Design and realization of radio frequency amplifiers

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Szombathy Csaba Zoltán
Department of Broadband Infocommunications and Electromagnetic Theory

The purpose of this Thesis is to learn the basics of designing and building radio frequency amplifiers.

To achieve the above goal, I cover the fundamental construction, benefits and drawbacks of amplifiers, along with the introduction of transistors used in radio frequency amplifiers. In addition, I also explain the basic principles of amplifier matching, highlighting why these are important during the realization of the circuits. I intend to describe the actual design process on the example of two circuits.

I first built an amplifier that features lower power and operates on smaller frequencies. This comprises two stages and contains bipolar transisors. During the description of this I also cover issues that have significance in case of VHF/UHF-band amplifiers.

The second amplifier is a high power stage operating in the VHF band. I tested its suitability for transferring DVB-T signals. This is a high power circuit based on an LDMOS transistor, whose operational verification will be presented herein.


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