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

Author

Yang, Jaemo ; Kim, Choul-Young ; Kim, Dong-Wook ; Hong, Songcheol

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea

Volume

57

Issue

3

fYear

2010

fDate

3/1/2010 12:00:00 AM

Firstpage

173

Lastpage

177

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

CMOS analogue integrated circuits; MMIC oscillators; feedback oscillators; field effect MMIC; low-power electronics; nonlinear network synthesis; transformers; voltage-controlled oscillators; K-band CMOS voltage-controlled oscillator; Q-factor; asymmetric-width transformer; asymmetric-width transformers; frequency 24 GHz; low supply voltage operation; phase noise; power 7.8 mW; radio frequency CMOS process; size 0.18 mum; transformer-feedback VCO; transformer-feedback topology; voltage 0.65 V; Asymmetric-width transformer; low voltage; transformer feedback; voltage-controlled oscillators (VCOs);

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2010.2043381

Filename

5431018