NDLI: Compact 41–93 GHz symmetric quadrature hybrid based on multi-conductor coupled line in 65 nm CMOS process

Content Provider	IET Digital Library
Author	Chen, Zhe Fan, Kuikui
Abstract	The development of a compact 41–93 GHz symmetric quadrature hybrid based on multi-conductor coupled lines in standard 65 nm bulk CMOS process is presented. The equivalent two-line model of the multi-conductor coupled line is derived and analysed with even/odd mode theory and ABCD matrix. With the multi-conductor coupled-line sections, high coupling coefficient, compact size, and wideband operation can be realised; meanwhile, keeping the responses of four ports fully symmetric, which is suitable for circuit applications demanding port symmetry. Designed compact symmetric quadrature hybrid is implemented with 65 nm bulk CMOS process. Measured results show the CMOS quadrature hybrid has good phase difference within 90 ± 2.5° and amplitude balance <±0.5 dB from 41 to 93 GHz, or a 75.5% fractional bandwidth, with an extremely compact size of 93 µm × 149 µm (0.0138 mm2), or 0.051λ 0 × 0.024λ 0.
Starting Page	1074
Ending Page	1076
Page Count	3
ISSN	00135194
Volume Number	54
e-ISSN	1350911X
Issue Number	Issue 18, Sep (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/54/18
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2018.5067
Journal	Electronics Letters
Publisher Date	2018-08-06
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	ABCD Matrix Algebra Circuit Application CMOS Integrated Circuit CMOS Quadrature Hybrid Compact Size Compact Symmetric Quadrature Hybrid Multiconductor Coupled Line Coupled Circuit Coupled Transmission Line Even-odd Mode Theory Field Effect MIMIC Frequency 41.0 GHz to 93.0 GHz High Coupling Coefficient Matrix Algebra Microwave IC Multiconductor Transmission Line Port Symmetry Size 65 Nm Standard Bulk CMOS Process Two-line Model Waveguide And Microwave Transmission Line Component Wideband Operation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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