Cadence Academic Network Lead Institution

IMMS GmbH is Lead Institution in the Cadence Academic Network.
In 1998 the IMMS was the first AT-Institute (institute at the university) of the TU Ilmenau. The relation to the TU Ilmenau is of strategic importance for the Institute. More than 30 students are annually integrated in research and development tasks of the IMMS. In addition the scientific employees of the Institute give lectures and hold seminaries at the faculties of the university.
Prof. Ralf Sommer is manager of Department Electronic Circuits and Systems at Faculty of Electrical Engineering and Information Technology of Ilmenau University of Technology and Scientific Managing Director of IMMS GmbH.
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We use Cadence Tools at Ilmenau University of Technology
Department Electronic Circuits and Systems

Research and education in the department “Electronic Circuits and Systems“ is mainly directed on design of technical systems in the area of the information and communication technologies. Hence, the spectrum of lectures covers an in-depth introduction to digital and analog circuits and systems that form the underlying knowledge and methods for every circuit designer. This will enable him/her to handle the different tasks of the very complex design flow starting from the specification and ending with the circuit or system on transistor or layout level. Central topic is design methodology and design technology, which cover modern design tools for EDA (electronic design automation), their backgrounds and application methodology but also circuit theory and the knowledge of the different topologies and their characteristics.

Thus, complex software systems to develop innovative integrated analog circuits or design strategies are part of the research activities.

The students will acquire knowledge and abilities in state-of-the-art methods and tools (e.g. Cadence, MunEDA, Analog Insydes) in circuit and system design for analog/mixed-signal and digital applications driven by challenges arising from industrial design tasks.

All interested students from electrical engineering but also biomedical engineering, computer science, applied physics, mechatronics, mathematics are welcome to contribute to the research topics with their bachelor and master theses or as student workers.


Lectures, seminars, exercises and traineeships are offered for all students of electrical engineering and information technology, mechatronics, biomedical technology, media technology, applied physics, as well as for economy engineering - deepening electrical systems:

  • Introduction to analog electronic circuit analysis and design
  • Synthesis of digital circuits
  • Design of integrated systems 1 and 2
  • ASICs, PLD design
  • Embedded systems/microcontroller
  • Integrated analog circuit and system design
  • Integrated analog CMOS circuit design
  • Computer-aided design and analysis methodology (EDA) for analog/mixed-signal circuits
  • Embedded C and C++
  • Hardware description languages
  • Hardware design
  • Digital integrated systems
  • Lab: information electronics

Computer Aided Design Methodology and EDA for analog / mixed-signal circuits

Lecturer: Univ-Prof. Dr.-Ing. Ralf Sommer

Introduction to circuit simulation

  • History, simulation types, fields of application

Network theory as a basis for the automated setup of circuit equations

  • Kirchhoff equations, linear elements, relationships
  • Sparce tableau analysis (STA)
  • Orthogonality of the Kirchhoff equations, loop currents and nodal potentials
  • Loop-current analysis, RLA
  • Nodal analysis (NA), Super Nodal Analysis (SNA)
  • Modified nodal analysis (MNA)
  • Cuts and fundamental cutsets
  • Automatic tree and loop search and automated STA

Solving linear equations (LU decomposition, pivoting, Makrowitz reordering, sparse matrix techniques)
Solution of nonlinear equations

  • Newton-Raphson method
  • Implementation of the Newton method (Newton-equivalent circuits, convergence acceleration, simulation control)

Solution of differential equations

  • Numerical integration methods (forward and backward Euler, trapezoidal rule, multistep methods, Runge-Kutta and Gear, predictor-corrector method, exactness constraints to construct new integration methods, step size control and Nordsiek vector)
  • Convergence of numerical integration methods, stability
  • Option and control parameters

SPICE device models

  • Diode, bipolar transistor, MOS models and their parameters

Behavior modeling - solving behavior models
Symbolic Analysis

  • Symbolic analysis and analysis programs
  • Symbolic approximation algorithms (SAG SBG, SDG)
  • Symbolic extraction of poles and zeros
  • Automated behavioral model generation
  • Automatic setup of equations for nonlinear dynamic systems
  • Automated approximation of symbolic DAE systems

Statistical analysis and Entwurfszentrierung / Yield Optimization

  • Introduction to statistics - Basic concepts of statistics of device variations
  • Automatic dimensioning or sizing (numeric)
  • Automatic design-constraints generation, feasibility optimization, nominal optimization, Monte Carlo analysis, contributor identification, worst-case distance optimization (yield optimization)

Overview of the statistical device modeling
Overview Device aging and aging simulation (Cadence ReIXpert)
RF simulation methods (Cadence SpectreRF)

  • PSS - Periodic Steady State
  • PAC - Periodic Alternating-Current
  • PXF - Periodic Transfer Function
  • PNOISE - Periodic Noise
  • PDISTO - Periodic Distortion
  • QPSS - Non-Linear Quasi-Periodic Steady State
  • QPNoise - Quasi-Periodic Noise
  • HB - Harmonic Balance


  • Overview of industrial design flow, Cadence Design Framework II
  • Design Kits (Cadence Methodology Kits)
  • Practical work with the Cadence framework, WiCkeD and Analog Insydes

CMOS Analog Circuit Design

Lecturer: Dipl.-Ing. Dominik Krausse

  • CMOS basic circuits
  • Current mirrors
  • Operational amplifier circuits
    • Structure recognition
    • Analysis (DC)
  • Dimensioning/sizing strategies
  • Compensation
    • Analysis (AC)
    • Miller / PZ compensation
  • Comparators
  • Bias circuits (bandgap, PTAT)
  • Mixers, oscillators
  • ADC, PLL

Fundamentals of Circuit Design

Lecturer: Univ.-Prof. Dr.-Ing. Ralf Sommer

  • Procedures and mathematical foundations of network theory for the analysis of electrical circuits (time, frequency, stability, network elements, including nullor-, super nodal and reduced loop analysis, SNA and RLA), particularly with controlled sources
  • Ideal operational amplifiers and circuits using operational amplifiers
  • Basic transistor circuits (device characteristics, DC models, operating point models, Bipolar, MOS, small-signal equivalent circuits) for transistors
  • Multi-stage amplifiers
  • Basic circuits of the integrated circuit technology (differential stage, current mirrors, cascode, real op-amp circuits)
  • Computer-aided analysis with PSpice and symbolic analysis (Analog Insydes)
  • Selected industrial circuits and their problems (stability, compensation)

Analog Circuit Design

Modeling and simulation of analog circuits

Lecturer: Dr.-Ing. E. Hennig, IMMS GmbH Erfurt Division

  • Fundamentals of model-based design
  • Terms: system, model, simulation
  • Behavioral modeling languages (VHDL-AMS)
  • Modeling of heterogeneous systems
  • Systematic Modeling
  • Mathematical Foundations of System Specification and Simulation
  • Examples (PLL, control networks, mechatronics, ADC)
  • Component Modeling

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