Naslov
Voltage-controlled capacitor for large signals

Autori
Brubnjak, Mateo

Vrsta, podvrsta i kategorija rada
Ocjenski radovi, diplomski rad, preddiplomski

Fakultet
Fakultet elektrotehnike i računarstva

Mjesto
Zagreb

Datum
02.09

Godina
2019

Stranica
43

Mentor
Babić, Dubravko

Ključne riječi
transformers, varactor diodes, high-frequency electronics, wide-band electronics, scattering parameters

Sažetak
The thesis explores the possibility of using micro-transformers, in the 10-1000MHz range, for the purpose of reducing voltage amplitude for components that require a constant working point, specifically varactor diodes. Varactor diodes are considered for use as voltage-controlled capacitors in tuning circuits for large signal power amplifiers. Normally this is impossible as the signal power (1-3W) in these circuits produces deviations from the varactor diode working point turning it into a large source of nonlinearity. An equivalent microwave transformer model was developed that accurately predicts behavior before the first s21 resonance frequency. An efficient method for characterization of this model was developed that uses S- parameter measurements. The method includes determining the inductance of the primary and secondary coil, coupling factor and the parasitic capacitance that causes the first resonant frequency in the measured s21 parameter, beyond which the transformer no longer functions as required.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

Napomena
Bachelor's Thesis No. 5973

POVEZANOST RADA