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A wide-band digitally controlled ring oscillator

A wide-band digitally controlled ring oscillator,10.1109/ISCAS.2010.5537077,Liangge Xu,Kari Stadius,Jussi Ryynánen

A wide-band digitally controlled ring oscillator   (Citations: 1)
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This paper presents an analysis and design of a digitally controlled ring oscillator with a new band-extension technique to achieve wide-band operation. The proposed technique is based on inclusion of an LC tank to boost the frequency range. Two frequency sub-ranges are covered with the tank on and off respectively, and they jointly constitute a very wide frequency tuning range. Implemented as a building block of a digital frequency synthesizer, the ring oscillator has a measured tuning range of 2.65-6.3 GHz, with power consumption less than 16 mW from a 1.2-V supply. The worst-case measured phase noise at 1-MHz offset is -85 dBc/Hz.
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