Izvedba kakovostnega spektralnega analizatorja s sledilnim izvorom, ki kot rezultat meritve podaja natančen oris razmer na njegovem vhodu, ostaja nespremenjena že zadnjih 50 let. Napredki pri izdelavi polprevodnikov in integriranih vezji omogočajo kompaktnejšo vgradnjo, kompleksnejšo obdelavo in nižjo ceno končne naprave. Najnovejša tehnologija sic...
La montée en fréquence observée depuis les années 2000 dans le domaine des télécommunications justifiele développement d’oscillateurs hautes fréquences (HF) voir ultra-hautes fréquences (UHF). La qualité des oscillateursdans ces gammes de fréquence reste cependant limitée par les pertes matériaux à ces longueurs d’onde.Dans ce contexte, les oscilla...
This article presents a 4-to-5 GHz LC oscillator operating at 4.2K for quantum computing applications. The phase noise (PN) specification of the oscillator is derived based on the control fidelity for a single-qubit operation. To reveal the substantial gap between the theoretical predictions and measurement results at cryogenic temperatures, a new ...
To realize the real-time measurement of masses of nanoparticles, virus molecules, organic macromolecules, and gas molecules, and to analyze their physical and chemical properties, a ZnO nanowire (NW) resonator operating at room temperature with an ultrahigh resonant frequency, real-time detection, and high precision was designed and developed in th...
Published in Frontiers in Mechanical Engineering
Over the past two decades, the advancement in microelectromechanical systems (MEMS) has been making headway in the development of miniaturized mechanical structures with integrated electronics. By adopting the existing layer in the complementary metal–oxide–semiconductor (CMOS) fabrication platform, the so-called “CMOS-MEMS” technology offers an in...
Power inversion (PI) is a known adaptive beamforming algorithm that is widely used in wireless communication systems for anti-jamming purposes. The PI algorithm is typically implemented in a digital domain, which requires the radio-frequency signals to be down-converted into base-band signals, and then sampled by ADCs. In practice, the down-convers...
High-frequency signal oscillators are devices needed for a variety of scientific disciplines. One of their fundamental requirements is low phase noise in the micro- and millimeter wave ranges. The opto-electronic oscillator (OEO) is a good candidate for this, as it is capable of generating a signal with very low phase noise in the micro- and millim...
Published in Frequenz
A phase-locked loop (PLL) cascade driven by a crystal oscillator and a free running dielectric resonator oscillator (DRO) is proposed. For minimizing phase noise, spurious tones and jitter, a programmable PLL1 in the lower GHz range is used to drive a millimeter-wave (mmW) PLL2 with a fixed frequency multiplication factor. The phase noise analysis ...
This article presents the first results of the timing-jitter characterization of a VCSEL-based optoelectronic oscillator (VBO) at 2,5 GHz. For all implementations, vertical-cavity surface-emitting lasers (VCSEL) emitting in the O and C-bands were characterized. The resonant cavity was modified through the optical delay line length to verify its imp...
The low-level radio frequency (LLRF) control system is one of the fundamental parts of a particle accelerator, ensuring the stability of the electro-magnetic (EM) field inside the resonant cavities. It leverages on the precise measurement of the field by in-phase/quadrature (IQ) detection of an RF probe signal from the cavities, usually performed u...
