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Digitally Controlled Phase Shifters and True Time Delays at Radio Frequencies /

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Digitally Controlled Phase Shifters and True Time Delays at Radio Frequencies // Diba Dehmeshki.
Author:	Dehmeshki, Diba,
Description:	1 electronic resource (123 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-01, Section: B.
Contained By:	Dissertations Abstracts International86-01B.
Subject:	Electrical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31331991
ISBN:	9798383220962

Digitally Controlled Phase Shifters and True Time Delays at Radio Frequencies /
Dehmeshki, Diba,

Digitally Controlled Phase Shifters and True Time Delays at Radio Frequencies /Diba Dehmeshki. - 1 electronic resource (123 pages)

Source: Dissertations Abstracts International, Volume: 86-01, Section: B.

This study offers presents a comprehensive examination of digitally controlled phase shifters and true time delays, highlighting their critical roles in beamforming networks within communication systems, radar technology, satellite systems, and precision timing measurements, which are essential in particle physics. Precision timing measurements will be a key tool at the HL-LHC, used to suppress pile-up and search for long-lived particles. To control a reference clock with sub-picosecond accuracy, we fabricated a digitally controlled phase shifter using the TSMC 65nm process. This phase shifter comprises a chain of 66 cells, each with a digitally controlled coplanar waveguide that provides either a short or long delay, allowing phase control of a reference clock to a precision of 200 fs with a dynamic range of 12 ps.In another project, we developed a digitally controlled phase delay with a step of 280 femtoseconds and a dynamic range of 230 picoseconds. This increase in delay range is achieved by using an LC circuit for coarse delay along with a series of coplanar waveguides for fine delay. The design details, simulations, and comparisons with laboratory measurements are discussed, demonstrating how this ASIC stabilizes a digital clock to a precision of less than one picosecond.We also introduce an integrated microwave true time delay (TTD) phase shifter with active amplitude control for wireless front-ends. This phase control uses distributed digital manipulation of wave propagation in an artificial transmission line. A chip prototype developed using the TSMC 65nm process achieves a group delay resolution of 0.28 ps and a loss variation under 1 dB. Active tuning provides up to 15 dB of amplitude modulation and reverse isolation of 27 dB or better throughout the Ku-band. This structure supports broadband linear delay control across multiband phased arrays.In our final segment, we propose a novel approach to phase shifter design that moves away from traditional binary and uniform phase steps. This section compares uniform and binary step designs, showing that while uniform steps minimize phase error, they also lead to higher losses and require more space. By using non-binary and non-uniform delay blocks, our designs achieve a balance of low phase error without significant losses. Detailed simulation results challenge existing paradigms in phase shifter design and demonstrate potential for enhanced performance within specific frequency ranges, marking an advancement in the field.

English

ISBN: 9798383220962Subjects--Topical Terms:

596380
Electrical engineering.
Subjects--Index Terms:

Phase shifters

Digitally Controlled Phase Shifters and True Time Delays at Radio Frequencies /
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300 $a 1 electronic resource (123 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 86-01, Section: B.
500 $a Advisors: Tousi, Yahya Committee members: Franklin, Rhonda; Harjani, Ramesh; Rusack, Roger.
502 $b Ph.D. $c University of Minnesota $d 2024.
520 $a This study offers presents a comprehensive examination of digitally controlled phase shifters and true time delays, highlighting their critical roles in beamforming networks within communication systems, radar technology, satellite systems, and precision timing measurements, which are essential in particle physics. Precision timing measurements will be a key tool at the HL-LHC, used to suppress pile-up and search for long-lived particles. To control a reference clock with sub-picosecond accuracy, we fabricated a digitally controlled phase shifter using the TSMC 65nm process. This phase shifter comprises a chain of 66 cells, each with a digitally controlled coplanar waveguide that provides either a short or long delay, allowing phase control of a reference clock to a precision of 200 fs with a dynamic range of 12 ps.In another project, we developed a digitally controlled phase delay with a step of 280 femtoseconds and a dynamic range of 230 picoseconds. This increase in delay range is achieved by using an LC circuit for coarse delay along with a series of coplanar waveguides for fine delay. The design details, simulations, and comparisons with laboratory measurements are discussed, demonstrating how this ASIC stabilizes a digital clock to a precision of less than one picosecond.We also introduce an integrated microwave true time delay (TTD) phase shifter with active amplitude control for wireless front-ends. This phase control uses distributed digital manipulation of wave propagation in an artificial transmission line. A chip prototype developed using the TSMC 65nm process achieves a group delay resolution of 0.28 ps and a loss variation under 1 dB. Active tuning provides up to 15 dB of amplitude modulation and reverse isolation of 27 dB or better throughout the Ku-band. This structure supports broadband linear delay control across multiband phased arrays.In our final segment, we propose a novel approach to phase shifter design that moves away from traditional binary and uniform phase steps. This section compares uniform and binary step designs, showing that while uniform steps minimize phase error, they also lead to higher losses and require more space. By using non-binary and non-uniform delay blocks, our designs achieve a balance of low phase error without significant losses. Detailed simulation results challenge existing paradigms in phase shifter design and demonstrate potential for enhanced performance within specific frequency ranges, marking an advancement in the field.
546 $a English
590 $a School code: 0130
650 4 $a Electrical engineering. $3 596380
650 4 $a Computer engineering. $3 569006
653 $a Phase shifters
653 $a Radio frequencies
653 $a True time delays
653 $a Satellite systems
653 $a Beamforming networks
690 $a 0544
690 $a 0464
710 2 $a University of Minnesota. $b Electrical Engineering. $3 1148492
720 1 $a Tousi, Yahya $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-01B.
790 $a 0130
791 $a Ph.D.
792 $a 2024
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31331991