Title :
A low-phase-noise and wide-tuning-range LC digital controlled oscillator
Author :
Hongtao Qi ; Yuan Wang ; Song Jia ; Ganggang Zhang ; Xing Zhang
Author_Institution :
Shenzhen Grad. Sch., Peking Univ., Shenzhen, China
Abstract :
This paper presents a low-phase-noise and wide-tuning-range LC digital controlled oscillator (DCO). With six control words, the DCO obtains 0.8 GHz tuning range. This structure adopts two important technologies to suppress the phase noise. Using an LC noise filter at the source of the cross-coupled pMOS, it suppresses the second harmonic frequency noise. And a tail current-shaping technology is used to ensure the current peak align with the output voltage peak. The LC DCO is fabricated in SMIC 65nm CMOS technology. The proposed DCO exhibits an average phase noise of -127 dBc/Hz at 1 MHz offset from 2.35 GHz to 3.15 GHz carriers.
Keywords :
CMOS analogue integrated circuits; LC circuits; MMIC oscillators; UHF filters; UHF integrated circuits; UHF oscillators; harmonics suppression; integrated circuit design; integrated circuit noise; microwave filters; phase noise; DCO; LC noise filter; SMIC CMOS technology; cross-coupled pMOS; current peak align; frequency 0.8 GHz; frequency 2.35 GHz to 3.15 GHz; low-phase-noise; output peak; second harmonic frequency noise suppression; size 65 nm; tail current-shaping technology; wide-tuning-range LC digital controlled oscillator; Abstracts; Capacitors;
Conference_Titel :
Solid-State and Integrated Circuit Technology (ICSICT), 2014 12th IEEE International Conference on
Conference_Location :
Guilin
Print_ISBN :
978-1-4799-3296-2
DOI :
10.1109/ICSICT.2014.7021515
