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Analysis on resonator coupling and its application to CMOS quadrature VCO at 8 GHz

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5 Author(s)
Donghyun Baek ; Dept. EECS, Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea ; Taeksang Song ; Sangsoo Ko ; Euisik Yoon
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A low phase noise CMOS quadrature VCO is presented. A transformer resonator coupling is analyzed. It is found that the coupled resonator has high frequency selectivity. The Q factor of a coupled resonator is (1+k) times higher than a single LC resonator. This enhancement leads to low phase noise and low power consumption of a VCO. The VCO is implemented using 0.18 μm CMOS technology. Two VCOs are linked to generate I-Q signals by the direct current modulation method. The VCO shows low phase noise performances of -110 and -117 dBc/Hz at the offset frequencies of 600 kHz and 1 MHz respectively. The oscillation frequency is 8 GHz. The tuning range of 250 MHz is achieved with a control voltage from 0 to 1 V. The VCO draws 8 mA in core circuits with 3 V supply.

Published in:

Radio Frequency Integrated Circuits (RFIC) Symposium, 2003 IEEE

Date of Conference:

8-10 June 2003