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Enhanced Frequency-Selective N-Path Filters and Receivers.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Enhanced Frequency-Selective N-Path Filters and Receivers.
Author:	Ellington, Cody Jackson.
Published:	Ann Arbor : ProQuest Dissertations & Theses, 2023
Description:	231 p.
Notes:	Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
Notes:	Advisor: Floyd, Brian.
Contained By:	Dissertations Abstracts International85-05B.
Subject:	Circuits.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30673669
ISBN:	9798380713528

Enhanced Frequency-Selective N-Path Filters and Receivers.
Ellington, Cody Jackson.

Enhanced Frequency-Selective N-Path Filters and Receivers. - Ann Arbor : ProQuest Dissertations & Theses, 2023 - 231 p.

Source: Dissertations Abstracts International, Volume: 85-05, Section: B.

Thesis (Ph.D.)--North Carolina State University, 2023.

This item must not be sold to any third party vendors.

The reflection-mode N-path filter (RMNF) is a possible solution to the growing demand for digitally reconfigurable, software-defined, widely-tunable, and integrated filters. While such filtering solutions exist below 12GHz, there are no solutions that meet these requirements existing above 12GHz. Such filters are needed to protect emerging wideband digital beamforming systems from interference that would corrupt industrial and defense communications. Thus, fundamental research is needed to advance the state of the art in filtering solutions for next-generation wireless communication systems.The first key contribution of this research is to demonstrate techniques that can narrow the bandwidth of the transition-zone of a RMNF. The transition-zone is a frequency range over which the transmission response of the filter is changing from the passband with a specified insertion-loss to a stopband with a specified rejection level. To date, there are no widely tunable filtering solutions other than the RMNF above 12GHz. The current filter can be further improved by enhancing its frequency selectivity – this involves achieving wider bandwidths while simultaneously increasing the level of rejection.The second key contribution of this research is to demonstrate techniques to enhance the out-of-band rejection level of the RMNF. Our preliminary analysis shows that the level of rejection is constrained by the isolation of the 90-degree hybrid coupler. While there are current approaches to increasing the directivity of hybrid couplers, these approaches fail to address the wide-band requirement we have for our filtering application (10-50GHz). Thus, fundamental research is conducted and techniques to mitigate this coupler non-ideality are demonstrated.The third key contribution of this research is to demonstrate techniques to improve the spurious-free dynamic range (SFDR) of the RMNF. The noise contribution of the filter will fundamentally limit its usability in receiver applications since noise limits the sensitivity of a receiver. The introductions of nonlinearities in the filter will fundamentally limit its usability in transmitter applications since adjacent-channel leakage ratios constrain spurious emissions that can be present in wireless transmissions. The noise performance will set the floor of the SFDR and the linearity performance will set its ceiling. To make the RMNF more suitable for emerging communication applications, enhancements in both noise and linearity are demonstrated.The fourth key contribution of this research is to demonstrate how techniques utilized in the RMNF to increase its selectivity can be applied to N-path, or mixer-first, receivers, which also rely on N-path passive mixers. By cascading a RMNF and mixer-first receiver with enhanced selectivity, a widely-tunable, software-defined, frequency-selective receiver can be demonstrated above 6GHz. The cascaded system achieves sixth-order selectivity with greater than 800 MHz instantaneous RF bandwidth.Finally, this work demonstrates that for RMNF performance to be further improved, future research efforts need to focus on the following. Firstly, the leakage of the local oscillator (LO) signal from the mixer to the filter output needs to be reduced if the RMNF noise figure is to be minimized. Secondly, the power consumption of the RMNF (and RMNF and mixerfirst receiver cascade) need to be reduced for these circuits to be of practical use in emerging beamforming systems. Thirdly, techniques to calibrate the RMNF will need to be developed for robust filtering performance across a variety of process, voltage, and temperature diverse environments.

ISBN: 9798380713528Subjects--Topical Terms:

915682
Circuits.

Enhanced Frequency-Selective N-Path Filters and Receivers.
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245 1 0 $a Enhanced Frequency-Selective N-Path Filters and Receivers.
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300 $a 231 p.
500 $a Source: Dissertations Abstracts International, Volume: 85-05, Section: B.
500 $a Advisor: Floyd, Brian.
502 $a Thesis (Ph.D.)--North Carolina State University, 2023.
506 $a This item must not be sold to any third party vendors.
520 $a The reflection-mode N-path filter (RMNF) is a possible solution to the growing demand for digitally reconfigurable, software-defined, widely-tunable, and integrated filters. While such filtering solutions exist below 12GHz, there are no solutions that meet these requirements existing above 12GHz. Such filters are needed to protect emerging wideband digital beamforming systems from interference that would corrupt industrial and defense communications. Thus, fundamental research is needed to advance the state of the art in filtering solutions for next-generation wireless communication systems.The first key contribution of this research is to demonstrate techniques that can narrow the bandwidth of the transition-zone of a RMNF. The transition-zone is a frequency range over which the transmission response of the filter is changing from the passband with a specified insertion-loss to a stopband with a specified rejection level. To date, there are no widely tunable filtering solutions other than the RMNF above 12GHz. The current filter can be further improved by enhancing its frequency selectivity – this involves achieving wider bandwidths while simultaneously increasing the level of rejection.The second key contribution of this research is to demonstrate techniques to enhance the out-of-band rejection level of the RMNF. Our preliminary analysis shows that the level of rejection is constrained by the isolation of the 90-degree hybrid coupler. While there are current approaches to increasing the directivity of hybrid couplers, these approaches fail to address the wide-band requirement we have for our filtering application (10-50GHz). Thus, fundamental research is conducted and techniques to mitigate this coupler non-ideality are demonstrated.The third key contribution of this research is to demonstrate techniques to improve the spurious-free dynamic range (SFDR) of the RMNF. The noise contribution of the filter will fundamentally limit its usability in receiver applications since noise limits the sensitivity of a receiver. The introductions of nonlinearities in the filter will fundamentally limit its usability in transmitter applications since adjacent-channel leakage ratios constrain spurious emissions that can be present in wireless transmissions. The noise performance will set the floor of the SFDR and the linearity performance will set its ceiling. To make the RMNF more suitable for emerging communication applications, enhancements in both noise and linearity are demonstrated.The fourth key contribution of this research is to demonstrate how techniques utilized in the RMNF to increase its selectivity can be applied to N-path, or mixer-first, receivers, which also rely on N-path passive mixers. By cascading a RMNF and mixer-first receiver with enhanced selectivity, a widely-tunable, software-defined, frequency-selective receiver can be demonstrated above 6GHz. The cascaded system achieves sixth-order selectivity with greater than 800 MHz instantaneous RF bandwidth.Finally, this work demonstrates that for RMNF performance to be further improved, future research efforts need to focus on the following. Firstly, the leakage of the local oscillator (LO) signal from the mixer to the filter output needs to be reduced if the RMNF noise figure is to be minimized. Secondly, the power consumption of the RMNF (and RMNF and mixerfirst receiver cascade) need to be reduced for these circuits to be of practical use in emerging beamforming systems. Thirdly, techniques to calibrate the RMNF will need to be developed for robust filtering performance across a variety of process, voltage, and temperature diverse environments.
590 $a School code: 0155.
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