Course detail
High Frequency Techniques
FEKT-BPC-VFTAcad. year: 2024/2025
The course is focused on design basics of passive and active high frequency circuits working up to approx. 3 GHz. First part is dedicated to passive circuits: resonant circuits and matching networks, attenuators, splitters, combiners and HF switches. Second part is focused on amplifiers, mixers, oscillators and frequency synthesizers.
Language of instruction
Number of ECTS credits
Mode of study
Guarantor
Department
Entry knowledge
- explain basics of electronic circuits and electromagnetic waves and transmission lines (inductance, capacitance, impedance, reflection coefficient, Smith chart, standing wave ratio)
- analyze basic electronic circuits with passive components
- calculate with complex numbers and logarithms
Rules for evaluation and completion of the course
- written tests: 1x14 points
- final exam: 66 points
The final exam consists of 2 parts: 30 points in theoretical part, 36 points in numerical examples. The student must get min. half points of each part to pass the exam successfully.
In the case of forced online teaching, the attendance parts would be suplemented by distance online alternatives.
Evaluation of activities is specified by a regulation, which is issued by the lecturer responsible for the course annually.
Aims
After successful passing the final exam, the student should be able to:
- calculate power, voltage and current levels in decibels
- describe important electrical parameters of wire, coil and capacitor from the high frequency point of view
- explain behavior and electrical parameters of series and parallel resonant circuit as well as coupled resonant circuits
- explain principle and show examples of lumped element filters
- using the Smith chart, explain principle of impedance transformation with parallel resonant circuit, L-network, T-network and PI-network
- explain principle and describe important parameters of attenuator, HF power combiner and switch
- explain terms: stability and gain of linearized amplifier
- explain and calculate with important parameter of amplifier (dynamic range, intercept point, 1dB compression, noise figure)
- explain terms: mixer and its output spectrum, conversion loss, conversion gain, image frequency and draw basic mixer schematics
- explain principle of feedback oscillators and draw basic schematics of LC and crystal oscillators
- explain terms: phase noise and stability of HF signal
- draw basic schematics of PLL and DDS syntehsizers
- explain principle and important parameters of PLL and DDS systems
Study aids
Prerequisites and corequisites
Basic literature
VÁGNER, P. Vysokofrekvenční technika. Skripta [online]. 2013 [cit. 2017-08-12]. Dostupné z elearningových stránek předmětu. (CS)
Recommended reading
RADMANESH, M., M. Advanced RF & Microwave Circuit Design. AuthorHouse 2010. (EN)
RADMANESH, M., M. RF & Microwave Design Essentials. AuthorHouse 2007. (EN)
ŽALUD, V. Moderní radioelektronika. Vydavatelství BEN, Praha 2000 (CS)
Elearning
Classification of course in study plans
Type of course unit
Lecture
Teacher / Lecturer
Syllabus
2. Impedance transformation using parallel resonant circuit
3. Coupled resonant circuits. Power and impedance matching using RLC circuits
4. Power splitters and combiners, attenuators and HF switches
5. Linearized transistor model. S-parameters
6. Stability, stability circles, gain, constant gain circles
7. Noise in circuits. Noise temperature, noise figure. Noise matching
8. Narrowband and broadband amplifier. Low noise amplifier
9. Large signal amplifier. Operating classes, main parameters
10. Mixer and its output spectrum, mixer parameters. Mixer schematics
11. Transistor oscillators, fixed and tunable oscillators
12. Phase locked loop. PLL synthesizers
13. Direct digital synthesis DDS
Laboratory exercise
Teacher / Lecturer
Syllabus
Nonlinear amplifier
Linear amplifier
Resonant circuits
Double balanced mixer
PLL synthesizer
Elearning