Yukun He, Renjie Tang, Ka'nan Wang, Dan Li, Li Geng, Xiaoyan Gui
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An LC Quadrature VCO With Compensated Coupling Networks for Low Supply Sensitivity and I/Q Phase Enhancement
An 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.
期刊介绍：
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Microwave circuits including RF, microwave and millimetre-wave amplifiers, oscillators, switches, mixers and other components implemented in monolithic, hybrid, multi-chip module and other technologies. Papers on passive components may describe transmission-line and waveguide components, including filters, multiplexers, resonators, ferrite and garnet devices. For applications, papers can describe microwave sub-systems for use in communications, radar, aerospace, instrumentation, industrial and medical applications. Microwave linear and non-linear measurement techniques.
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Radiowave propagation at all frequencies and environments.
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