CMOS 5-10 GHz oscillators for low voltage RF applications

This paper presents the design and experimental measurements of three CMOS LC-based oscillators. The first circuit is optimized for low voltage operation in a 0.25 /spl mu/m process, requiring only a 0.85 V power supply and reaching a maximum frequency, of 4 GHz. The second circuit is a 5 GHz oscillator in a 0.35 /spl mu/m process operating from a 1.5 V power supply and optimized for a wide tuning range (10%) while maintaining reasonable phase noise (-87.3 dBc/Hz at 100 kHz offset). Finally, the third oscillator targeted high frequency operation reaching a maximum oscillating frequency of 10.5 GHz in a 0.35 /spl mu/m process. The oscillators make use of on-chip components only, allowing for simple and robust integration.