This
paper presents a low-phase-noise LC voltage-controlled oscillator (LC-VCO) with
top resistive biasing in subthreshold region. The subthreshold LC-VCO has
low-power and low-phase-noise due to its high transconductance efficiency and
low gate bias condition. The top resistive biasing has more benefit with the
feature of phase noise than MOS current source since it can support the low-noise
characteristics and large output swing. The LC-VCO designed in 130-nm CMOS
process with 0.7-V supply voltage achieves phase noise of -116 dBc/Hz at 200
kHz offset with tuning range of 398 MHz to 408 MHz covering medical implant
communication service (MICS) band.
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