A K-band CMOS low power modified colpitts VCO using transformer feedback

Author

Hsieh, Chi-Kai ; Kao, Kun-Yao ; Tseng, Jeffrey Ronald ; Lin, Kun-You

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan

fYear

2009

fDate

7-12 June 2009

Firstpage

1293

Lastpage

1296

Abstract

A K-band low-power, low phase noise modified Colpitts VCO was implemented in 0.13 mum CMOS process. The timed current switches of the conventional Colpitts VCO are replaced by a differential transformer, and thus the supply voltage of the proposed VCO can be reduced. The VCO has -100 and -109.5 dBc/Hz phase noises at 1 MHz offset under 4 and 10 mW dc power consumptions, respectively. The chip size is 570 times 570 mum².

Keywords

CMOS integrated circuits; MMIC oscillators; differential transformers; field effect MMIC; low-power electronics; phase noise; voltage-controlled oscillators; CMOS; Colpitts oscillator; K-band low power VCO; differential transformer; low phase noise; modified Colpitts VCO; power 10 mW; power 4 mW; size 0.13 mum; supply voltage; transformer feedback; Circuits; Energy consumption; Feedback; Frequency; K-band; Phase noise; Power engineering and energy; Switches; Transceivers; Voltage-controlled oscillators; CMOS; Colpitts oscillator; VCO; transformer;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2009. MTT '09. IEEE MTT-S International

Conference_Location

Boston, MA

ISSN

0149-645X

Print_ISBN

978-1-4244-2803-8

Electronic_ISBN

0149-645X

Type

conf

DOI

10.1109/MWSYM.2009.5165941

Filename

5165941