Title :
CMRR analysis for a wideband passive monolithic differential quadrature coupler implemented using GaAs process
Author :
Hamed, Karim W. ; Freundorfer, Alois P. ; Antar, Y.M.M.
Author_Institution :
Queen´´s Univ., Kingston
Abstract :
This paper presents the performance characteristics along with the common mode rejection ratio (CMRR) analysis of a broadband passive quadrature differential coupler implemented using GaAs technology. The coupler utilizes a multi- dielectric layer structure to achieve a broadband performance from 15 to 45 GHz in a simple coplanar configuration. A return loss better than 12 dB with isolation better than 15 dB and CMRR of 20 dB have been achieved over the entire frequency band. Also phase and amplitude mismatch within +5deg and 1.5 dB, respectively have been realized over the same frequency range. This performance is especially important to the intended use with wideband double balanced mixers, and amplifiers. A slow-wave mechanism was also introduced to the coupler and has led to 14% reduction in the coupled length.
Keywords :
III-V semiconductors; electric connectors; gallium arsenide; microwave mixers; CMRR analysis; GaAs; GaAs technology; amplifiers; broadband passive monolithic quadrature differential coupler; common mode rejection ratio analysis; frequency 14 GHz to 45 GHz; multidielectric layer structure; return loss; slow-wave mechanism; wideband double balanced mixers; Broadband amplifiers; Conducting materials; Conductors; Coupling circuits; Frequency; Gallium arsenide; Microwave circuits; Performance analysis; Strips; Wideband; MMIC; Quadrature couplers; differential circuits; passive devices;
Conference_Titel :
Microwave Conference, 2006. APMC 2006. Asia-Pacific
Conference_Location :
Yokohama
Print_ISBN :
978-4-902339-08-6
Electronic_ISBN :
978-4-902339-11-6
DOI :
10.1109/APMC.2006.4429534