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PROJECT TITLE :

Design and analysis of a K-band wideband voltage-controlled oscillator with robust start-up and frequency boost

ABSTRACT:

This study presents a K-band differential voltage-controlled oscillator (VCO) with strong begin-up. A hybrid technique that combines open-loop digitally controlled tail current with switchable auxiliary cross-coupled pairs (ACCPs) is proposed to make sure sturdy start-up for wideband operation. Compared with previous closed-loop current controlling method, the proposed technique will not suffer from section-noise degradation. Furthermore, by evenly distributing the ACCPs, transistors with smaller size are allowed to realize the identical start-up condition, which ends up in frequency boost and section-noise improvement. Implemented in zero.eighteen μm complementary metal–oxide–semiconductor technology, the VCO achieves a large-frequency tuning vary of twenty one.4–26.twenty nine GHz (20.fivep.c) and an occasional part noise of −108.8 dBc/Hz at one MHz offset from twenty five.eight GHz carrier frequency. At one.1 V power provide, the facility consumption of the core circuit is seven.9–eleven.4 mW across the whole output frequency vary.


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