A 5-GHz CMOS quadrature modulator for direct conversion transmitters

Author

Hao, Wen-Hu

Author_Institution

Winbond Electron. Ltd., Shanghai

Volume

1

fYear

2005

fDate

24-0 Oct. 2005

Firstpage

493

Lastpage

496

Abstract

A direct up-conversion quadrature modulator operating for the 5-GHz wireless LAN system is presented. As the key component in the transmitter, the doubly balanced quadrature modulator was designed and fabricated in a 0.18mum CMOS process. To improve the linearity of the quadrature modulator, a negative feedback technique is adopted in the transconductor design. The modulator chip consumes only 8mA with 1.8V supply voltage. The measured single end input 1-dB compression point is larger than -0.45dBV. The quadrature modulator has the accordant performance at 5-GHz with the process and temperature variations

Keywords

CMOS integrated circuits; circuit feedback; modulators; radio transmitters; wireless LAN; 0.18 micron; 1.8 V; 5 GHz; 8 mA; CMOS quadrature modulator; direct conversion transmitters; negative feedback; transconductor design; wireless LAN system; Band pass filters; CMOS technology; Circuits; Energy consumption; Linearity; RF signals; Radio frequency; Transconductors; Transmitters; Wireless LAN; CMOS; Direct Up-Conversion Transmitter; Quadrature Modulator; Transconductor;

fLanguage

English

Publisher

ieee

Conference_Titel

ASIC, 2005. ASICON 2005. 6th International Conference On

Conference_Location

Shanghai

Print_ISBN

0-7803-9210-8

Type

conf

DOI

10.1109/ICASIC.2005.1611365

Filename

1611365