An LC Quadrature VCO With Compensated Coupling Networks for Low Supply Sensitivity and I/Q Phase Enhancement

• DOI: 10.1049/mia2.70005
• Publication Date: 2025-03-12T06:05:24Z
• Authors: Yukun He; Renjie Tang; Ka'nan Wang; Dan Li; Li Geng; Xiaoyan Gui

ABSTRACTAn LC quadrature voltage‐controlled oscillator (LC‐QVCO) with novel compensated coupling networks to achieve both low supply sensitivity and quadrature phase enhancement is proposed. Designed and fabricated in a standard 0.18‐μm CMOS process, the proposed QVCO improves the supply noise rejection by more than 16.72 dB compared with the conventional LC‐QVCO and achieves quadrature phase error of < 0.86° within the frequency tuning range from 3.32 to 3.52 GHz, whereas occupying a core area of 504 × 400 μm2 and consuming 3.2 mA including the bias circuitry, from a 1.8‐V supply voltage. The phase noise is measured to be −110.64 dBc/Hz at 1 MHz offset and −130.49 dBc/Hz at 10 MHz offset from the high‐band carrier frequency at 3.52 GHz.