Design of a Low-Phase-Noise LC Voltage Controlled Oscillator

Abstract:

A novel low phase noise LC Voltage Controlled Oscillator (LC-VCO) is designed in standard 0.18μm CMOS technology. Instead of common NMOS cross-pairs for a conventional complementary LC VCO, both body-biasing and Q-enhancement techniques are employed to provide a larger negative resistance for the VCO. Post-layout simulations showed that it can oscillate at a frequency range of 4.34-4.73GHz, and comsume a supply current of 1.52mA from a supply voltage of 1.8V. The VCO achieves a phase noise of -132.8dBc/Hz @ 1MHz offset and a figure of merit (FOM) of -195.9dBc/Hz at the frequency of 4.5GHz. A die area of 475μm×498.6μm is occupied.

• Periodical: Applied Mechanics and Materials (Volumes 519-520)
• Pages: 1095-1098
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.519-520.1095
• Online since: February 2014
• Authors: Cheng Hong Dong, Chang Chun Zhang*, Yu Feng Guo, Lei Lei Liu, Xin Cun Ji, Yi Zhang
• Keywords: Body-Biasing, LC VCO, Low Phase Noise, Q-Enhancement

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