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oai:riuma.uma.es:10630/332102026-02-03T11:05:19Zcom_10630_2254col_10630_37953

Ultra-Wideband VCO Phase-Noise Reduction Loop Based on a Six-Port Phase-Shifterless Delay-Line Discriminator. Ávila Ruiz, Juan Manuel Molina-Fernández, Íñigo Moreno-Pozas, Laureano Moscoso Mártir, Álvaro Osciladores Semiconductores de banda ancha 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. 2024-09-25T10:33:00Z 2024-09-25T10:33:00Z 2024-09-25T10:33:00Z 2014-11-14 journal article J. M. Ávila-Ruiz, I. Molina-Fernández, L. Moreno-Pozas and A. Moscoso-Mártir, "Ultra-Wideband VCO Phase-Noise Reduction Loop Based on a Six-Port Phase-Shifterless Delay-Line Discriminator," in IEEE Transactions on Microwave Theory and Techniques, vol. 62, no. 12, pp. 3076-3084, Dec. 2014. https://hdl.handle.net/10630/33210 10.1109/TMTT.2014.2366133 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional IEEE Transactions on Microwave Theory and Techniques