Wide-Band Low Phase-Noise Signal Generation Using Coaxial Resonator in Cascaded Phase Locked Loop

• DOI: 10.20944/preprints202404.0947.v1
• Publication Date: 2024-04-18T10:55:13Z
• Authors: Aljaž Blatnik; Boštjan Batagelj
• Keywords: Coaxial; SIGNAL (programming language)

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 broadband necessitates fractional-N operation. This, turn, degrades phase noise introduces unwanted spurs. This paper proposes novel approach generation. By cascading two PLLs utilizing coaxial resonator, we achieve high-performance oscillator that operates without excessive fractional spurs, maintaining level below -80 dBc across entire band. prototype demonstrates non-degraded performance, reaching -102 dBc/Hz at 100 kHz offset -121 1 MHz 10 GHz. Despite jumps, our design achieves lock times 41 µs. These results, supported by theoretical analysis, validate proposed method's effectiveness generating low-noise sweeps, ideal local applications.