W -Band (92-100 GHz) Phased-Array Receive Channel With Quadrature-Hybrid-Based Vector Modulator

This paper presents a W -band (92-100 GHz) phased array receive channel adopting a power domain vector modulator (VM), which utilizes a 90° hybrid-coupler-based phase interpolator. The quadrature hybrid leverages its inherent functions of quadrature phase splitting and power combining to interpolat...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2018-07, Vol.65 (7), p.2070-2082
Main Authors: Afroz, Sadia, Koh, Kwang-Jin
Format: Article
Language:English
Subjects:
BiCMOS
Couplers
Gain
Hybrid coupler
Hybrid power systems
Interpolation
phase interpolator
Phase modulation
phase shifter
phased array
Phased arrays
Switches
vector modulator
W-band
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Summary:This paper presents a W -band (92-100 GHz) phased array receive channel adopting a power domain vector modulator (VM), which utilizes a 90° hybrid-coupler-based phase interpolator. The quadrature hybrid leverages its inherent functions of quadrature phase splitting and power combining to interpolate phases by combining the weighted signals from variable gain amplifiers in the power domain. Compared with prior active VMs, in the proposed VM, the phases are synthesized in a pure passive network with a matched impedance, less vulnerable to circuit nonlinearity. The distributed 90°-hybrid coupler offers a wideband operation of quadrature phasing and phase interpolation, resulting in a low phase error over the W -band. The measured VM peak-to-peak gain variation for all 5-bit phase states is 7.7-11 dB at the expense of 31-mW dc power from 2.2-V supply voltage. The measured rms gain error is
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2017.2779941