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Adaptively Phase-Shift Controlled Self-Injection Locked VCO
Masaomi TSURU Kengo KAWASAKI Koji TSUTSUMI Eiji TANIGUCHI
Publication
IEICE TRANSACTIONS on Electronics
Vol.E98-C
No.7
pp.677-684 Publication Date: 2015/07/01 Online ISSN: 1745-1353
DOI: 10.1587/transele.E98.C.677 Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology) Category: Active Circuits/Devices/Monolithic Microwave Integrated Circuits Keyword: self-injection locked oscillator, phase noise, delay lines, phase-shift control,
Full Text: PDF(1.5MB)>>
Summary:
An adaptively phase-shift controlled self-injection locked VCO is described. A self-injection locking technique is effective to reduce phase noise. However, a conventional self-injection locked VCO has drawbacks of discontinuous frequency sweep which means narrow bandwidth, and large variation of phase noise. Our proposed adaptively phase-shift controlled self-injection locked VCO overcomes these drawbacks by detecting phase-shift of the self-injection feedback and controlling the phase-shift depending on sweep of the oscillation frequency. This paper describes analysis of relationships between the discontinuity and feedback phase-shift of the self-injection locked VCO. In addition, a VCO-IC which includes a Ka-band VCO and a phase detector is designed and fabricated in 0.18um SiGe BiCMOS technology. Measurement results of the proposed self-injection locked VCO using the fabricated IC show the improvement to the drawbacks. In the proposed self-injection locked VCO, the oscillation frequency sweep is continuous and the phase noise variation is less than 5 dB.
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