Radio-Frequency Amplifiers

Course Description

Presentation of radio frequency amplifier design from active device small signal parameters through stability analysis, matching networks design up to final RF amplifier module with complete parameter characteristics.

General Competencies

The emphasis of course is in initiation of RF amplifiers design from low noise to linear RF power amplifiers. RF amplifiers design with main parameters measurements and results interpretation will be given.

Learning Outcomes

  1. Course deals with small signal amplifiers for lower and upper microwave frequencies (amplifier overview from low-noise to medium power).
  2. Course gives good insight in relevant processes which are essential for the amplifier functionality (static and dynamic operating points, RF feedback and source impedance).
  3. Acquired knowledge is sufficient for the practical implementations of simple RF amplifier models.
  4. Based on acquired knowledge, students determine impact of the all parameters on expected amplifier characteristics.
  5. Student will be able to construct simple circuits from the theoretical design to the practical implementation.
  6. Small signal amplifier measurements by means of network, spectrum and noise figure analyzer.

Forms of Teaching


Lectures with the help of the materials contained on the course website. The lectures are held with numerical examples.


Written assessment, combined with theoretical issues and numerical tasks.

Laboratory Work

Demonstration exercises whith practical measurements on the amplifier models.


Permanent consultation entire whole semester.

Grading Method

Continuous Assessment Exam
Type Threshold Percent of Grade Comment: Percent of Grade
Homeworks 0 % 15 % 0 % 0 %
Mid Term Exam: Written 0 % 25 % 0 %
Final Exam: Written 0 % 40 %
Final Exam: Oral 20 %
Exam: Written 0 % 50 %
Exam: Oral 50 %

Week by Week Schedule

  1. Linear fourpole parameters applicability in linear RF amplifiers analysis and measurements. Normalised power waves. Passivity and activity, undefined admitance and scattering matrix.
  2. Normalised power waves. Passivity and activity, undefined admitance and scattering matrix. Stability, stability factors, stability circles.
  3. Power gain definitions, constant power gain circles.
  4. Amplifier matching networks design, wideband matching restrictions, Bode integral. Wideband amplifiers with serial and parallel RF feedback.
  5. Wideband amplifiers with serial and parallel RF feedback. Wideband amplifiers with lossless feedback.
  6. Wideband amplifiers with lossy matching networks. Distributed microwave amplifiers.
  7. Distributed microwave amplifiers. Balanced amplifiers.
  8. Balanced amplifiers. RF medium power amplifiers.
  9. RF medium power amplifiers. Microwave integrated amplifiers (MMIC).
  10. Low noise amplifiers, static and dynamic active element biasing.
  11. Special purpose super low noise amplifiers. Nonlinear effects and intermodulation distortion.
  12. Nonlinear effects and intermodulation distortion. Broadband, high power nonlinear distortions. AM-AM and AM-PM conversion.
  13. Contemporary integrated RF modules for mobile systems.
  14. Design problems, CAD software and design examples with various active devices.
  15. RF amplifiers measurements. Results interpretation.

Study Programmes

Electronics -> Electrical Engineering and Information Technology (Profile)


Gonzales G. (1996.), Microwave Transistor Amplifiers:Analysis and Design 2/e, Prentice-Hall, Englewood Cliffs
B. S. Virdee, A. S. Virdee, B. Y. Banyamin (2004.), Broadband Microwave Amplifiers, Artech House
J. C. Pedro, N. B. Carvalho (2003.), Intermodulation Distortion in Microwave and Wireless Circuits, Artech House

Lecturers in Charge

Grading System

L0 English Level
L1 e-Learning
30 Lecturers
0 Exercises
0 Laboratory exercises


90 Excellent
75 Very Good
65 Good
50 Acceptable