SECOND BIRTH OF TROPOSPHERIC COMMUNICATION. PHASED ANTENNA ARRAY COGNITIVE RADIO STATIONS

2020 ◽  
Author(s):  
Л.О. МЫРОВА ◽  
А.В. ШЕВЫРЕВ ◽  
С.А. МУСАЕЛЯН ◽  
И.С. ПОПОВ ◽  
В.А. ВОРОЩАК
Keyword(s):  
Cognitive Radio ◽  
Power Consumption ◽  
Low Power ◽  
Antenna Array ◽  
Radio Stations ◽  
Term Operation ◽  
Hardware Reliability ◽  
Phased Antenna Array ◽  
Technical Solutions

Рассмотрены новые прорывные технические решения по тропосферной связи на основе когнитивных радиостанций с фазированной антенной решеткой (ФАР). Показана возможность повышения (в десятки раз)аппаратурной надежности за счет исключения из состава ТРС мощных передатчиков и применения вместо них маломощных антенных приемопередающих модулей (АППМ),синфазноработающих в составе ФАР. Представлены преимуществами ТРС: возможность длительной работа без технического обслуживания, снижение вдвое энергопотребления, а также глубокая унификация построения ТРС разного класса на основе унифицированных АППМ. New breakthrough technical solutions for tropospheric communication based on cognitive radio stations with a phased antenna array (PAA) are considered. These solutions provide the possibility of increasing the hardware reliability tenfold due to exclusion of powerful transmitters from tropospheric stations (TS) and using instead of them low-power antenna receive-transmitting modules (ARTM), operating in phase as part of the PAA. The advantages of such TSs are shown that enable long-term operation without maintenance, halving power consumption, as well as deep unification of the construction of TSs of different classes based on unified ARTMs.

26.3 Design of a Low Power Consumption a-IGZO TFT-based Vcom Driver Circuit with Long-Term Reliability

2011 ◽  
Vol 42 (1) ◽  
pp. 338-341 ◽  
Author(s):  
Hoon Jeong ◽  
Mallory Mativenga ◽  
Jin Jang ◽  
Sang Gul Lee ◽  
Yong Min Ha
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Low Power Consumption ◽  
Driver Circuit ◽  
Igzo Tft

scholarly journals 50 MHz–10 GHz Low-Power Resistive Feedback Current-Reuse Mixer with Inductive Peaking for Cognitive Radio Receiver

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Nandini Vitee ◽  
Harikrishnan Ramiah ◽  
Wei-Keat Chong ◽  
Gim-Heng Tan ◽  
Jeevan Kanesan ◽  
...  
Keyword(s):  
Cognitive Radio ◽  
Power Consumption ◽  
Low Power ◽  
Noise Figure ◽  
Cmos Technology ◽  
Radio Receiver ◽  
Conversion Gain ◽  
Current Reuse ◽  
Inductive Peaking ◽  
Resistive Feedback

A low-power wideband mixer is designed and implemented in 0.13 µm standard CMOS technology based on resistive feedback current-reuse (RFCR) configuration for the application of cognitive radio receiver. The proposed RFCR architecture incorporates an inductive peaking technique to compensate for gain roll-off at high frequency while enhancing the bandwidth. A complementary current-reuse technique is used between transconductance and IF stages to boost the conversion gain without additional power consumption by reusing the DC bias current of the LO stage. This downconversion double-balanced mixer exhibits a high and flat conversion gain (CG) of 14.9 ± 1.4 dB and a noise figure (NF) better than 12.8 dB. The maximum input 1-dB compression point (P1dB) and maximum input third-order intercept point (IIP3) are −13.6 dBm and −4.5 dBm, respectively, over the desired frequency ranging from 50 MHz to 10 GHz. The proposed circuit operates down to a supply headroom of 1 V with a low-power consumption of 3.5 mW.

Glass low power closed-cycle cryo-refrigerator for long term operation

Cryogenics ◽  
1990 ◽  
Vol 30 (12) ◽  
pp. 1074-1078 ◽  
Author(s):  
W. Engelland ◽  
V. Kose
Keyword(s):  
Low Power ◽  
Closed Cycle ◽  
Term Operation

scholarly journals Metal–Oxide Nanowire Molecular Sensors and Their Promises

Chemosensors ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 41
Author(s):  
Hao Zeng ◽  
Guozhu Zhang ◽  
Kazuki Nagashima ◽  
Tsunaki Takahashi ◽  
Takuro Hosomi ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Power Consumption ◽  
Low Power ◽  
High Surface ◽  
Low Power Consumption ◽  
Ultra Low Power ◽  
Molecular Sensors ◽  
Term Stability ◽  
Long Term Stability

During the past two decades, one–dimensional (1D) metal–oxide nanowire (NW)-based molecular sensors have been witnessed as promising candidates to electrically detect volatile organic compounds (VOCs) due to their high surface to volume ratio, single crystallinity, and well-defined crystal orientations. Furthermore, these unique physical/chemical features allow the integrated sensor electronics to work with a long-term stability, ultra-low power consumption, and miniature device size, which promote the fast development of “trillion sensor electronics” for Internet of things (IoT) applications. This review gives a comprehensive overview of the recent studies and achievements in 1D metal–oxide nanowire synthesis, sensor device fabrication, sensing material functionalization, and sensing mechanisms. In addition, some critical issues that impede the practical application of the 1D metal–oxide nanowire-based sensor electronics, including selectivity, long-term stability, and low power consumption, will be highlighted. Finally, we give a prospective account of the remaining issues toward the laboratory-to-market transformation of the 1D nanostructure-based sensor electronics.

