0:6:53 Work in industry, Siemens, Infineon, Qimonda
0:9:48 Arduino ADC, DAC
0:11:1 Trade Fairs
0:11:48 Motivation digital information
0:14:10 Plan for this lecture
0:15:2 Literature, Books
0:16:58 CMOS Analog circuit design Holberg
0:17:58 Manufacturers
0:19:22 Arduino MKR Wifi 1010
0:24:19 Minimum and maximum code and voltage
0:28:58 Sample rate
0:30:46 Arduino project documentation
0:33:28 Extension boards Digilent AD2, DA2
0:35:8 Recording the timeline, time estimation
0:36:58 Take your own notes
0:37:50 Properties of digital signals
0:38:45 Analog and digital signal
0:41:3 LSB and fs sampling frequency
0:42:48 Digital to analog converter metric
0:45:13 Example, Vref, LSB accuracy,
0:49:18 Vmax
0:51:33 Offset error, gain error
0:53:33 Offset error, gain error in graph
0:56:33
Welcome
Welcome to Interface Electronics
Get to know each other.
My background
Your background
Expectations
What is Interface Electronics?
List of participants.
List for practical training.
Lecturer
Prof. Dr.-Ing. Jörg Vollrath
Consultation: T221 Wed 10:00-10:45
Please give advanced notice via email
Joerg.vollrath@hs-kempten.de
Joerg.vollrath@ieee.org
Interface Electronics
Lecture 2 SWS: Mo 8:00 - 9:30
Laboratory 2 SWS: Mo 15:45-17:15, Wed 8:00-9:30 T314
30% Laboratory: Report
70% Exam: 90 min written Exam
Non programmable calculator
Open book
Memory Products 64M..2G Bit DRAM
Activities:
Memory test and fault diagnosis for yield enhancement
Reliability studies for product qualification
Verification of digital and analog circuits
Questions
What about you?
What is your background?
What are the challenges in a german master class?
How do you prepare for the exams?
How do you get a master thesis?
German and International Students
What are the benefits and drawbacks?
Where do you see challenges?
How can you achieve a master degree?
Challenges
Limited time
German language
Previous knowledge
Time management
Student responsibility
Written reports
Initiative
Jobs, master thesis, scientific project
Important Events
18.-21.11.2025
PRODUCTRONICA
weltleitmesse für innovative elektronikfertigung, München
electronica 10.-13.11.2026
components / systems / applications
München
embedded world Conference
10.-12.3.2026, Nürnberg, Germany
Allgäuer Hochschulmesse,
2026, Kempten
Motivation: Data converters
This is the digital age!
Everything has to be converted to the digital domain
Signal conversion is happening all the time
What about the signal quality and the error?
Understanding of data sheet and measurement
Data converters are mixed signal designs
Analog and digital circuits
Analog and digital filters
Time domain and frequency domain
Challenge of high speed, high accuracy and low power circuits
Overview
Motivation
Scaling of analog and digital circuits
Applications
DA, AD converter blocks, metrics and testing
N, Vref, Vfs, Vmax, LSB, fmax
LTSPICE: DAC, ADC model
Static and dynamic characteristics
INL, DNL, offset, gain error
Histogramm testing
Spectrum, signal to noise ratio, FFT, SNDR
DAC architectures
Resistor string DACs
Charge scaling DACs
R-2R type DACs
Current based DACs
Segmented DACs
ADC structures
Slope type converters
Successive approximation (SAR)
Flash
Pipeline
Oversampled ADCs
Challenges in data converters
References
CMOS: Circuit Design, Layout, and Simulation,
Revised Second Edition, R. Jacob Baker, Wiley,
ISBN 978-0-470-22941-5, Revised 2nd Edition, 2008.
CMOS: Mixed-Signal Circuit Design, Second Edition, Baker, Wiley 2009
Course Description EE247
Architectural and circuit level design and analysis of integrated
analog-to-digital and digital-to-analog interfaces in modern CMOS
and BiCMOS VLSI technology.
Analog-digital converters: Nyquist and over-sampled, digital-analog converters,
sample/hold amplifiers, continuous-time and switched-capacitor filters.
Low power mixed signal design techniques.
Data communication systems including interface circuitry.
CAD tools for analog design for simulation and synthesis.
Minimum value of ADC: 0
Maximum value of ADC 1021
Minimum voltage: 30 mV
Maximum voltage: 3.31 V
Sampling rate: 289.28 Hz
Analog versus digital electronic
Digital Circuits
Analog Circuits
Shrinking of transistor feature size is easy
Moores Law
Digital circuits can be easily built with CMOS transistors
Digital signals can have arbitrary precision
Automated design
Digital circuits are felxible and functions can be easily programmed
Precision needs high power, voltage or currents to control signal to noise ratio
Precision needs large transistors with well controlled geometry
Carefully handcrafted design
Analog circuits are very specialized for a certain function
More and more circuits are realized with digital circuits.
Analog circuits are getting more convenient for user and more complex for designer.
Digital offset and gain adjustment and digital filters for compensation.
Properties of digital signals
Properties:
Resolution
Frequency
Power consumption
Price
Architecture, type
Power supply voltage
Input range
Manufacturing process feature size
The green analog curve is discretized in time and level resulting in the red points.
The smallest difference in level is called delta Δ or LSB (least significant bit).
The smallest difference in time is called sampling time (ts).
Data converter application
A graph with x axis resolution and y axis frequency shows applications.
Data converter application: software defined radio SDR
A tuneable filter provides a limited bandwidth to an ADC.
The radio protocol (WiFi, Bluetooth, FM, AM, digital-TV,LTE)
is realized in the digital signal processing block.
Data converter application: Mobile phone
Filters
Number of data converters:
HSDP, LTE, UMTS, WLAN, bluetooth
motion, pressure, proximity sensor
speaker, microphone
display control
Digital to analog converter metric
N inputs:
digital signals D0..DN-1
for simplicity representing positive binary numbers 0..(2N-1)
D0 is the least significant bit LSB
DN-1 is the most significant bit MSB
Analog output signal:
for simplicity voltage
Current and range can be adjusted by additional
analog circuits (amplifier, level shifter).
Metrics:
N: number of Bits
Vref: reference voltage
Vmax=VFS: maximum, full scale voltage
Δ , LSB minimum step size