DocumentCode :
3562435
Title :
A new class of low phase noise vackar VCO in CMOS technology
Author :
Jong-Wook Lee ; Gul, Muhammad Talha ; Nguyen, Tai Nghia
Author_Institution :
Sch. of Electron. & Inf., Kyung Univ., Suwon, South Korea
fYear :
2014
Firstpage :
23
Lastpage :
26
Abstract :
In this paper, we present differential Vackar voltage-controlled oscillator (VCO) implemented for the first time in CMOS technology. The Vackar VCO provides good isolation between LC tank and loss-compensating active circuit; thus, excellent frequency stability is achieved over the frequency tuning range. Simple analysis and simulations examine the transistor loading effect and amplitude stability. Results indicate that the Vackar VCO has improved amplitude stability compared to the Colpitts VCO. The improved amplitude stability is favorable for suppressing amplitude-to-phase (AM/PM) noise conversion. Two Vackar VCOs were fabricated to examine their phase noise. C-band Vackar VCO implemented in 0.18 μm RF CMOS shows oscillation frequency ranged from 4.85 to 4.93 GHz. The measured phase noise of the C-band Vackar VCO is -124.9 dB/Hz from 1 MHz offset at 4.9 GHz with a figure-of-merit (FOM) of -188 dBc/Hz. K-band Vackar VCO with gate inductive feedback is implemented in a 0.13 μm RF CMOS process. The oscillation frequency ranges from 19 to 19.95 GHz. The measured phase noise is -103 dBc/Hz from 1 MHz offset at 19.5 GHz with FOM of -182 dBc/Hz.
Keywords :
CMOS integrated circuits; MMIC oscillators; field effect MMIC; phase noise; voltage-controlled oscillators; C-band Vackar VCO; CMOS technology; K-band Vackar VCO; LC tank; RF CMOS process; amplitude stability; amplitude-phase noise conversion supression; differential Vackar voltage controlled oscillator; frequency 19 GHz to 19.95 GHz; frequency 4.85 GHz to 4.93 GHz; frequency stability; loss-compensating active circuit; low phase noise Vackar VCO; size 0.13 mum; size 0.18 mum; CMOS integrated circuits; Circuit stability; Noise measurement; Phase noise; Stability analysis; Tuning; Voltage-controlled oscillators;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Advanced Technologies for Communications (ATC), 2014 International Conference on
Print_ISBN :
978-1-4799-6955-5
Type :
conf
DOI :
10.1109/ATC.2014.7043349
Filename :
7043349
Link To Document :
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