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Radio-frekvenčni vir s slabilcem 35MHz-4.4GHz
IVANIĆ, ZORAN (Avtor), Vidmar, Matjaž (Mentor) Več o mentorju... Povezava se odpre v novem oknu

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Izvleček
To delo opisuje izdelavo radio-frekvenčnega vira, ki deluje na osnovi ulomkovne fazno-sklenjene zanke za območje od 34,375 MHz do 4400 MHz. Z dodanim nastavljivim slabilcem dobi tak vir obliko praktičnega instrumenta, ki se uporablja pri razvoju in testiranju radijskih komponent in zvez. V uvodnem delu je opisana zasnova instrumenta z izbranimi komponentami. Sledi kratek teoretični opis sinteze signala s formulami z uporabo ulomkovne fazno-sklenjene zanke na primeru ADF4351 integriranega vezja. V drugem delu je opisana praktična izvedba vseh sestavnih blokov inštrumenta z električnimi načrti, meritvami karakteristik in se zaključi z opisom pomembnejših delov programske kode, ki krmili instrument. ADF4351 se napaja preko ADP150 in LM1117 regulatorjev. Sintetizirani signal potuje preko baluna iz feritnih obročkov na MMIC ojačevalnik gali5+ in od tu naprej na vezje slabilca. Slabilec je zgrajen z zaporedno vezavo dveh HMC307, ki se krmilita z dvemi preklopniki 4053 in serijsko-paralelnega pomikalnega registra 74HC595. HMC307 in 4053 potrebujejo za svoje delovanje negativno napetost, ki jo zagotavlja inverter LM828. Pomikalni register se krmili z mikrokrmilnikom, ki sprejema ukaze preko štirih tipk s pomočjo LCD zaslona. Instrument se napaja preko regulatorja RC1587M, ki pretvarja zunanjo napetost +12 V na +5 V. Programska koda omogoča preprosto uporabniško izkušnjo, natančno kalibracijo instrumenta in preverjanje delovanja kode preko serijskega vodila. V zadnjem delu so opisane še nekatere omejitve ADF4351 in ideje za izboljšave, ter predstavljeni rezultati meritev moči izhodnega nosilca.

Jezik:Slovenski jezik
Ključne besede:ADF4351, HMC307, 4053, 74HC595, LM828, ADP150, LM1117, fazno-sklenjena zanka, napetostno kontrolirani oscilator, slabilec
Vrsta gradiva:Diplomsko delo (m5)
Organizacija:FE - Fakulteta za elektrotehniko
Leto izida:2016
Število ogledov:662
Število prenosov:384
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
 
Skupna ocena:(0 glasov)
Vaša ocena:Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.
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Sekundarni jezik

Jezik:Angleški jezik
Naslov:Radio-frequency source with attenuator 35MHz-4.4GHz
Izvleček:
This work describes the design of a radio-frequency source, based on fractional phase-locked loop signal synthesis in the range of 34.375MHz to 4400MHz. With the addition of an adjustable attenuator to the RF source, we obtain a practical instrument that can be used in the development and testing of radio components and networks. The introductory part describes the design of the instrument with the selected components. Followed by a brief description of the theoretical signal synthesis formulas, using fractional phase-locked loop in the case of the ADF4351 integrated circuit. The second part describes the practical implementation of all the constituent blocks of the instrument with the electrical plans, measurement characteristics and concludes with a description of the most important parts of the software code that control the instrument. ADF4351 is powered by ADP150 and LM1117 regulators. The synthesized signal travels through the balun made of ferrite rings, to the MMIC amplifier Gali5 + and from there, to the circuit of the attenuator. The attenuator is made of two HMC307s, connected in series, which are controlled by two 4053 multiplexers and a serial-parallel shift register 74HC595. The HMC307 and 4053 need a negative voltage supply, for their operation, which is provided by the LM828 inverter. The shift register is controlled by a microcontroller, which receives commands via the four keys on the LCD screen. The instrument is powered by the voltage regulator RC1587M that converts an external voltage of + 12V to + 5V. The software code provides a better user experience, accurate instrument calibration and verification of operation code via the serial bus. The final section describes some limitations of the ADF4351 and ideas for improvement, and the results of measurements of the output power of the carrier.

Ključne besede:ADF4351, HMC307, 4053, 74HC595, LM828, ADP150, LM1117, phase-locked loop, voltage controlled oscillator, attenuator, VCO, PLL

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