Analog Filter Design
FEKT-KELFAcad. year: 2018/2019
At present, the analog filters become inseparable parts of any complex electronic device. Thus its analysis and design process belongs to the basic bachelor capabilities. This group covers passive filters, active structures, filters which utilize unconventional physical principles (SAW, crystal filters) as well as filters based on some switching mechanism (switched capacitors). From the viewpoint of practical application we are speaking about electronic systems which are able to process signals with frequencies up to 100MHz. In exercises students solve problems of computer-aided analysis and design of the typical filter topologies by using available software (Orcad Pspice, Snap, FilterCAD, Filter Solution, NAF) including filter optimization from different viewpoints.
Learning outcomes of the course unit
The graduate is able (1) understand fundamental properties of the electronic filters in time and frequency domain, (2) design of passive as well as active filter for particular application including calculation of the values of circuit elements, (3) interpret function of the crystal filters and structures with switched capacitors, (4) analyze and design of the filtering networks by using computer.
Knowledge of mathematics on secondary education level (operations with fractions, solving system of the linear equations, algebraic handling with equations) and electronics (principles of the passive elements, describe simple circuit by using differential equations) is requested.
Recommended optional programme components
Recommended or required reading
W. K. CHEN: The circuits and filters handbook. CRC Press, Florida, 2000 (EN)
L. P. HUELSMAN: Active and passive filter design. McGraw-Hill New York, 1993 (EN)
T. DOSTÁL: Elektrické filtry - počítačová cvičení. Elektronická skripta. UREL, 2004. (CS)
A. B. WILIAMS, F. J. TAYLOR: Electronic filter design handbook. McGraw-Hill New York, 1995 (EN)
K. HÁJEK, J. SADLÁČEK: Kmitočtové filtry. BEN, 2002. (CS)
Planned learning activities and teaching methods
Techning methods include lectures, computer laboratories and practical laboratories. Course is taking advantage of e-learning (Moodle) system.
Assesment methods and criteria linked to learning outcomes
Two computer exercises during semester (10 points), four individual student projects (20 points), final exam (70 points).
Language of instruction
1. Continuous-time filtering fundamentals, types of filters.
2. Transfer functions of the bilinear and biquadratic filtering sections.
3. Passive RC and RLC filters.
4. Design of the passive ladder filters using tabularized parameters.
5. Active elements used in filtering networks, active filters, topologies and cascade synthesis.
6. All-pass filters, properties and different structures.
7. Imittance converters and inverters, synthetic functional blocks, application examples.
8. Filters with switched capacitors, crystal filters, SAW filters, electromechanical conceptions.
Lectures are focused on the problems with filtration of the continuous-time signals and design of the analog filters for practical applications in different frequency bands.
Specification of controlled education, way of implementation and compensation for absences
Evaluation of activities is specified by a regulation, which is issued by the lecturer responsible for the course annually.