A Dual-Band CMOS CDMA Transmitter Without External SAW Filtering

Author

Farazian, Mohammad ; Asuri, Bhushan ; Larson, Lawrence E.

Author_Institution

Qualcomm Inc., San Diego, CA, USA

Volume

58

Issue

5

fYear

2010

fDate

5/1/2010 12:00:00 AM

Firstpage

1349

Lastpage

1358

Abstract

A SAW-less dual-band I/Q transmitter without a driver amplifier is designed for dual-band (personal communication system (PCS)/International Mobile Telecommunications (IMT) and cellular) code division multiple access applications. The receive band noise is less than -159 dBc/Hz. It can provide up to + 5-dBm output power and meets the adjacent channel power ratio and dynamic range requirements of both PCS/IMT and cellular CDMA. The measured S ₂₂ is better than -10 dB for both bands and it requires no external matching components. The transmitter is implemented in a 65-nm digital CMOS technology and is packaged using flip-chip technology. The transmitter signal path (RF portion) occupies 1.0 mm².

Keywords

CMOS integrated circuits; code division multiple access; radio transmitters; surface acoustic wave filters; CDMA transmitter; SAW filtering; SAW-less dualband IQ transmitter; code division multiple access; dual band CMOS transmitter; flip chip technology; surface acoustic wave; Adjacent channel power ratio (ACPR); SAW-less transmitter; code division multiple access (CDMA); driver amplifier; gain control; local oscillator (LO) leakage; mixer; single-sideband (SSB) mixer; surface acoustic wave (SAW) filter; switched-LO mixer; upconverter;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2010.2042851

Filename

5443581