Design of a 24-GHz CMOS VCO with an asymmetric-width transformer

Authors:
Jaemo Yang;Choul-Young Kim;Dong-Wook Kim;Songcheol Hong
Affiliations:
Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology, Daejeon, Korea;Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology, Daejeon, Korea;Department of Radio Science and Engineering, Chungnam National University, Daejeon, Korea;Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology, Daejeon, Korea
Venue:
IEEE Transactions on Circuits and Systems II: Express Briefs
Year:
2010

Citing 2
Cited 1

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A 1-mW K-band gate AC-coupled VCO with 0.25 V supply voltage

Analog Integrated Circuits and Signal Processing

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Abstract

A K-band CMOS voltage-controlled oscillator (VCO) is implemented with a 0.18-µm radio frequency CMOS process. For low supply voltage operation, a transformer-feedback topology using a transformer is proposed. The analysis of the transformer-feedback VCO is presented. This shows that the inductance ratio of the transformer must be optimized, and asymmetric-width transformers allow the easy optimization and the high Q-factor. Based on this analysis, the transformer design consideration of the transformer feedback VCO is presented. The VCO operates at 24.27 GHz with the phase noise of -100.33 dBc/ Hz at 1-MHz offset, and it consumes 7.8mW from a 0.65-V supply voltage.