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N. Scott Barker
University of Virginia
Terahertz radiationEngineeringElectronic engineeringMicroelectromechanical systemsOptoelectronics
88Publications
11H-index
517Citations
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Publications 88
Newest
#1Jesse Moody (UVA: University of Virginia)H-Index: 4
#2Songbin Gong (UIUC: University of Illinois at Urbana–Champaign)H-Index: 14
Last. N. Scott Barker (UVA: University of Virginia)H-Index: 11
view all 12 authors...
This work presents a reconfigurable wake-up receiver, which obtains -106dBm sensitivity with power consumption as low as 33nW. Bit-level duty cycling provides 68dB RF gain at sub-μW average power consumption, improving sensitivity over other sub-μW receivers. The receiver rejects interference using a compact RF MEMS filter and a fully automatic gain and offset control loop. Digital tuning of DC power, latency, and sensitivity provides high levels of flexibility to enable a wide variety of applic...
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#1Di Lu (CUHK: The Chinese University of Hong Kong)H-Index: 2
#1Di LuH-Index: 4
Last. Xiaohong TangH-Index: 12
view all 6 authors...
This article proposes an advanced synthesis of the frequency-adaptive bandpass filter (FA-BPF) with constant absolute bandwidth (ABW). The proposed synthesis is based on the element-variable coupling matrix (EVCM), which is directly extracted from the classical filter polynomials. The extraction method is presented, investigated in detail, and confirmed by a set of numerical simulations. All frequency-dependent couplings between the resonators in an FA-BPF are uniquely modeled by the new couplin...
3 CitationsSource
#1Robert M. Weikle (UVA: University of Virginia)H-Index: 23
#2Souheil NadriH-Index: 3
Last. Mona ZebarjadiH-Index: 21
view all 9 authors...
Thermal management and design have been understood, for many years, as critical factors in the implementation of submillimeter-wave Schottky-diode-based circuits and instruments. Removal of heat is...
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#1Jesse Moody (UVA: University of Virginia)H-Index: 4
#2Anjana Dissanayake (UVA: University of Virginia)
Last. Steven M. Bowers (UVA: University of Virginia)H-Index: 7
view all 12 authors...
This work presents a 33 nW wake-up receiver with -106 dBm sensitivity at 428 MHz. Within-bit duty cycling allows RF gain at nano-watt DC power levels providing 26 dB sensitivity improvement over prior art at iso-power. An RF MEMS filter and an automatic gain and offset control loop suppress noise and reject interference. The receiver can be digitally tuned across DC power, latency, and sensitivity to provide flexible functionality from indoor short range to outdoor long-range applications.
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Jun 1, 2019 in IMS (International Microwave Symposium)
#1Chunhu Zhang (UVA: University of Virginia)H-Index: 7
#2Matthew F. BauwensH-Index: 7
Last. Robert M. Weikle (UVA: University of Virginia)H-Index: 23
view all 7 authors...
This paper demonstrates the first differential on-wafer probe with integrated balun operating in the WR-3.4 (220 – 330 GHz) waveguide band. The probe employs integrated balun circuitry to convert the single-ended signal from the waveguide output of a VNA into differential stimuli at the on-wafer transmission line output. The design approach, fabrication method, and measured results are described in this paper.
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#1Linli Xie (UVA: University of Virginia)H-Index: 4
#2Matthew F. BauwensH-Index: 7
Last. Robert M. Weikle (UVA: University of Virginia)H-Index: 23
view all 8 authors...
An approach for one port on-wafer electronic calibration at submillimeter wavelengths is described. Quasivertical GaAs Schottky diodes integrated onto silicon serve as the electronic calibration standard. The S-parameters of the diode standards are characterized over the WM-570 (325—500 GHz) band as a function of bias and subsequently used as the standard for one-port calibration. Comparisons of the error coefficients derived using the diode standard are shown to be in good agreement with those ...
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#1Jesse Moody (UVA: University of Virginia)H-Index: 4
#2Pouyan Bassirian (UVA: University of Virginia)H-Index: 4
Last. Steven M. Bowers (UVA: University of Virginia)H-Index: 7
view all 7 authors...
This paper presents the development of a wake-up receiver (WuRX) at nanowatt power levels for event-driven applications. This paper improves the state of the art, obtaining higher sensitivity than previous work in the 151.8- and 433-bands, low-power operation, and robustness to interference due to an integrated offset compensation algorithm operating without any external calibration. Simultaneous low-power operation and high sensitivity are achieved through a passive detector design based upon a...
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#1Di Lu (CUHK: The Chinese University of Hong Kong)H-Index: 1
#2Ming Yu (CUHK: The Chinese University of Hong Kong)H-Index: 3
Last. Shi-Wen Tang (University of Electronic Science and Technology of China)H-Index: 1
view all 5 authors...
This paper proposes a general method to design the power divider (PD) with the arbitrary filtering response. The proposed model allows coupling matrix-based filter synthesis to be adopted in the Wilkinson PD (W-PD) design so that two-order, high-order, single-band, multiband, frequency-fixed, and frequency-tunable responses are all available for the W-PD. Meanwhile, benefiting from the generalized W-PD topology, the general model can be employed to design the PD with arbitrary termination impeda...
1 CitationsSource
#1Pouyan Bassirian (UVA: University of Virginia)H-Index: 4
#2Jesse Moody (UVA: University of Virginia)H-Index: 4
Last. Steven M. Bowers (UVA: University of Virginia)H-Index: 7
view all 10 authors...
This paper presents the first demonstration of nanowatt-level CMOS wakeup receiver (WuRx) front ends (FEs) that utilize microelectromechanical system (MEMS)-based matching networks (MNs). The first FE uses a fully MEMS-based MN (MMN) that operates at 88.8 MHz. It consists of a large array of lithium niobate resonators that are fabricated on the same die. Measurements of the integrated WuRx FE with the MMN indicate that its loaded voltage gain achieves a bandwidth of 0.78 MHz with a quality facto...
1 CitationsSource
#1N. Scott Barker (UVA: University of Virginia)H-Index: 11
#2Thomas Zwick (KIT: Karlsruhe Institute of Technology)H-Index: 33
I have had the privilege of serving as the Editor-in-Chief (EiC) for IEEE Microwave and Wireless Components Letters (MWCL) for the past three years. During this time, the Letters has experienced a 20% increase in the number of papers submitted and published. In addition, with the excellent work of associate editors (AEs) and reviewers, the impact factor has come back up to 2.17 for 2017. In order to handle this increased load, we have modified the Editorial Board by adding track editors between ...
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