A fully differential LC-VCO using a new varactor control structure

Author

Hyunwon Moon ; Sungweon Kang ; Youn Tae Kim ; Kwyro Lee

Author_Institution

Dept. of Electr. Eng. & Comput. Sci., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea

Volume

14

Issue

9

fYear

2004

Firstpage

410

Lastpage

412

Abstract

This paper presents a fully differential inductor-capacitor voltage-controlled oscillator (LC-VCO) with a new differentially-tuned varactor structure. The proposed LC-VCO has lower phase noise and better robustness to the injected common-mode noise than the differentially-tuned LC-VCO using the previous antiparallel structure. The LC-VCO implemented using 0.5-μm SiGe BiCMOS technology is tunable from 4.251 to 4.428 GHz and the measured phase noise is -119 dBc/Hz at 1-MHz offset over the entire tuning range. Its core current is only 1.7 mA at 2.5-V supply voltage.

Keywords

BiCMOS integrated circuits; Ge-Si alloys; MMIC oscillators; phase noise; varactors; voltage-controlled oscillators; 0.5 micron; 1.7 mA; 2.5 V; 4.251 to 4.428 GHz; SiGe; SiGe BiCMOS technology; differential LC-VCO; differentially-tuned varactor structure; inductor-capacitor voltage-controlled oscillator; injected common-mode noise; phase noise; varactor control structure; BiCMOS integrated circuits; Germanium silicon alloys; Noise measurement; Noise robustness; Phase measurement; Phase noise; Silicon germanium; Tuning; Varactors; Voltage-controlled oscillators;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2004.832061

Filename

1324731