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Design of Quadrature CMOS VCO using Source Degeneration Resistor  

Moon Seong-Mo (Department of Electrical & Computer Engineering University of Seoul)
Lee Moon-Que (Department of Electrical & Computer Engineering University of Seoul)
Kim Byung-Sung (School of Information and Communication Engineering, Sungkyunkwan University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.15, no.12, 2004 , pp. 1184-1189 More about this Journal
Abstract
A new schematic of quadrature voltage controlled oscillator(QVCO) is designed and fabricated. To obtain quadrature characteristic and low phase noise simultaneously, two differential VCOs are forced to un in quadrature mode by using coupling amplifier with a source degeneration resistor, which is optimized to obtain quadrature accuracy with minimum phase noise degradation. The designed QVCO was fabricated in standard CMOS technology. The measured performance showed the phase noise of below -120 dBc/Hz at 1 MHEz frequency offset, tuning bandwidth of 210 MHz from 2.34 GHz to 2.55 GHz with a tuning voltage varying form 0 to 1.8 V Quadrature error of 0.5 degree and amplitude error of 0.2 dB was measured with conjunction with low-lF mixer. The fabricated QVCO requires 19 mA including 5 mA in the VCO core part fiom a 1.8 V supply.
Keywords
Quadrature VCO; Source Degeneration Resistor; Phase Error; Phase Noise;
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