Results 21 to 30 of about 1,358 (264)

Proposing a Modified Switchable Schiffman Structure to Implement a Wideband and Low-Loss 4-bit Digital Phase Shifter

IEEE Access
This paper proposes a modified Schiffman structure to implement a wideband, low-loss 4-bit digital phase shifter. Here, low-cost positive intrinsic negative (PIN) diodes are used for electronically controlling the phase states of the phase shifter.
Mostafa Khazaei, Seyyed Hossein Mohseni Armaki, Amir Saman Noor Amin   +2 more
doaj   +1 more source

The Design of a 140 GHz 28 nm CMOS Vector-Sum Phase Shifter Based on Gilbert Cell and Current-Steering Amplifiers

Chips
This paper presents the design of a 140 GHz vector-sum phase shifter in a 28 nm CMOS process. Two variable-gain amplifiers—Gilbert cell and current-steering amplifiers—are investigated and compared.
Junyung Cho, Jung-Hyun Lee, M. Kim
doaj   +1 more source

Performance Evaluation of Analog Beamforming with Hardware Impairments for mmW Massive MIMO Communication in an Urban Scenario

Sensors, 2016
The use of massive multiple-input multiple-output (MIMO) techniques for communication at millimeter-Wave (mmW) frequency bands has become a key enabler to meet the data rate demands of the upcoming fifth generation (5G) cellular systems.
Sonia Gimenez, Sandra Roger, Paolo Baracca, David Martín-Sacristán, Jose F. Monserrat, Volker Braun, Hardy Halbauer   +6 more
doaj   +1 more source

Large Scale Optical Assisted Mm-Wave Beam-Hopping System for Multi-Hop Bent-Pipe LEO Satellite Networks

Applied Sciences, 2023
By introducing the arrayed waveguide router (AWGR) optical true time-delay (OTTD) architecture in bent-pipe satellite optical inter-link to optically assist the RF phased array in Low-earth orbit satellites will extend the multi-hop bent-pipe satellite ...
Shiyi Xia, Peilong Liu, Mingyang Zhao, Cheng Zou, Fengwei Shao, Jifeng Jin, Haiwang Wang, Guotong Li   +7 more
doaj   +1 more source

A 7-Bit Vector-Sum Phase Shifter for LEO Satellite Communication in 90-Nm CMOS Process

IEEE Access
This paper presents a 7-bit vector-sum phase shifter for low-earth-orbit satellite communication. The phase shifter consists of a differential-type quadrature all-pass filter (QAF) and an analog differential vector adder, where a matching network is ...
Hao-Jen Tu, Hsiao-Chin Chen, Pin-Hsuan Chen, Po-Yen Huang   +3 more
doaj   +1 more source

A Self-Body-Biasing Network of Vector Sum Phase Shifter for Reduction of Output Capacitance Variation and Supply Current Variation

IEEE Access
This paper presents the self-body-biasing effects of a vector-sum phase shifter(VSPS) in 0.13- $\mu $ m CMOS technology. The self-body-biasing network is simply implemented by connecting the drain and body terminals of a vector-sum MOSFET amplifier ...
Junhan Lim, Gwanghyeon Jeong, Songcheol Hong   +2 more
doaj   +1 more source

Digital-phase-shifter performance

Electronics Letters, 1973
The performance of a new type of digital phase shifter is compared with that of analogue systems of comparable complexity. The digital method results in greater stability and precision and is particularly applicable to digitally controlled systems that require a large number of phase-shifted signals.
openaire   +3 more sources

Design and implementation of a compact and ultra-wideband 5~18 GHz multifunction chip

Dianzi Jishu Yingyong
A compact and ultra-wideband 5~18 GHz multifunction chip in Gallium Arsenide (GaAs) technology is presented. The multifunction chip integrates 3 Single Pole Double Throw (SPDT) switches, 3 medium amplifiers, 6 bit digital attenuator and 6 bit digital ...
Dou Xingkun, Zhang Lei, Li Guangchao, Ma Ruoyu, Jiang Le   +4 more
doaj   +1 more source

A Lossy Capacitance Measurement Circuit Based on Analog Lock-in Detection

Elektronika ir Elektrotechnika, 2020
This paper presents a lossy capacitance measuring circuit which is based on analog lock-in detection technique. Lossy capacitance can be modelled as a pure capacitor connected in parallel with a resistor.
Mehmet Demirtas, Mehmet Akif Erismis, Salih Gunes   +2 more
doaj   +1 more source

Organ‐specific redox imbalances in spinal muscular atrophy mice are partially rescued by SMN antisense oligonucleotides

FEBS Letters, EarlyView.
We identified a systemic, progressive loss of protein S‐glutathionylation—detected by nonreducing western blotting—alongside dysregulation of glutathione‐cycle enzymes in both neuronal and peripheral tissues of Taiwanese SMA mice. These alterations were partially rescued by SMN antisense oligonucleotide therapy, revealing persistent redox imbalance as ...
Sofia Vrettou, Brunhilde Wirth
wiley   +1 more source