Title :
A wide-band GaAs monolithic spiral quadrature hybrid and its circuit applications
Author :
Ali, Fazal ; Podell, Allen
Author_Institution :
Pacific Monolithics, Sunnyvale, CA, USA
fDate :
10/1/1991 12:00:00 AM
Abstract :
The design, performance, and circuit applications of a 2-6-GHz GaAs monolithic spiral quadrature coupler are presented. This 90° coupler uses lumped spiral inductors and metal-insulator-metal (MIM) capacitors and is very small in size (14 mil×26 mil). The measured relative phase difference between the coupled and direct port over the 3:1 bandwidth was 93°±6°. Applications of this broadband hybrid in reflection phase-shifter, image-reject downconverter, and I-Q downconverter circuits have also been successfully demonstrated based on this structure
Keywords :
III-V semiconductors; MMIC; frequency convertors; gallium arsenide; metal-insulator-metal devices; waveguide couplers; 2.6 GHz; GaAs; I-Q downconverter circuits; MIM capacitors; circuit applications; image-reject downconverter; lumped spiral inductors; reflection phase-shifter; relative phase difference; spiral quadrature coupler; Bandwidth; Coupling circuits; Gallium arsenide; Inductors; MIM capacitors; Metal-insulator structures; Phase measurement; Reflection; Spirals; Wideband;
Journal_Title :
Solid-State Circuits, IEEE Journal of
