Pulzni močnostni ojačevalnik

Bahar, Aljoša (author), Beguš, Samo (mentor)

V laboratoriju je bil izdelan pulzni močnostni ojačevalnik z močjo 7 W in pasovno širino (-3 dB) 13 MHz. Namenjen je vgradnji v SDR-platformo (programsko definiran radio) za merjenje z metodo NQR. Ta se uporablja za detekcijo eksplozivov, odkrivanje polimorfizmov v zdravilih ter karakterizacijo spojin, ki vsebujejo dušik. Vezje je bilo realizirano kot neinvertirajoči pulzni ojačevalnik, dodali pa smo mu aktivno zaključitev, izvedeno s pozitivno povratno vezavo. S tem pristopom smo dosegli, da smo na bremenu povečali moč iz 3,3 W na 7 W, na zaključitvenem uporu pa zmanjšali iz 3,3 W na 2,1 W. Upore smo določili s pomočjo simulacijskega okolja LTspice. Na tiskano vezje smo poleg močnostnega ojačevalnika dodali še dva predojačevalnika, namenjena sprejemni strani platforme.

• Language: Slovenian
• Keywords: Pulzni močnostni ojačevalnik, aktivna zaključitev, izhodna impedanca
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2025
• PID: 20.500.12556/RUL-171593
• COBISS.SI-ID: 248124419
• Publication date in RUL: 28.08.2025

Secondary language

• Language: English
• Title: Pulse power amplifier

Abstract

A pulsed power amplifier with a power of 7 W and a bandwidth (-3 dB) of 13 MHz was manufactured in the laboratory. It is intended for installation in an SDR platform for measurement using the NQR method. This is used for the detection of explosives, polymorphisms and the characterization of nitrogen-containing compounds. The circuit was implemented as a non-inverting pulsed amplifier, and active termination was added to it, implemented with positive feedback. With this approach, increased power was achieved at the load from 3,3 W to 7 W, and reduced from 3,3 W to 2,1 W at the termination resistor. The resistors were determined using the LTspice simulation environment. In addition to the power amplifier, two preamplifiers were added to the printed circuit board, intended for the receiving side of the platform.

• Keywords: Pulsed power amplifier, active termination, output impedance