A Dual-band CMOS Voltage Controlled Oscillator Using Phase Shift Technology
Date Issued
2010
Date
2010
Author(s)
Lai, Wei-Li
Abstract
The common architectures of wide tuning range’s voltage controlled oscillators are inductor-switching, capacitor-switching and oscillator-switching. The above architectures use MOSFETs as switches on the signal path of oscillating nodes.
Nevertheless, using MOSFETs as switches has heavy loss when oscillators are in high frequency operation. Also, using MOSFETs as switches will cause serious degradation in phase noise.
Base on these, we propose a dual-band voltage controlled oscillator which can operate at dual frequencies：14GHz and 6GHz for nowadays wireless communication applications. This dual-band voltage controlled oscillator uses cross-coupled pairs which can produce extra phase shift to switch to a different oscillating frequency. And oscillating signals will not go through these switches directly.
Subjects
VCO
Tuning Range
Phase Noise
Type
thesis
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