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Design of a 24-GHz CMOS VCO With an Asymmetric-Width Transformer

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4 Author(s)
Jaemo Yang ; Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea ; Choul-Young Kim ; Dong-Wook Kim ; Songcheol Hong

A K-band CMOS voltage-controlled oscillator (VCO) is implemented with a 0.18- ??m 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 7.8 mW from a 0.65-V supply voltage.

Published in:

Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:57 ,  Issue: 3 )

Date of Publication:

March 2010

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