A Low-Noise Low-Cost EEG Amplifier for Neural Recording Applications

2018 ◽  
pp. 581-589
Author(s):  
Pavan Varma Tirumani ◽  
Soukhin Das ◽  
Piyush Swami ◽  
Tapan Gandhi
Keyword(s):  
Low Cost ◽  
Neural Recording ◽  
Low Noise

Transmission Electron Microscopy of oriented Co84Cr14Ta2 thin films for longitudinal magnetic recording

1991 ◽  
Vol 49 ◽  
pp. 756-757
Author(s):  
T. P. Nolan
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Low Cost ◽  
Low Noise ◽  
Information Storage ◽  
High Coercivity ◽  
Magnetic Alloy ◽  
Magnetic Media ◽  
Transmission Electron

Thin film magnetic media are being used as low cost, high density forms of information storage. The development of this technology requires the study, at the sub-micron level, of morphological, crystallographic, and magnetic properties, throughout the depth of the deposited films. As the microstructure becomes increasingly fine, widi grain sizes approaching 100Å, the unique characterization capabilities of transmission electron microscopy (TEM) have become indispensable to the analysis of such thin film magnetic media.Films were deposited at 225°C, on two NiP plated Al substrates, one polished, and one circumferentially textured with a mean roughness of 55Å. Three layers, a 750Å chromium underlayer, a 600Å layer of magnetic alloy of composition Co84Cr14Ta2, and a 300Å amorphous carbon overcoat were then sputter deposited using a dc magnetron system at a power of 1kW, in a chamber evacuated below 10-6 torr and filled to 12μm Ar pressure. The textured medium is presently used in industry owing to its high coercivity, Hc, and relatively low noise. One important feature is that the coercivity in the circumferential read/write direction is significandy higher than that in the radial direction.

A 0.5 to 4.0GHz Low-Cost Broadband GaAs HBT Low Noise Amplifier

2019 ◽  
Author(s):  
Qian lin ◽  
Haifeng Wu ◽  
Yi-Jun Chen ◽  
Liu-Lin Hu ◽  
Xiao-Ming Zhang ◽  
...  
Keyword(s):  
Low Cost ◽  
Low Noise ◽  
Low Noise Amplifier ◽  
Noise Amplifier

scholarly journals Experimental Implementation of a Low-Cost, Fully-Analog Self-Jamming Canceller for UHF RFID Devices

Electronics ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 786 ◽  
Author(s):  
Massimiliano Rossi ◽  
Riccardo Liberati ◽  
Marco Frasca ◽  
John Richardson
Keyword(s):  
Low Cost ◽  
Low Noise ◽  
Modular System ◽  
Uhf Rfid ◽  
Rf Receiver ◽  
Experimental Implementation ◽  
And Performance ◽  
Modular Technology ◽  
Noise Amplification ◽  
Theoretical Simulations

It is quite common for transceivers to operate with the RF receiver and transmitter working on different time slots. Typical applications are radars and transceivers in the field of communications. Generally, the receiver is turned off when the transmitter broadcasts and vice versa. This is done in order to prevent the transmitter from blinding the receiver or causing the RF low noise amplification (LNA) stage to saturate. When keeping a receiver active, some leakage of RF energy is inevitable, and therefore shielding is applied to mitigate spurious signals. However, there are many applications wherein the receiver cannot be turned off. To address these applications, we investigate the design and performance of a fully-analog self-jamming canceller able to operate in UHF (Ultra High Frequency) RFID devices. While the traditional cost to design and build this type of topology can be quite high, our proposal is based on a low-cost physical approach. In addition to using common SMT (Surface Mount Technology) devices, we leveraged a new piece of modular technology offered by X-Microwave which allows designers to easily produce RF solutions with a broad portfolio of modular system drop-in blocks. A prototype was realized and the measured results are in close agreement with theoretical simulations. Significant damping of the leaked signal in the receiving channel was realized.

scholarly journals Feasibility of Consumer Grade GNSS Receivers for the Integration in Multi-Sensor-Systems

