Title :
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
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;
Conference_Titel :
Microwave Symposium Digest, 2009. MTT '09. IEEE MTT-S International
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-2803-8
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2009.5165941
