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A 1V CMOS quadrature LC VCO using diode coupling

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2 Author(s)
Chan Tat Fu ; Hong Kong Univ. of Sci. & Technol., Hong Kong ; Luong, H.C.

A new quadrature VCO is designed in a standard UMC 0.13 mu m CMOS process with low voltage, low power and low phase noise. Diodes are employed to generate second-harmonic coupling between the common sources of two LC VCOs for quadrature outputs. At 1-V supply and at 3.9 GHz, the QVCO measures phase noise of -117dBc/Hz at 1-MHz offset while dissipating 7.5 mA which corresponds to a figure of merit of 180 dBc. The core area is 0.37 mm2.

Published in:

Radio and Wireless Symposium, 2008 IEEE

Date of Conference:

22-24 Jan. 2008