Design of a 24-GHz CMOS VCO With an Asymmetric-Width Transformer
- 15 March 2010
- journal article
- research article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Circuits and Systems II: Express Briefs
- Vol. 57 (3), 173-177
- https://doi.org/10.1109/tcsii.2010.2043381
Abstract
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.Keywords
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