBM_CMOS/ForUsers_7rf/launch.cadence614 ~/cadence/IBM180nm
• To run virtuoso at the command line in the IBM180nm work directory (~/cadence/IBM180nm/), use the following command: source launch.cadence614 virtuoso &
• Each process will require a separate design library, because process-specific parameters are bound to the schematics and layout.
• Each design library should reflect the user's name (in some form) as well as the process being used (i.e. fisherj_ibm180nm).
• Each design library must be attached to a technology file .
• The cms7rf library is the technology file to which the design library should be attached for the IBM180nm process.

Cadence is a registered trademark of Cadence Design Systems, Inc., 2655 Seely Avenue, San Jose, CA 95134.