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

• Main Authors: Sun, Junyi, Boon, Chirn Chye, Yi, Xiang, Lim, Wei Meng, Meng, Fanyi
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2016
• Subjects: Wideband; Start-up; Evenly distributed auxiliary cross-coupled pairs; K-band; CMOS VCO
• Online Access: https://hdl.handle.net/10356/82928; http://hdl.handle.net/10220/40369
• Institution: Nanyang Technological University

This study presents a K-band differential voltage-controlled oscillator (VCO) with robust start-up. A hybrid technique that combines open-loop digitally controlled tail current with switchable auxiliary cross-coupled pairs (ACCPs) is proposed to ensure robust start-up for wideband operation. Compared with prior closed-loop current controlling method, the proposed technique does not suffer from phase-noise degradation. Furthermore, by evenly distributing the ACCPs, transistors with smaller size are allowed to achieve the same start-up condition, which leads to frequency boost and phase-noise improvement. Implemented in 0.18 μm complementary metal-oxide-semiconductor technology, the VCO achieves a wide-frequency tuning range of 21.4-26.29 GHz (20.5%) and a low phase noise of -108.8 dBc/Hz at 1 MHz offset from 25.8 GHz carrier frequency. At 1.1 V power supply, the power consumption of the core circuit is 7.9-11.4 mW across the entire output frequency range.