18-11-2025: MOS modeling

18-11-2025: MOS modeling#

Lecture: EE4109-3

Location: Hall Ampere (36.HB.01.670)

Time: 15:45 - 17:30

color coded resistors

MOS EKV Model#

  • All-regions nonlinear dynamic model

  • Active forward region small-signal and stationary noise model

MOS EKV model

IC manyfacturers often provide BSIM model parameters for CMOS devices. BSIM models are optimized for simulation speed and stability. Many parameters of these models have no direct relation to underlying physical mechanisms.

The EKV model shows a strong relation with the physical operation of the device. With the aid of this model it is possible to relate the small-signal parameters of the hybrid-pi model to the device geometry parameters, a small number of technology parameters and the inversion coefficient. This makes it a design-friendly model.

SLiCAP uses the EKV model to relate the small-signal device parameters to the device geometry, the technology and the operating conditions.

Presentation

The presentation EKV model briefly introduces this model.

Downloads

"SLiCAP_python_mosEKVplots.zip"

Video

EE4109 2020 2_3 MOS EKV Model

Study

Chapter 4.4.7, 4.5 (except 4.5.3)

MOS EKV model

The inversion coefficient is an important measure for the operating conditions of a modern short channel MOS. Many important performance measures show a strong relation with the inversion coefficient.

Presentation

The presentation Application of the EKV model illustrates the use of the inversion coefficient as design parameter.

Video

EE4109 2020 2_5 Application of MOS EKV Model

Study

Chapter 4.4.7, 4.5 (except 4.5.3)

Poster#

MOS modeling and design poster

Software installation and group exercises#

  1. Please install ngspice

  2. Please install KiCAD

  3. Please install Python 3.12 or higher including Jupyter Notebook; if you do not have python under MSWindows, please install Anaconda

  4. Please install SLiCAP 4.0.7

    >>> pip install slicap

    or if you have a previous version installed:

    >>> pip install slicap --upgrade

  5. Please clone or download SLiCAP examples

  6. Learn SLiCAP by running and studying the example myFirstRCnetwork

  7. Download: MOS_EKV_BSIM.zip

  8. The notebooks NMOS_lookup.ipynb and PMOS_lookup.ipynb show you how to extract small-signal parameters of an NMOS or PMOS in an operating point.

  9. The script MOS_EKV_BSIM.py shows you how to compare the SLiCAP small signal EKV-based MOS model parameters with those obtained from SPICE.

  10. Download: MOSparams.zip

Contents