[Lecture 13-16] supplementary by Prof. Kim

Prof. Kwantae Kim, Analog Integrated Circuits at Aalto University, recorded additional videos that cover walkthroughs of the CAD exercises in his Integrated Analog Systems course. These videos should provide useful guidance for ADC design simulation and verification practice! 

• Integrated Analog Systems D - Lecture 13S CAD (Bootstrapped Sampling Switch)
  https://www.youtube.com/watch?v=VSDzmijax3c
• Integrated Analog Systems D - Lecture 14S CAD (Linearity and FFT)
  https://www.youtube.com/watch?v=qwJ_tlZTaq8
• Integrated Analog Systems D - Lecture 15S CAD (Transient Noise and VerilogA Modeling)
  https://www.youtube.com/watch?v=YW2nnI3DD_c
• Integrated Analog Systems D - Lecture 16S CAD (ADC ENOB Verification)
  https://www.youtube.com/watch?v=BIFXidfTYxE

Visit also webpage: https://kwantaekim.github.io

[PDF Book] FreeCAD Manual

 

FreeCAD Manual - PDF Book by Yorik Van Harve

The Savvy Engineer Academy

May 9, 2026

Reading the FreeCAD Manual is one of the best ways to build a strong foundation in FreeCAD and improve your overall design skills. While video tutorials and quick guides can help with basic tasks, a complete manual provides structured knowledge that helps you understand the software more deeply and use it more effectively.

For students, hobbyists, and future engineers, the manual provides a solid learning path that supports long-term growth. Since FreeCAD is widely used for 3D printing, mechanical design, and open-source engineering projects, mastering it can also open new opportunities for creativity and technical development.

Overall, reading the FreeCAD Manual gives you the knowledge, efficiency, and confidence needed to create professional-quality designs successfully. CLICK HERE to Download this Book!

[QEMU 11.0] Brings New RISC-V Extensions, Fixes

QEMU 11.0 Brings New RISC-V Extensions and Fixes

The latest release of the QEMU emulator, version 11.0, is out and brings with it support for the RISC-V Zilsd, Zclsd, Zalasr, and Smpmpmt extensions, plus various compatibility and security fixes.

“We’d like to announce the availability of the QEMU 11.0.0 release. This release contains 2500+ commits from 237 authors,” the project maintainers write of the new release. “Thank you to everybody who contributed to this release, whether that was by writing code, reporting bugs, improving documentation, testing, or providing the project with CI resources. We couldn’t do these without you!”

The latest QEMU release brings with it support for four new extensions to the free and open RISC-V instruction set architecture: Zilsd and Zclsd, RV32-exclusive extensions to add register pair load and store instructions by reusing existing RV64-only instruction encodings; Zalasr, an atomic load-acquire store-release extension; and Smpmpmt, which provides a memory attribute control mechanism analogous to the RV64-only Rvpmt using PMP registers.

The full changelog is available on the QEMU wiki; releases are available on the project website, with full source code available on GitLab under the reciprocal GNU General Public Licence 2 or later.

Copyright © 2026 The Free and Open Source Silicon Foundation C.I.C., All rights reserved.

 

The Free and Open Source Silicon Foundation C.I.C.

Unit C5 Tenterfields Business Park

Halifax, HX2 6EQ

United Kingdom

[paper] FDSOI Based Cryogenic Circuit

Tapas Dutta, Fikru Adamu-Lema, Djamel Bensouiah, German Cherstvov, Plamen Asenov,

and Asen Asenov

FDSOI Based Cryogenic Circuit Performance Enhancement 

Using Back Biasing and Threshold Voltage Engineering

IEEE Journal of the Electron Devices Society (2026)

DOI 10.1109/JEDS.2026.3691285

Device  Modelling  Group,  University of Glasgow, UK
Pramana  Modelling  Labs,  Glasgow, UK
School of  Engineering,  University of Glasgow, UK
Semiwise  Ltd.,  Glasgow, UK

Synopsys,  Glasgow, UK

Abstract : In this work, we use predictive cryogenic spice based compact models derived using a process design kit re-centering approach for 22 nm FDSOI technology to analyze the impact of back-gate biasing on circuit performance. We focus on analysis of power-delay trade-offs while varying the supply voltage at room and cryogenic temperature (4K). We show that back-biasing is necessary to mitigate the effects of the higher threshold voltages observed at cryogenic temperature. We further show that simple “threshold voltage engineering” has the potential to provide much better performance, compared to room temperature.

Fig : IDS −VGS characteristics for different VBG going to much higher values 

than the previous sections (without applying anyVth shift).

Acknowledgement : We are grateful to GlobalFoundries for providing the 22FDX PDK and allowing us to customize it for cryogenic temperature operation. The device measurements were performed by Incize SRL, Belgium. This work was supported partially by Innovate UK funded project “Development of Cryo-CMOS to enable the next generation of scalable quantum computers” under the grant number of 10006017 and was also partially supported by Semiwise Ltd, UK.

[VACASK] device-level transient noise analysis

VACASK, a free and open-source analog circuit simulator, now does device-level transient noise analysis. As far as I know, this is a first among FOSS circuit simulators. Ngspice has had source-based transient noise for a while, but the user has to wire noise sources into the circuit by hand. In VACASK, every resistor, diode, and transistor contributes its own white (thermal and shot) and flicker (1/f) noise automatically during the transient run, the way Spectre and other commercial RF simulators do it.

Why it matters: this lets you actually see how noise shapes the behavior of oscillators, PLLs, mixers, and sampling circuits in the time domain, not just as an abstract spectral quantity.

Quick demo on an LC oscillator at fosc=245kHz:

Top: power spectral density of the output

Middle: single-sideband phase noise (SSB PSD)

Bottom: phase jitter accumulating over time

Having this in a FOSS tool opens the door for students, hobbyists, and researchers to run the same analyses that were previously gated behind five and six-figure licenses.

Árpád Bűrmen, the lead VACASK developer, would love to hear from anyone working on analog/RF simulation. 

What would you put it through first?

https://codeberg.org/arpadbuermen/VACASK

#OpenSource #AnalogDesign #CircuitSimulation #RFDesign #EDA