scholarly journals Emulating Artificial Synaptic Plasticity Characteristics from SiO2-Based Conductive Bridge Memories with Pt Nanoparticles

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 306
Author(s):  
Panagiotis Bousoulas ◽  
Charalampos Papakonstantinopoulos ◽  
Stavros Kitsios ◽  
Konstantinos Moustakas ◽  
Georgios Ch. Sirakoulis ◽  
...  
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Bottom Electrode ◽  
Pt Nanoparticles ◽  
Low Power Consumption ◽  
Dense Layer ◽  
Bipolar Switching ◽  
Conductive Bridge ◽  
High Degree

The quick growth of information technology has necessitated the need for developing novel electronic devices capable of performing novel neuromorphic computations with low power consumption and a high degree of accuracy. In order to achieve this goal, it is of vital importance to devise artificial neural networks with inherent capabilities of emulating various synaptic properties that play a key role in the learning procedures. Along these lines, we report here the direct impact of a dense layer of Pt nanoparticles that plays the role of the bottom electrode, on the manifestation of the bipolar switching effect within SiO2-based conductive bridge memories. Valuable insights regarding the influence of the thermal conductivity value of the bottom electrode on the conducting filament growth mechanism are provided through the application of a numerical model. The implementation of an intermediate switching transition slope during the SET transition permits the emulation of various artificial synaptic functionalities, such as short-term plasticity, including paired-pulsed facilitation and paired-pulse depression, long-term plasticity and four different types of spike-dependent plasticity. Our approach provides valuable insights toward the development of multifunctional synaptic elements that operate with low power consumption and exhibit biological-like behavior.

scholarly journals A Low-Power WSN Protocol with ADR and TP Hybrid Control

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5767 ◽  
Author(s):  
Chung-Wen Hung ◽  
Hao-Jun Zhang ◽  
Wen-Ting Hsu ◽  
Yi-Da Zhuang
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Multiple Access ◽  
Control Algorithm ◽  
Hybrid Control ◽  
Control Group ◽  
Battery Life ◽  
Transmission Power ◽  
Time Division

Most Internet of Things (IoT) systems are based on the wireless sensor network (WSN) due to the reduction of the cable layout cost. However, the battery life of nodes is a key issue when the node is powered by a battery. A Low-Power WSN Protocol with ADR and TP Hybrid Control is proposed in this paper to improve battery life significantly. Besides, techniques including the Sub-1GHz star topology network with Time Division Multiple Access (TDMA), adaptive data rate (ADR), and transmission power control (TPC) are also used. The long-term testing results show that the nodes with the proposed algorithm can balance the communication quality and low power consumption simultaneously. The experimental results also show that the power consumption of the node with the algorithm was reduced by 38.46-54.44% compared with the control group. If using AAA battery with 1200 mAh, the node could run approximately 4.2 years with the proposed hybrid control algorithm with an acquisition period of under 5 s.

A CMOS Low-Power Digital Variable Gain Amplifier Design for a Cognitive Radio Receiver “Application for IEEE 802.22 Standard”

2018 ◽  
Vol 27 (09) ◽  
pp. 1850135 ◽  
Author(s):  
Sawssen Lahiani ◽  
Samir Ben Salem ◽  
Houda Daoud ◽  
Mourad Loulou
Keyword(s):  
Cognitive Radio ◽  
Power Consumption ◽  
Low Power ◽  
High Gain ◽  
Low Noise ◽  
Constant Current ◽  
Variable Gain Amplifier ◽  
Low Power Consumption ◽  
Radio Receiver ◽  
Variable Gain

This paper presents the design of a new Digital Variable Gain Amplifier cell (DVGA). The proposed circuit based on transconductance, gm, amplifier and a transconductance amplifier is analyzed and designed for a cognitive radio receiver. The variable-gain amplifier (VGA) proposed consists of a digital control block, an auxiliary pair to retain a constant current density, and offers a gain-independent bandwidth (BW). A novel cell structure is designed for high gain, high BW, low power consumption and low Noise Figure (NF). The Heuristic Method is used to optimize the proposed circuit performance for high gain, low noise and low power consumption. This circuit is implemented and simulated using device-level description of TSMC 0.18[Formula: see text][Formula: see text]m CMOS process. Simulation results show that the DVGA can provide a gain variation range of 54[Formula: see text]dB (from 54[Formula: see text]dB to 0[Formula: see text]dB) with a 3[Formula: see text]dB BW over more than 110[Formula: see text]MHz. The circuit consumes the maximum power of 0.65[Formula: see text]mW from a 1.8[Formula: see text]V supply.

Design of a low-power-consumption a-IGZO TFT-based Vcom driver circuit with long-term reliability

2011 ◽  
Vol 19 (11) ◽  
pp. 825 ◽  
Author(s):  
Hoon Jeong ◽  
Mallory Mativenga ◽  
Sang Gul Lee ◽  
Yong Min Ha ◽  
Jin Jang
Keyword(s):  
Power Consumption ◽  
Low Power ◽  
Low Power Consumption ◽  
Driver Circuit ◽  
Igzo Tft
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