scholarly journals A Radio Frequency Magnetoelectric Antenna Prototyping Platform for Neural Activity Monitoring Devices with Sensing and Energy Harvesting Capabilities

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2123
Author(s):  
Diptashree Das ◽  
Mehdi Nasrollahpour ◽  
Ziyue Xu ◽  
Mohsen Zaeimbashi ◽  
Isabel Martos-Repath ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Integrated Circuits ◽  
Radio Frequency ◽  
Software Defined Radio ◽  
Low Frequency ◽  
Software Radio ◽  
Operating Conditions ◽  
Time Signal ◽  
Modulated Signals ◽  
Wireless Energy Harvesting

This article describes the development of a radio frequency (RF) platform for electromagnetically modulated signals that makes use of a software-defined radio (SDR) to receive information from a novel magnetoelectric (ME) antenna capable of sensing low-frequency magnetic fields with ultra-low magnitudes. The platform is employed as part of research and development to utilize miniaturized ME antennas and integrated circuits for neural recording with wireless implantable devices. To prototype the reception of electromagnetically modulated signals from a sensor, a versatile Universal Software Radio Peripheral (USRP) and the GNU Radio toolkit are utilized to enable real-time signal processing under varying operating conditions. Furthermore, it is demonstrated how a radio frequency signal transmitted from the SDR can be captured by the ME antenna for wireless energy harvesting.

Application of Digital Signal Processing in USRP Satellite Signal Detection

2017 ◽  
Vol 9 (2) ◽  
pp. 16-25 ◽  
Author(s):  
Giti Javidi ◽  
Ehsan Sheybani
Keyword(s):  
Signal Processing ◽  
Radio Frequency ◽  
Software Defined Radio ◽  
Rapid Development ◽  
Software Radio ◽  
Digital Signal ◽  
Gnu Radio ◽  
Flow Graph ◽  
Radio Frequency Signals ◽  
Logic Blocks

The Universal Software Radio Peripheral development technique is designing and implementing radio frequency based systems. The distinctiveness originates from the interchangeable daughterboard within the USRP. The system is designed around the Xilinx Vertex 3 FPGA chip. This means C++, Python, and VHDL can be used to program this device. The project consists of creating a receiver. The objective of the project is to research and comprehend the hardware functionalities of the USRP. The purpose is to create codes in C++ and Python to implement receiving capabilities of the device. The goal of this project was to design a GPS receiver that is capable of recording the L1 signal from a DirecTV satellite. The USRP is used a lot for research. This project consisted of more than just one method. We used GNU Radio Companion and Matlab/Simulink. GNU Radio is open source for building software defined radios. It is also known as GRC. While using GRC the USRP1 was the device used. This software has rapid development. It runs in Ubuntu, a Linux operating system. Within this software there are logic blocks. Each block consists of information to create a flow graph. The flow graph builds and generates the program. Simulink can be compared to GRC. They both have logic blocks that have to be connected to run. Simulink can be used to create a transmitter or a receiver for software radio development and signal processing. Software-defined radio can only be defined if its baseband operations can be completely defined by software. A SDR converts digital to analog signals. The USRP can also convert digital signals from a computer to Radio Frequency Signals (RF). This software is one way to communicate between hardware and software.

Mitigation of Non-Narrowband Radio Frequency Interference Incorporating Array Imperfections

2019 ◽  
Vol 08 (01) ◽  
pp. 1940013
Author(s):  
Jan-Willem W. Steeb ◽  
David B. Davidson ◽  
Stefan J. Wijnholds
Keyword(s):  
Radio Frequency ◽  
Software Defined Radio ◽  
Mutual Coupling ◽  
Low Frequency ◽  
Radio Frequency Interference ◽  
Digital Audio ◽  
Signal Model ◽  
Narrowband Signal ◽  
Calibration Step ◽  
High Band

In a recent paper, we presented a non-narrowband spatial radio frequency interference (RFI) mitigation algorithm for radio astronomy arrays. The algorithm constructs a 2nd-order filter by combining a 1st-order subspace subtraction method with a non-narrowband signal model. The model is based on the assumption that the frequency response is approximately flat and that the array is calibrated. In this paper, we consider the effects of array imperfections such as unknown complex gains and mutual coupling, incorporate these into the non-narrowband signal model and extend the RFI mitigation algorithm to include a calibration step. With a calibration step and no mutual coupling, the proposed algorithm was able to process twice the bandwidth per channel when compared to conventional narrowband techniques. This performance declines to 1.6 times greater bandwidth when the effect of mutual coupling is included. The evaluation of the algorithm was done using the layout of a Low Frequency Array (LOFAR) High Band Antenna (HBA) station and a digital audio broadcast recorded with a software defined radio.

Combine Micro-Probing and OBIRCH to Catch Non-Recognizable Fault in RF and Mixed-Mode Integrated Circuits

2007 ◽  
Author(s):  
Cha-Ming Shen ◽  
Yen-Long Chang ◽  
Lian-Fon Wen ◽  
Tan-Chen Chuang ◽  
Shi-Chen Lin ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Radio Frequency ◽  
Failure Analysis ◽  
Case Studies ◽  
Mixed Mode ◽  
Failure Mechanisms ◽  
Deep Submicron ◽  
Digital Logic ◽  
Successful Approach ◽  
Cmos Processes

Abstract Highly-integrated radio frequency and mixed-mode devices that are manufactured in deep-submicron or more advanced CMOS processes are becoming more complex to analyze. The increased complexity presents us with many eccentric failure mechanisms that are uniquely different from traditional failure mechanisms found during failure analysis on digital logic applications. This paper presents a novel methodology to overcome the difficulties and discusses two case studies which demonstrate the application of the methodology. Through the case studies, the methodology was proven to be a successful approach. It is also proved how this methodology would work for such non-recognizable failures.

Electrical Probing and Surface Imaging of Deep Sub-Micron Integrated Circuits

1999 ◽  
Author(s):  
Kenneth Krieg ◽  
Richard Qi ◽  
Douglas Thomson ◽  
Greg Bridges
Keyword(s):  
High Resolution ◽  
Integrated Circuits ◽  
Real Time ◽  
High Speed ◽  
Time Signal ◽  
Surface Imaging ◽  
Atomic Force ◽  
Submicron Structures ◽  
High Resolution Images ◽  
Capacitive Loading

Abstract A contact probing system for surface imaging and real-time signal measurement of deep sub-micron integrated circuits is discussed. The probe fits on a standard probe-station and utilizes a conductive atomic force microscope tip to rapidly measure the surface topography and acquire real-time highfrequency signals from features as small as 0.18 micron. The micromachined probe structure minimizes parasitic coupling and the probe achieves a bandwidth greater than 3 GHz, with a capacitive loading of less than 120 fF. High-resolution images of submicron structures and waveforms acquired from high-speed devices are presented.

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