Low-Noise MMIC Phase-Locked Oscillators Using an EXOR and a PFC

Tadao NAKAGAWA  Hideo SUWAKI  Takashi OHIRA  

IEICE TRANSACTIONS on Electronics   Vol.E76-C    No.6    pp.950-954
Publication Date: 1993/06/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter-Wave Technology for Advanced Functions and Size-Reductions)
phase noise,  MMIC,  PLO,  PFC,  EXOR,  

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To reduce the phase noise of MMIC phase-locked oscillators (PLOs), we study the phase noise properties of PLOs given that the oscillator Q factor is relatively low in monolithic circuits. Such PLOs must have wide bandwidth in order to suppress monolithic oscillator noise. Therefore, to reduce MMIC PLO phase noise, the phase noise in the PLO passband has to be decreased. Noise generation by each component of the PLO, and its contribution to the output are discussed with emphasis on experimental estimation and rigorous analysis of the component phase- or baseband-noise. Based on these results, a new loop configuration is proposed for reducing phase noise in the PLO using a low Q-factor oscillator. It is demonstrated experimentally that PLOs based on the new loop exhibit 7 dB lower phase noise than conventional PLOs.