Electric Filters

The course is a substitute for:

Electric Filters (D31EFI)

Lecturer:

Tutor:

Supervisor:

Department of Circuit Theory

Synopsis:

A survey of passive- and active-filter design and implementation is given by this subject. The practical design requirements, conditions and problems are emphasized. The first part deals with the optimum-design of passive-LC filters. A particular part is devoted to the piezoceramic, crystal and SAW filters and their optimum application. The second part is oriented to the optimum design of active filters - the second-order and higher-order. Design and technological constraints are discussed. An attention is devoted to the new ways of ARC filter design - current-mode filters, filters based on prospective active devices (CC, OTA, TIA), integrated filters and sampled-data filters (SC, SI). Practical design examples are solved.

Requirements:

Syllabus of lectures:

1. Electric filters - a survey, typical applications, requirements specification

2. System criteria, a general design algorithm, approximation problem

3. Passive LC-filters: non-standard design and optimization, losses influence

4. Filter structure optimization procedures, production and technological constraints

5. Filters containing piezoelectric elements, crystal and SAW filters, operation conditions

6. ARC filters - a survey, optimum design of ARC filters, prospective filter structures, sensitivity

7. Biquad optimum design, an influence of active devices non-idealities

8. Low-sensitivity higher-order filters

9. New ways of ARC filter design, current-mode filters

10. Filters based on current conveyors, OTA and current-feedback amplifiers

11. Design optimization, technological constraints, integrated filters

12. Sampled-data filters, SC integrated filters, tunable filters

13. Filter design for power- and pulse- applications

14. New trends and developments of analog filters

Syllabus of tutorials:

1. Introduction, filter parameters specification, design constraints

2. Approximation problem - a solution, a comparison of approximation functions. CAD means

3. A practical example of non-standard LC filter design

4. Filter design optimization with respect to the losses influence

5. Band-pass filter optimized design

6. Measurement of crystal and piezoceramic filters, influence of correct filter termination

7. Design of 4th-order LP and BP filter using biquads

8. Design of 4th-order LP and BP filter using biquads - cont. Simulation of non-ideal behavior

9. Filter design using LC-prototype simulation

10. Current-mode filter design, current-conveyor-biquad design

11. OTA-C LP filter design, tunability solution

12. Integrated SC filter design, design software, practical design of 4th-order filter using LTC 1164

13. SC filter construction and measurement

14. Presentation of semestral works

Study Objective:

Study materials:

1. Mitra, S.K., Kurth, C.F.: Miniaturized and Integrated Filters. John Wiley, 1989

2. Schaumann, R., Ghausi, M.S., Laker, K.R.: Design of Analog Filters. Prentice Hall, 1990

Note:

Further information:

No time-table has been prepared for this course

The course is a part of the following study plans:

• Electronics - Electronic Systems- structured studies (compulsory elective course)
• Economics and Management in Electrical Engineering- structured studies (compulsory elective course)
• Electronics - Electronics and Photonics- structured studies (compulsory elective course)