PMOS-switching-biased voltage-control-oscillator

A PMOS switching-biased VCO is investigated and fabricated by using TSMC 0.35 μm CMOS technology with 2.8 V power supply voltage. A switching bias is employed for the PMOS tail transistor to improve the phase noise. Measured tuning range is ranged from 2.87 GHz to 3.2 GHz. At 1 MHz offset from the carrier, the measured phase noise is -118.2 dBc/Hz. The chip takes 0.32 mm
²
area. For a 0.35mm process, under the consideration of output power, this design shows better performance over the figure of merit.