Ultra-Wideband VCO Phase-Noise Reduction Loop Based on a Six-Port Phase-Shifterless Delay-Line Discriminator

Autor:	J. M. Avila-Ruiz, Alvaro Moscoso-Mártir, Laureano Moreno-Pozas, Íñigo Molina-Fernández
Rok vydání:	2014
Předmět:	Physics Voltage-controlled oscillator Radiation Discriminator Absolute phase Phase noise Crystal oscillator frequencies Electronic engineering Ultra-wideband dBc Electrical and Electronic Engineering Wideband Condensed Matter Physics
Zdroj:	IEEE Transactions on Microwave Theory and Techniques. 62:3076-3084
ISSN:	1557-9670 0018-9480
DOI:	10.1109/tmtt.2014.2366133
Popis:	In this paper, a novel frequency-locked loop (FLL) architecture for phase-noise reduction of wideband voltage-controlled oscillators (VCO) is presented. The circuit makes use of a phase-shifterless frequency discriminator, which completely avoids the use of any control circuitry to keep the loop in its quadrature condition, highly simplifying the loop. The FLL circuit, which can be operated in a completely transparent way, can be easily interchangeable with the original VCO. An FLL prototype, based on a commercial state-of-the-art VCO, has been fabricated and measured exhibiting a phase-noise reduction higher than 9 and 5.5 dB up to 100-kHz and 1-MHz offset from carrier, respectively, in the complete 4.6-9-GHz band. Absolute phase noise results of -106.5 and -124 dBc/Hz at 100-kHz and 1-MHz offset from carrier have been obtained, showing lower phase noise than other wideband FLLs in the literature.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f32607a89b76fb86a7eb2a681cfb6fb2 https://doi.org/10.1109/tmtt.2014.2366133 Zobrazit plný text záznamu