A 5.5 GHz Voltage Control Oscillator (VCO) with a Differential Tunable Active and Passive Inductor
Keywords:
Differential active inductors, passive inductor, frequency tuning range, phase noise, voltage control oscillator (VCO), wideband.Abstract
By using a differential tunable active and passive
inductor for LC tank, respectively a wide tuning rang and high
phase noise performance CMOS voltage control oscillator
(VCO) is introduced and compared. In the proposed circuits'
structure, the coarse frequency tuning is provided by the
tunable active inductor, while the fine tuning is controlled by
varactor. Using a 0.18µm CMOS process, complete pattern
VCOs are designed in ADS. The output frequency in both
structures is 5.5GHz. The design based on active inductor
generates unacceptable phase noise in compare with on passive
inductor. The measured phase noise in 1-MHz offset is -81 and -106.4dBc in VCO with active and passive inductor respectively.
The non existence of passive components in the first structure
causes VCO to have the smaller chip area than the circuit with
passive inductors.
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