Paper Info
Title
Design of Lumped-Component Programmable Delay Elements for Ultra-Wideband Beamforming
Abstract
We introduce a ladder filter-based programmable time-delay element for beamforming in ultra-wideband (UWB) systems. Such a lumped-element realization becomes possible by approximating e-std as a ratio of polynomials (based on Taylor and Padé expansions). When compared with conventional methods based on the tapped delay-line architecture, the proposed technique achieves lower power dissipation, higher delay range and resolution, and better area efficiency. A prototype delay line designed for the 3.1-10.6 GHz UWB range achieves a delay range of 140 ps and a gain range of -30 dB to +10 dB. Fabricated in a 0.25 μm SiGe BiCMOS process, the delay element occupies an active area of 1 mm2 and consumes 53 mW from a 2.5 V supply. A four-antenna beamforming system using the delay element can achieve a scanning range of ±61° with 0.86 ° resolution for an antenna spacing of 15 mm.
Year
DOI
Venue
2014
10.1109/JSSC.2014.2317132
Solid-State Circuits, IEEE Journal of  
Keywords
DocType
Volume
BiCMOS analogue integrated circuits,Ge-Si alloys,antenna arrays,array signal processing,delay lines,lumped parameter networks,polynomial approximation,ultra wideband communication,Pade expansion,SiGe,SiGe BiCMOS process,Taylor expansion,UWB systems,four-antenna beamforming system,frequency 3.1 GHz to 10.6 GHz,gain -30 dB to 10 dB,ladder filter,lumped-component programmable delay elements,lumped-element realization,polynomials,power 53 mW,power dissipation,size 0.25 mum,tapped delay-line architecture,ultrawideband beamforming,voltage 2.5 V,All-pass filters,LC ladder,Padé approximation,beamforming,delay circuits,imaging,programmable filters,radar,true-time delay (TTD),ultra-wideband (UWB)
Journal
49
Issue
ISSN
Citations 
8
0018-9200
1
PageRank 
References 
Authors
0.35
0
2
Name
Order
Citations
PageRank
Naga Rajesh110.35
Shanthi Pavan239187.81