20.500.12556/RUL-158203 Wideband low phase-noise signal generation using coaxial resonator in cascaded phase locked loop The generation of high-quality wideband frequency sweeps presents a significant challenge, particularly in modern telecommunication, radar, and measurement systems where miniaturization is paramount. While phase-locked loops (PLLs) have become the dominant technique for signal generation, their application in broadband sweeps necessitates fractional-N operation. This, in turn, degrades phase noise and introduces unwanted spurs. This paper proposes a novel approach for broadband signal generation. By cascading two PLLs and utilizing a coaxial resonator, we achieve a high-performance oscillator that operates without the excessive fractional spurs, maintaining their level below 80 dBc across the entire frequency band. The prototype demonstrates non-degraded phase noise performance, reaching 102 dBc/Hz at 100 kHz offset and 121 dBc/Hz at 1 MHz offset for signals at 10 GHz. Despite significant frequency jumps, our design achieves lock times below 41 ▫$\mu▫$s. These results, supported by theoretical analysis, validate the proposed methods effectiveness in generating low-noise broadband frequency sweeps, ideal for local oscillator applications PLL phase-noise DDS coaxial resonator ultra-wideband spur-free fazno-sklenjena zanka fazni šum DDS koaksialni resonator ultra-širokopasovno true false true Angleški jezik Slovenski jezik Članek v reviji 2024-05-29 10:48:36 2024-05-29 10:48:39 2024-06-18 03:43:34 0000-00-00 00:00:00 2024 0 0 16 str. iss. 10, [article no.] 1934 Vol. 13 May-2 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.39 2079-9292 10.3390/electronics13101934 196609283 electronics-13-01934.pdf electronics-13-01934.pdf 1 42B12958D463A3C4116B8BB9D77DA303 f616290a2dae7700a0b2ee67ec4e240eb674812b1aa7a17b11805ee1102bdc17 6c9907be-1d98-11ef-9269-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=185710 https://www.mdpi.com/2079-9292/13/10/1934 1 3ff0cfba-1d98-11ef-9269-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=185708 Fakulteta za elektrotehniko 0 0 0