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- Andreani, Pietro, et al.
(författare)
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Analysis and design of a 1.8-GHz CMOS LC quadrature VCO
- 2002
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Ingår i: IEEE Journal of Solid-State Circuits. - 0018-9200. ; 37:12, s. 1737-1747
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a quadrature voltage-controlled oscillator (QVCO) based on the coupling of two LC-tank VCOs. A simplified theoretical analysis for the oscillation frequency and phase noise displayed by the QVCO in the 1/f/sup 3/ region is developed, and good agreement is found between theory and simulation results. A prototype for the QVCO was implemented in a 0.35-/spl mu/m CMOS process with three standard metal layers. The QVCO could be tuned between 1.64 and 1.97 GHz, and showed a phase noise of -140 dBc/Hz or less across the tuning range at a 3-MHz offset frequency from the carrier, for a current consumption of 25 mA from a 2-V power supply. The equivalent phase error between I and Q signals was at most 0.25/spl deg/.
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