A 5 GHz transformer-coupled shifting CMOS VCO using bias-level technique

Author

Song, Taeksang ; Ko, Sangsoo ; Cho, Dae-Hyung ; Oh, Han-Su ; Chung, Chulho ; Yoon, Euisik

Author_Institution

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

fYear

2004

fDate

6-8 June 2004

Firstpage

127

Lastpage

130

Abstract

We report a low phase noise transformer-coupled CMOS VCO using a bias-level shifting technique. Two fully integrated voltage-controlled oscillators (VCOs) are presented as a proof of concept. A conventional LC VCO with a current source achieves a phase noise of -116.67 dBc/Hz at 1 MHz offset from the 5.6 GHz center frequency, taking 3.9 mA from a 1.5 V power supply. The proposed transformer-coupled VCO achieves a phase noise of -124.17 dBc/Hz at 1 MHz offset from a 5.8 GHz carrier frequency with 5.1 mA bias current from 1.5 V power supply. The VCO performances are compared with previously reported CMOS VCOs in the range of 4-6 GHz oscillation frequencies.

Keywords

CMOS analogue integrated circuits; integrated circuit design; phase noise; radiofrequency integrated circuits; transceivers; voltage-controlled oscillators; 1.5 V; 3.9 mA; 4 to 6 GHz; 5.1 mA; RF design; RFIC; bias-level shifting technique; current source; on-chip transceivers; phase noise; transformer-coupled CMOS VCO; transformer-coupled VCO; voltage-controlled oscillators; Circuit faults; Degradation; Phase noise; Power supplies; Q factor; Radio frequency; Tail; Transceivers; Voltage; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency Integrated Circuits (RFIC) Symposium, 2004. Digest of Papers. 2004 IEEE

ISSN

1529-2517

Print_ISBN

0-7803-8333-8

Type

conf

DOI

10.1109/RFIC.2004.1320547

Filename

1320547