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A 2 GHz differentially tuned CMOS
monolithic LC-VCO was designed and fabricated in 0.18-
μm CMOS process. The VCO has a 16.15% tuning range
(from 1.8998GHz to 2.2335GHz) due to a combination of
analog and digital tuning technique (4-bit binary switchcapacitor
array). The measured phase noise is -
118.17dBc/Hz at 1 MHz offset from 2.158 GHz carrier. With
the presented smart switch, the phase noise varies no more
than 3 dB at different digital control bits. The phase noise
changes only about 2 dB in the tuning range due to the pnjunctions
as the varactors. The VCO draws about 2.1 mA
current from the 1.8 V power supply and could work in 1.5
V power supply1.
Index Terms — VCO, phase noise, differentially tuned,
binary switchable-capacitor array.
monolithic LC-VCO was designed and fabricated in 0.18-
μm CMOS process. The VCO has a 16.15% tuning range
(from 1.8998GHz to 2.2335GHz) due to a combination of
analog and digital tuning technique (4-bit binary switchcapacitor
array). The measured phase noise is -
118.17dBc/Hz at 1 MHz offset from 2.158 GHz carrier. With
the presented smart switch, the phase noise varies no more
than 3 dB at different digital control bits. The phase noise
changes only about 2 dB in the tuning range due to the pnjunctions
as the varactors. The VCO draws about 2.1 mA
current from the 1.8 V power supply and could work in 1.5
V power supply1.
Index Terms — VCO, phase noise, differentially tuned,
binary switchable-capacitor array.
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