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A Comparative Study of 8-Phase Feedforward-Coupling Ring VCOs
Iat-Fai Sun1; Jun Yin2; Pui-In Mak1; Rui P. Martins1
2018-08-14
Source PublicationIEEE Transactions on Circuits and Systems II: Express Briefs
ISSN1549-7747
Abstract

This Brief studies comparatively the different 8-phase feedforward-coupling (FC) ring voltage-controlled oscillators (FC-RVCOs) in terms of their oscillation modes, oscillation frequency and phase noise. Among the 3 feasible topologies, the one with sub-feedback loops containing 2 Direct-path inverters + 1 Feedforward-path inverter (i.e. 2D + 1F) can achieve a better phase noise than the common 4D + 1F topology at the same frequency and power budget. It is also shown that the bimodal oscillation problem of the 2D + 1F topology can be eliminated by inserting an auxiliary FC path. Prototyped in 65-nm CMOS, the proposed 2D + 1F topology at 3.1 GHz shows a phase noise of -95.1 dBc/Hz at a 1-MHz offset, corresponding to a 159.9 dBc/Hz Figure-of-Merit (FoM) that is 4.2 dB higher than the common 4D + 1F topology.

Keyword8-phase Ring Voltage-controlled Oscillators (Rvco) Cmos Feedforward Coupling (Fc) Phase Noise Bimodal Oscillation Clock Generation Lo Generation
DOIhttp://doi.org/10.1109/TCSII.2018.2865465
Indexed BySCI
Language英语
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Document TypeJournal article
CollectionFaculty of Science and Technology
DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING
Corresponding AuthorPui-In Mak
Affiliation1.State-Key Laboratory of Analog and Mixed-Signal VLSI, and Faculty of Science and Technology-ECE, University of Macau, Macao, China
2.State-Key Laboratory of Analog and Mixed-Signal VLSI, University of Macau, Macao, China
First Author AffilicationFaculty of Science and Technology
Corresponding Author AffilicationFaculty of Science and Technology
Recommended Citation
GB/T 7714
Iat-Fai Sun,Jun Yin,Pui-In Mak,et al. A Comparative Study of 8-Phase Feedforward-Coupling Ring VCOs[J]. IEEE Transactions on Circuits and Systems II: Express Briefs,2018.
APA Iat-Fai Sun,Jun Yin,Pui-In Mak,&Rui P. Martins.(2018).A Comparative Study of 8-Phase Feedforward-Coupling Ring VCOs.IEEE Transactions on Circuits and Systems II: Express Briefs.
MLA Iat-Fai Sun,et al."A Comparative Study of 8-Phase Feedforward-Coupling Ring VCOs".IEEE Transactions on Circuits and Systems II: Express Briefs (2018).
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