Abstract

Quadrature oscillators (QOSCs) can operate in two selective modes of quadrature oscillation. By controlling the mode of oscillation, different wide tuning range CMOS LC QOSCs have been designed. The measured tuning range is 60% for 3.7 GHz design and 94% for 1.3 GHz design. Phase noise measurement shows that by this modified series coupled QOSC (S-QOSC) a FOMT (figure of merit with tuning range) of 199 dB can be achieved.

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