Design and applications of a 3:1 bandwidth GaAs monolithic spiral quadrature hybrid

Author

Ali, F. ; Podell, A.

Author_Institution

Pacific Monolithics, Sunnyvale, CA, USA

fYear

1990

fDate

7-10 Oct. 1990

Firstpage

279

Lastpage

282

Abstract

The design, performance, and circuit applications of a 2-6-GHz GaAs monolithic spiral quadrature coupler are presented. The 90-degree coupler uses lumped spiral inductors and MIM capacitors and is very small in size (14 mils*26 mils). The mutually coupled inductors were realized using a bifilar spiral transformer to achieve a coupling coefficient of k=0.7 and to reduce chip size. The measured relative phase difference between the coupled and direct ports over the 3:1 bandwidth is 90+or-6 degrees. Results on a hybrid-coupled reflection phase shifter and an image-reject downconverter based on this monolithic quadrature hybrid are also presented.<>

Keywords

III-V semiconductors; MMIC; gallium arsenide; waveguide couplers; 2 to 6 GHz; GaAs; MIM capacitors; SHF; bifilar spiral transformer; circuit applications; hybrid-coupled reflection phase shifter; image-reject downconverter; lumped spiral inductors; monolithic spiral quadrature hybrid; mutually coupled inductors; quadrature coupler; Bandwidth; Coupling circuits; Gallium arsenide; Inductors; MIM capacitors; Mutual coupling; Phase measurement; Phase transformers; Semiconductor device measurement; Spirals;

fLanguage

English

Publisher

ieee

Conference_Titel

Gallium Arsenide Integrated Circuit (GaAs IC) Symposium, 1990. Technical Digest 1990., 12th Annual

Conference_Location

New Orleans, LA, USA

Type

conf

DOI

10.1109/GAAS.1990.175507

Filename

175507