Design and measurement of class EF2 power oscillator

Madureira, Heider; Deltimple, Nathalie; Kerhervé, Eric; Dematos, Magalie; Haddad, S.A.P.

doi:10.1049/el.2014.4295

Cited by 5 publications

(2 citation statements)

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“…If we compared the obtained results of this work (phase noise -108 dBc/hz , tuning bandwith 920 MHz) with the published results of some scientific reports on microwave oscillator designs [11]- [17], we can conclude that this voltage controlled oscillator has good results in term of tuning bandwith, phase noise, good output power and frequency accuracy. These results were the product of deep study of each parameter of the voltage controlled oscillator and especially the interaction between these parametres.…”

Section: Resultssupporting

confidence: 51%

A Novel Design of Voltage Controlled Oscillator By using the Method of Negative Resistance

Malki¹,

Abdellaoui²,

Zbitou³

et al. 2018

IJECE

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<p>The objective of this paper is to develop a new design of a voltage controlled microwave oscillator by using the method of negative resistance in order to fabricate VCO with very good performance in terms of tuning rang, phase noise, output power and stability. The use of hybrid microwave integrated circuit technology’s (HMIC) offers a lot of advantage for our structure concerning size, cost, productivity, and Q factor. This VCO is designed at [480MHz; 1.4GHz] frequency for applications in the phase locked loop (PLL) for signal tracking, FM demodulation, frequency modulation, mobile communication, etc. The different steps of studied voltage controlled oscillator’s design are thoroughly described. Initially designed at a fixed frequency meanwhile the use of a varactor allow us to tune the frequency of the second design. It has been optimized especially regarding tuning bandwidth, power, phase noise, consumption and size of the whole circuit. The achieved results and proposed amendment are the product of theoretical study and predictive simulations with advanced design system microwave design software. A micro-strip VCO with low phase noise based on high gain ultra low noise RF transistor BFP 740 has been designed, fabricated, and characterized. The VCO delivers a sinusoidal signal at the frequency 480 MHz with tuning bandwidth 920 MHz, spectrum power of 12.62 dBm into 50 Ω load and phase noise of -108 dBc/Hz at 100 Hz offset. Measurement results and simulation are in good agreement. Circuit is designed on FR4 substrate which includes integrated resonators and passive components.</p>

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Section: Resultssupporting

confidence: 51%

A Novel Design of Voltage Controlled Oscillator By using the Method of Negative Resistance

Malki¹,

Abdellaoui²,

Zbitou³

et al. 2018

IJECE

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“…Through published results of some scientific reports on microwave oscillator designs [11][12][13][14][15][16][17] we observe that the best reached results are about: phase noise -101 dBc/hz efficiency 15. If we compared these results with ours (phase noise -120dBc/hz efficiency 16) we can conclude that this oscillator has record results in term of phase noise, better results in term of efficiency, good output power and frequency accuracy.…”

Section: Figure 10 Measured Phase Noise Of Microwave Oscillatormentioning

confidence: 99%

Design of Negative Resistance Oscillator with Rocord Low Phase Noise

Malki¹,

Zbitou²,

Abdellaoui³

et al. 2018

TELKOMNIKA

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Keywords: Oscillator, Negative resistance oscillator, Phase noise, ResonatorCopyright © 2018 Universitas Ahmad Dahlan. All rights reserved. IntroductionThe transceiver systems are becoming more complex to preserve the quality of information to transmit. These systems require local oscillator with very precise performance, the design of these oscillators is an attractive research field. The progress made in the microwave field have led to gradually replace the old type of oscillators with a more appropriate technology in terms of size and consumption. Today they take place in most communication equipment. Optimization of their characteristics is a critical point in the context of achieving the emission systems.Oscillators are structures that can be found in any electronic system since (GSM, radio communication, spacial communication, radar, electronic war and instrumentation) it is up to them to create the electrical signal in different frequency ranges. Then the quality of any system depends directly on the performance of the oscillator.In the other hand the technological tendency, the requirements of the regulations and the speed of development of the telecommunications have increasingly forced to fabricate oscillator with very precise performances in term of size, consumption, phase noise, stability and output power.To obtain very heighperformance several methods are used to achieve this goal, among theses methods we distinguish for instance: the methodbased on the negative resistance and the methodbased on the looped system.The configuration of looped system technique can only be used for a resonator with a single type of resonance. Also we have no control over the established state of the circuit, especially of other eventual instability that s ought at the desired frequency. The negative resistance concept is more understandable for reflected oscillator, although it can be applied for all types of oscillator. The harmonic balance simulation permits to determine accurately the established state of the circuit. That is why we are interested in this project to the reflected oscillator in the form of negative res istance system. Therfore in the present paper a new design of negative resistance oscillator are used for phase noise reduction, more stability of frequency, height efficiency of our oscillator and significated output power. Than the caracteristique of our oscillator show that we have

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