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A 5-9GHz 9mW Ring VCO with Quadrature Outputs for RPLLs in 45nm CMOS

Ring VCO Schematic

RVCO Schematic.png

Delay Cell Schematic

VCO Delay Cell.png

VCO Tuning Range

Tuning Range.png

Power Consumption Across Tuning Range

Power Consumption.png

VCO I-Q Phase Relationship at 5GHz (Low-End Frequency)

IQrelationship at 5GHz.png

VCO I-Q Phase Relationship at 9GHz (High-End Frequency)

IQ relationship at 9GHz.png
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