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2463 ◽  
Author(s):  
Tobias Kersten ◽  
Jens-André Paffenholz
Keyword(s):  
System Integration ◽  
Carrier Phase ◽  
Low Cost ◽  
Power Saving ◽  
Low Noise ◽  
Small Scale ◽  
Sensor Systems ◽  
Phase Code ◽  
Gnss Receivers ◽  
Zero Baseline

Various GNSS applications require low-cost, small-scale, lightweight and power-saving GNSS devices and require high precision in terms of low noise for carrier phase and code observations. Applications vary from navigation approaches to positioning in geo-monitoring units up to integration in multi-sensor-systems. For highest precision, only GNSS receivers are suitable that provide access to raw data such as carrier phase, code ranges, Doppler and signal strength. A system integration is only possible if the overall noise level is known and quantified at the level of the original observations. A benchmark analysis based on a zero baseline is proposed to quantify the stochastic properties. The performance of the consumer grade GNSS receiver is determined and evaluated against geodetic GNSS receivers to better understand the utilization of consumer grade receivers. Results indicate high similarity to the geodetic receiver, even though technical limitations are present. Various stochastic techniques report normally distributed carrier-phase noise of 2 mm and code-range noise of 0.5–0.8 m. This is confirmed by studying the modified Allan standard deviation and code-minus-carrier combinations. Derived parameters serve as important indicators for the integration of GNSS receivers into multi-sensor-systems.

Some Considerations in the Design of Low Cost Remotely-Piloted Aircraft for Civil Remote Sensing Applications

1983 ◽  
Vol 37 (3) ◽  
pp. 157-167 ◽  
Author(s):  
G. F. Tomlins
Keyword(s):  
Aerial Photography ◽  
Low Cost ◽  
Video Camera ◽  
Low Noise ◽  
Wildlife Habitat ◽  
Camera System ◽  
Black And White ◽  
Sensing Applications ◽  
Site Mapping ◽  
Remotely Piloted Aircraft

Early in 1982, B.C. Research began to evaluate the feasibility, advantages and limitations of using Remotely-Piloted Aircraft (RPA) to acquire aerial photography in environmental applications. Advantages associated with these aircraft include low costs, ease of operation, low noise levels, portability, safety and very low speed-low altitude capability. In the first phase of this program, a three-meter span fixed-wing aircraft was constructed from a commercial model kit and modified to carry a remotely-operated 35 mm camera system. In summer 1982, this system was used to acquire aerial photography in a variety of applications including forestry, pollution detection, wildlife habitat assessment, site mapping, publicity, wildlife inventories and shoreline mapping. Various operational limitations were encountered including difficulty of navigation and aircraft control, the fragility of the “model” airframe and its limited payload capability. These limitations are being addressed in Phase II of the program, during which a purpose-built airframe is under development, equipped with automatic flight controllers and emergency systems, and employing digitally-encoded radio signals for secure aircraft command. A black-and-white video camera installed in the airframe provides real-time imagery as an aid to navigation and photoframing.

scholarly journals Precession Azimuth Sensing with Low-Noise Molecular Electronics Angular Sensors

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Dmitry L. Zaitsev ◽  
Vadim M. Agafonov ◽  
Egor V. Egorov ◽  
Alexander N. Antonov ◽  
Vladimir G. Krishtop
Keyword(s):  
Molecular Electronics ◽  
Low Cost ◽  
Rotational Velocity ◽  
High Sensitivity ◽  
Low Noise ◽  
Motion Sensors ◽  
Noise Performance ◽  
Rotating Platform ◽  
Vector Projection ◽  
Signal Processing Algorithms

This paper describes the use of MET-based low-noise angular motion sensors to precisely determine azimuth direction in a dynamic-scheme method of measuring the Earth’s rotational velocity vector. The scheme includes sensor installation on a rotating platform so that it could scan the space and seek for the position of the highest Earth’s rotation vector projection on its axis. This method is very efficient provided a low-noise sensor is used. A low-cost angular sensor based on MET (molecular electronic transduction) technology has been used. The sensors of this kind were originally developed for seismic activity monitoring and are well known for very good noise performance and high sensitivity. This approach, combined with the use of special signal processing algorithms, allowed reaching the accuracy of 0.2°, while the measurement time was less than 100 seconds.

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