A 0.18μm CMOS fully integrated RFDAC and VGA for WCDMA transmitters

Author

Taleie, Shahin Mehdizad ; Han, Yongping ; Copani, Tino ; Bakkaloglu, Bertan ; Kiaei, Sayfe

Author_Institution

Qualcomm, Inc., San Diego, CA

fYear

2008

fDate

June 17 2008-April 17 2008

Firstpage

157

Lastpage

160

Abstract

A digital IF to RF converter architecture with an RF VGA targeted for WCDMA transmitters is presented. The RFDAC consists of a 1.5-bits current steering DAC with an embedded semi-digital FIR filter and a mixer with an LC load. The VGA controls the output power in 10 dB steps. The prototype is fabricated in 0.18 mum CMOS technology and achieves 0 dBm output power at 2 GHz and 33 dB image rejection. The measured rms EVM and ACPR show the system fulfills the standard specifications for the WCDMA. The chip draws 123.9 mA from 1.8 V supply. The die area is 0.8 times 1.6 mm².

Keywords

CMOS integrated circuits; UHF amplifiers; UHF integrated circuits; broadband networks; code division multiple access; digital-analogue conversion; radio transmitters; CMOS fully integrated RFDAC; LC load; VGA; WCDMA transmitter; current 123.9 mA; current steering DAC; digital-to- analog converter; embedded semi-digital FIR filter; frequency 2 GHz; size 0.18 mum; variable gain amplifier; voltage 1.8 V; CMOS technology; Circuits; Finite impulse response filter; Jitter; Linearity; Multiaccess communication; Power generation; Quantization; Radio frequency; Radio transmitters; CMOS; VGA; WCDMA; digital to analog converters; linearity; transmitter;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Frequency Integrated Circuits Symposium, 2008. RFIC 2008. IEEE

Conference_Location

Atlanta, GA

ISSN

1529-2517

Print_ISBN

978-1-4244-1808-4

Electronic_ISBN

1529-2517

Type

conf

DOI

10.1109/RFIC.2008.4561408

Filename

4561408