Course detail

# Electronic Filters

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.

Learning outcomes of the course unit

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.

Recommended optional programme components

Not applicable.

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)

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

Computer exercises during semester (30 points), laboratory measurement (10 bodů), final exam (60 points).

Language of instruction

Czech

Work placements

Not applicable.

Course curriculum

1. Continuous-time filtering fundamentals, types of filters.
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. Imittance converters and inverters, synthetic functional blocks, application examples.
11. Filters with switched capacitors, properties and practical applications.
12. Crystal-based filters, SAW filters and electromechanical conceptions.
13. Filters with spread parameters, lecture organized in cooperation with VVU Brno company.

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.

Classification of course in study plans

• Programme BKC-EKT Bachelor's, 2. year of study, summer semester, 5 credits, compulsory-optional

#### Type of course unit

Lecture

26 hours, optionally

Teacher / Lecturer

Exercise in computer lab

13 hours, compulsory

Teacher / Lecturer

Laboratory exercise

13 hours, compulsory

Teacher / Lecturer