Analog Signal Processing and Filtering 2023

Wiki start address:

User Name and Password for downloading documents from this web site are available from the maintainer (see signature below). I will require some sort of proof that you are a student associated with a Swiss unversity, for example a Legi-Nummer.


The lectures base on handwritten notes and a few research papers as a base.

Further reading

The text book "Analog Integrated Circuit Design" by Carusone/Johns/Martin is not essential, but can help for further reading if you are particularly interested in the microelectronics aspects of this lecture. The book is normally VERY expensive, but if you buy it in the right place, you can get it at a reasonable price. At the moment of writing this entry the best place I know is here: Hugendubel.

Required tools

I am moving towards having all scripts in Python (sympy, numpy, scipy). I will also provide you with the application "signalflowgrapher", a newly developed Python application that is open source.

Live Stream

I will teach in the room CHN E42. I will live-stream everything to my Zoom Room (link will be sent to registered students by E-Mail) and record all lectures. I will upload all videos to for long-term storage; this requires a SwitchAAI login.

Information on Signal-flow Graphs

There is also a page with links to a video channel and papers that is open to the public.

This year's programme





Introduction, Poles and Zeros, Driving-Point Signal-Flow Graphs


Gm-C Filters from a signal-flow point of view


OpAmp-RC Filters


Signal-Flow-Graph Video Course

Home study


Current-Mirror OTA, output with cascodes, Miller effect


Inductor simulation, impedance converters, and LC filter simulation


Current conveyors, current-feedback opamps and how to build filters with them


Specification and quality of signal processing circuits: noise, flicker noise, power, harmonic distortion, PSR, CMR, HD, IMD, SNR, SNDR, SFDR, and figures of Merit


SC Filters 1: Introduction and SC amplifiers


SC Filters 2: SFG analysis of an SC filter stage


SC Filters 3: SAR ADC and noise in SC filters

new topic


Sigma-delta converter fundamentals, loops, stability etc.


Higher-order sigma-delta converters


Sigma-Delta PWM for class-D audio and other Sigma-delta tricks

with holiday special :)

Not in this year's programme


The oral exam has three phases:

  1. The student is asked with which topic she or he wants to start, and then gets a simple question to start with. In this phase, the examiner asks questions to test how well the student knows the chosen topic. If this phase is done well, a '4' is guaranteed.
  2. In this phase, the examiner lets the student make links from the chosen topic to other topics from the course. If this phase is done well, a '5' is given.
  3. In this last phase, the examiner asks questions to which the student cannot have an answer. If the student makes good solution attempts using the material from the course, a '6' is given.

If possible, the examiner announces the phase changes.

A student asked what would constitute a topic, this is the response: The scope of the chosen topic is up to you (of course it must be a topic from the lecture). Choose it so you can show in sufficient detail your knowledge about it. For example some people chose to talk about sigma-delta converters including noise shaping of different order, which worked out well for them. You could also pick out some detail (e.g. the "gain" in a sigma-delta converter or a particular interesting circuit for the application of Mason's rule) and go more in depth. What you probably shouldn't do is try to argue about why it should be called delta-sigma instead of sigma-delta for ten minutes, and you also shouldn't try to summarize the whole lecture. Brownie points for any topic we don't hear more than once. One approach is to take something that sparked your interest during the lecture and prepare it in detail. If you are interested in what you are talking about, it's likely that we will be, too. Misjudging the scope has not been a problem in the past. Use common sense. And use signal flow. It is not an option to not learn to use signal-flow graphs.


All questions about this page should be directed by E-Mail toHanspeter Schmid.

For everything administrative, copies of exercises, and lecture notes, you can reach the assistant Hampus Malmberg through E-mail,, or in the room ETF D109.3.


University of Applied Sciences and Arts Northwestern Switzerland
School of Engineering
Institute of Microelectronics

Prof. Dr. Hanspeter Schmid
Professor for Analog Microelectronics
Klosterzelgstrasse 2 (1.225)
CH-5210 Windisch
T +41 56 202 75 34

ASF WIKI (last edited 2023-11-15 08:09:31 by haschmid)