Experimental Analysis of a 60 GHz Compact EC-CPW Branch-Line Coupler for mm-Wave CMOS Radios

Author

Haroun, Ibrahim ; Wight, Jim ; Plett, Calvin ; Fathy, Aly ; Chang, Da-Chiang

Author_Institution

Commun. Res. Centre Canada, Ottawa, ON, Canada

Volume

20

Issue

4

fYear

2010

fDate

4/1/2010 12:00:00 AM

Firstpage

211

Lastpage

213

Abstract

A 60 GHz reduced-size branch-line coupler has been developed using elevated-center coplanar waveguide (EC-CPW) transmission lines. The coupler is fabricated in a 90 nm CMOS technology and has a chip area of 0.102 mm². The measurements indicated an amplitude-imbalance of 0.7 dB and a phase difference of 88 degrees at 60 GHz, a return loss of greater than 15 dB at every port over the 60 GHz band (57-64 GHz), and an isolation better than 17 dB. A 73% size-reduction compared to a conventional CPW coupler design has been achieved using capacitively loaded high-impedance EC-CPW lines. The proposed coupler is well suited for the design of millimeter-wave (mmW) CMOS subsystems including: balanced amplifiers, vector modulators, and balanced mixers.

Keywords

CMOS integrated circuits; coplanar waveguides; differential amplifiers; field effect MIMIC; millimetre wave mixers; radiocommunication; waveguide couplers; CMOS technology; balanced amplifiers; balanced mixers; capacitively loaded high-impedance EC-CPW lines; compact EC-CPW branch-line coupler; elevated-center coplanar waveguide transmission lines; frequency 60 GHz; millimeter-wave CMOS subsystem design; mm-wave CMOS radios; size 90 nm; vector modulators; 60 GHz band; Branch-line coupler; coplanar waveguide (CPW); millimeter-wave CMOS; transmission lines;

fLanguage

English

Journal_Title

Microwave and Wireless Components Letters, IEEE

Publisher

ieee

ISSN

1531-1309

Type

jour

DOI

10.1109/LMWC.2010.2042554

Filename

5422762