Title :
Low phase noise gm-boosted differential Colpitts VCO with suppressed AM-to-FM conversion
Author :
Hong, Jong-Phil ; Lee, Sang-Gug
Author_Institution :
Dept. of ICC, Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon, South Korea
Abstract :
A gm-boosted differential Colpitts VCO is proposed, which allows lower oscillation start-up current and suppressed AM-to-FM conversion by the switching transistors. The proposed architecture allows wider range of saturation mode operation for the switching transistors which helps to suppress the AM-to-FM conversion. The proposed VCO is implemented in 0.18-mum CMOS for 1.75~1.93 GHz operation. Measurement shows, at 1.84 GHz, the phase noise of -105 and -128 dBc/Hz (FOM = 191.2) at 100-KHz and 1-MHz offset, respectively, while dissipating 1.8 mA from 0.9-V supply.
Keywords :
CMOS integrated circuits; voltage-controlled oscillators; AM-to-FM conversion suppression; CMOS; current 1.8 mA; frequency 1 MHz; frequency 1.75 GHz to 1.93 GHz; frequency 100 kHz; gm-boosted differential Colpitts VCO; low phase noise oscillator; size 0.18 mum; switching transistors; voltage 0.9 V; Degradation; Feedback; Noise measurement; Phase measurement; Phase noise; Power dissipation; Tail; Transistors; Voltage; Voltage-controlled oscillators;
Conference_Titel :
Radio Frequency Integrated Circuits Symposium, 2009. RFIC 2009. IEEE
Conference_Location :
Boston, MA
Print_ISBN :
978-1-4244-3377-3
Electronic_ISBN :
1529-2517
DOI :
10.1109/RFIC.2009.5135534
