DocumentCode :
1014984
Title :
A low phase-noise CMOS VCO with harmonic tuned LC tank
Author :
Kim, Huijung ; Ryu, Seonghan ; Chung, Yujin ; Choi, Jinsung ; Kim, Bumman
Author_Institution :
Dept. of Electr. Eng., Pohang Inst. of Sci. & Technol., South Korea
Volume :
54
Issue :
7
fYear :
2006
fDate :
7/1/2006 12:00:00 AM
Firstpage :
2917
Lastpage :
2924
Abstract :
This paper presents a phase-noise reduction technique for voltage-controlled oscillators (VCOs) using a harmonic tuned (HT) LC tank. The phase-noise suppression is achieved through almost rectangular-shaped voltage at the switching differential cell, which effectively maximizes the slope of the switching cell output voltage at a zero crossing point. In addition, the proposed technique also suppresses the down-conversion of the noise around the second harmonic frequency by the second harmonic short of the tank. One second HT VCO and two third HT VCOs are designed and implemented to evaluate the concept using a 0.35- and 0.13-μm CMOS process. The figure-of-merit (FOM) of the second HT VCO, third HT VCO1, and third HT VCO2 are -180.7, -183.7, and -189.5, respectively. The best FOM performance of the VCO has phase noises of -100.4, -132.0, and -140.8dBc/Hz at 100-kHz, 1-MHz, and 3-MHz offset frequencies at the 2-GHz carrier, respectively. This VCO consumes 3.29 mA from a 1.8-V supply with the silicon area of 500 μm×750 μm.
Keywords :
CMOS integrated circuits; UHF oscillators; phase noise; voltage-controlled oscillators; 0.13 micron; 0.35 micron; 1.8 V; 2 GHz; 3.29 mA; 500 micron; 750 micron; CMOS process; harmonic tuned LC tank; phase-noise suppression; rectangular-shaped voltage; second harmonic frequency; switching cell output voltage; switching differential cell; voltage-controlled oscillators; zero crossing point; 1f noise; CMOS technology; Companies; Frequency; Information technology; Phase noise; Semiconductor device noise; Silicon; Voltage-controlled oscillators; Zero voltage switching; CMOS; harmonic tuned (HT) LC tank; low phase noise; voltage-controlled oscillator (VCO);
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2006.877439
Filename :
1650429
Link To Document :
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