Active Filters Design

Course Information
TitleΣχεδίαση Ενεργών Φίλτρων / Active Filters Design
SchoolElectrical and Computer Engineering
Cycle / Level1st / Undergraduate
Teaching PeriodWinter
CoordinatorIoannis Theocharis
Course ID600001005

Programme of Study: Electrical and Computer Engineering

Registered students: 56
OrientationAttendance TypeSemesterYearECTS
ELECTRICAL ENERGYElective Courses745

Class Information
Academic Year2019 – 2020
Class PeriodWinter
Faculty Instructors
Class ID
Course Type 2016-2020
  • Scientific Area
Course Type 2011-2015
Specific Foundation / Core
Mode of Delivery
  • Face to face
Digital Course Content
The course is also offered to exchange programme students.
Language of Instruction
  • Greek (Instruction, Examination)
  • English (Instruction, Examination)
General Prerequisites
1. Analysis methods of Electrical circuits 2. Transfer functions and frequency response of linear systems 3. Principles and characteristics of Operational Amplifiers, basic configurations.
Learning Outcomes
1. Thorough investigation of the principles and methodologies involved in active filters design. 2. Understanding the methods fore zero-pole control of transfer functions for the different types of active filters. 3. Analysis and computation of the sensitivity functions of active filters, in respect to a series of factors impacting the filter frequency response. 4. Distinction of the filter architectures, as well as the merits and drawbacks of the different filter structures, in relation to the circuitry complexity of real filters and the frequency response characteristics. 5. Analysis and design of various filter types, using a series of integrated design methodologies of multiple stages. 6. Constructive combination of the analytical design of the filter modules with the circuit characteristics of the finally obtained structures. 7. Emphasis is put on the realistic implementations of filter designs via a group of projects. The objective of the projects relate to both the analytical and circuit implementations. Fulfilment of the design specifications in analytical and circuitry level is achieved using several software packages (MATLAB, Simulink, EWB, SPICE).
General Competences
  • Apply knowledge in practice
  • Retrieve, analyse and synthesise data and information, with the use of necessary technologies
  • Adapt to new situations
  • Make decisions
  • Work autonomously
  • Advance free, creative and causative thinking
Course Content (Syllabus)
Different types of analog active filters, transfer functions, frequency response, Bode diagrams. Amplitude, frequency and time scaling. Operational amplifiers (OA)- basic principles and configurations, bilinear transfer functions. First order filters- Passive and active implementations. Second order circuits (Biquads). Root locus, sensitivity functions, statistical analysis of gain sensitivities. Zero-pole control via active sources. Implementations of second order circuits with different frequency response (low-pass, high-pass, band-pass, band-rejection) using positive and negative feedback strategies. Implementations of second order transfer functions using infinite gain OAs. Generalized second order circuits and circuits with multiple OAs. Design methods of passive filters with different response characteristics. Design of low-pass active filters: Butterworth, Chebyshev, Inverse Chebyshev, Cauer, Bessel-Thomson. Frequency transformations. Band-pass filters design, zero-pole transformations, Geffe algorithm. Design of high-pass, band-rejection active filters. Design of Bessel-Thomson active filters, phase and signal delay, transfer functions and frequency response of delay filters. Active filter designs incorporating generalized impedance converters (GICs) and switching capacitors (SC).
Educational Material Types
  • Notes
  • Slide presentations
  • Book
Use of Information and Communication Technologies
Use of ICT
  • Use of ICT in Communication with Students
Course Organization
Written assigments301
Student Assessment
The final grade is a weighted average obtained from the assessment of mandatory (5) projects and the oral examination of the project reports.
Student Assessment methods
  • Written Assignment (Summative)
  • Report (Summative)
Course Bibliography (Eudoxus)
1. Αναλογικά Φίλτρα, Σπύρος Α. Πακτίτης, Εκδόσεις Ίων (4η έκδοση 2007) ΑΘΗΝΑ, ISBN: 978 – 960 – 411 – 641 – 6, ΚΩΔ.ΕΥΔ.: 14454 2. “Analog Filter Design” [Hardcover] by M. E. Van Valkenburg, Oxford University Press, USA, ISBN-10: 0195107349, 1995. 3. “Design of Analog Filters”, by Rolf Schaumann and Mac E. Van Valkenburg, Oxford University Press, USA, ISBN-10: 0195118774, 2001.
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