Course detail

Electronic Filters

FEKT-BPC-ELFAcad. year: 2021/2022

Analog filters are still inseparable parts of complex electronic devices. Thus, its analysis and design process belongs to the basic application-oriented bachelor capabilities. This course covers passive and active filtering structures with traditional and unconventional functional blocks (synthetic inductors, elements known as FDNR, super-niductors), filters which utilize special physical principles (SAW, crystal filters) as well as filters based on switching mechanism (switched capacitors). From the viewpoint of practical applications we are speaking about electronic systems with accumulation elelemts which are able to process signals with frequencies up to 100MHz in real time. In computer exercises students learn how to solve problems of computer-aided analysis and design of the typical filter topologies by using available software (Orcad Pspice, Snap, NAF, Matlab, Mathcad) including filter optimization from different aspects.

Language of instruction

Czech

Number of ECTS credits

5

Mode of study

Not applicable.

Guarantor

doc. Ing. Jiří Petržela, Ph.D.

Department

Department of Radio Electronics (UREL)

Learning outcomes of the course unit

Graduate of this course:
1. understand fundamental properties of lumped electronic filters and filtering in time and frequency domain
2. can interpret arbitrary transfer function and derive corresponding frequency characteristics
3. is able to design passive as well as active filter for particular application including calculation of numerical values of all circuit elements
4. describe function of crystal and SAW filters and structures with switched capacitors
5. completely analyze and design filtering networks by using computer

Prerequisites

Knowledge of mathematics on secondary education level (operations with fractions, solving system of linear equations, algebraic handling with equations, Laplace transform) and electronics (principles of passive and basic active elements), describe simple circuit by using differential equations also belongs to required ability.

Co-requisites

Not applicable.

Planned learning activities and teaching methods

Techning methods include lectures, computer laboratories and practical laboratories. Course is taking advantage of e-learning (Moodle) system, where all study materials are stored.

Assesment methods and criteria linked to learning outcomes

Computer exercises during semester (20 points), laboratory measurement (20 bodů), written final exam (60 points).

Course curriculum

1. Continuous-time filtering fundamentals, types of frequency filters and their properties.
2. Transfer functions of bilinear filtering sections.
3. Transfer functions of biquadratic filtering sections.
4. Passive RC and RLC filters.
5. Design of passive ladder filters based on prescribed tolerance field.
6. Active elements used in filtering networks, basic concepts of active filters.
7. Gm-C topologies of filters, multifunctional filters.
8. Electronically reconfigurable filters, theory and practice.
9. All-pass filters, properties and different structures.
10. Audio filters, equalizers and filters having non-integer mathematical order.
11. Imittance converters and inverters, synthetic functional blocks, application examples.
12. Filters with switched capacitors, properties and practical applications.
13. Crystal-based filters, SAW filters and electromechanical conceptions.

Work placements

Not applicable.

Aims

Lectures are focused on the problems with filtration of the continuous-time signals and design of passive as well as active analog filters for practical applications in frequency bands up to 100 MHz.

Specification of controlled education, way of implementation and compensation for absences

Evaluation of activities is specified by regulation, which is issued by lecturer responsible for course and published annually.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

T. DOSTÁL: Elektrické filtry - počítačová cvičení. Elektronická skripta. UREL, 2004. (CS)

Recommended reading

K. HÁJEK, J. SADLÁČEK: Kmitočtové filtry. BEN, 2002, 536 stran. ISBN: 80-7300-023-7. (CS)

Elearning

eLearning: currently opened course

Classification of course in study plans

  • Programme BPC-AMT Bachelor's 0 year of study, summer semester, elective

  • Programme BPC-AUD Bachelor's

    specialization AUDB-TECH , 2 year of study, summer semester, compulsory-optional

  • Programme BPC-ECT Bachelor's 2 year of study, summer semester, compulsory-optional
  • Programme BPC-IBE Bachelor's 0 year of study, summer semester, elective
  • Programme BPC-MET Bachelor's 3 year of study, summer semester, compulsory-optional
  • Programme BPC-SEE Bachelor's 0 year of study, summer semester, elective
  • Programme BPC-TLI Bachelor's 3 year of study, summer semester, compulsory-optional

Type of course unit

 

Lecture

26 hod., optionally

Teacher / Lecturer

doc. Ing. Jiří Petržela, Ph.D.

Syllabus

1. Principal, object, types, characteristics and parameters of the EF.
2. Biquadratic RLC filters. Passive filters RC.
3. High-order RLC filters and design tools of them.
4. Active elements and functional blocks in filters, modeling of them.
5. Single-amplifier biquads (LP, BP, HP).
6. Multiple-amplifier biquads.
7. Elliptic ARC biquads and band-reject ARC filters.
8. Design of the high-order ARC filters, cascade synthesis.
9. ARC filters with functional blocks and synthetic elements.
10. All-pass filters and correctors.
11. Switched-capacitor electric filtering networks.
12. Electro-mechanic, piezoelectric and PAW filters.
13. Optimization of designed filters. Tuning and controlling of the filter parameters.

Exercise in computer lab

13 hod., compulsory

Teacher / Lecturer

doc. Ing. Jiří Petržela, Ph.D.

Syllabus

1. Simple passive filters RC and RLC.
2. Design of the high-order passive filters. Software NAF.
3. Analysis of selected active filter.
4. Optimization of the designed filters.
5. Comparing of sensitivity of active and passive filters.
6. Hierarchical modeling of active elements and functional blocks.
7. Single-amplifier and multiple-amplifier biquads, studying parasitic influences at HF.
8. Tuning and controlling of filter parameters, improving the value of Q.

Laboratory exercise

13 hod., compulsory

Teacher / Lecturer

Ing. Miroslav Rujzl

Syllabus

1. RC passive ladder filters, second and third order.
2. RLC passive ladder filtering structures of higher-orders.
3. Sallen-Key active low-pass filter with operational amplifier.
4. Synthetic elements in filtering applications with independent adjusting of parameters.
5. Kerwin-Huelsman-Newcomb filter with transadmittance amplifiers.
6. Universal fourth-order filter with multiple-loop integrator structure.
7. Biquadratic filter working in current mode.
8. Circuits with switched capacitors - universal integrated SC filter.

Elearning

eLearning: currently opened course