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The problem of reducing electromagnetic interferences (EMI) in industrial and commercial systems is today an issue of international interest. Since nowadays the field of electrical and electronics engineering has rapidly advanced, various apparatus, such as radio and television broadcast stations communication transmitters and mobile phone, intentionally radiate electromagnetic energy during their...
This paper presents a measurement-based analysis of operation of an example MOSFET detector integrated with a narrow-band patch antenna. First, responsivity of the detector was measured versus frequency of incident wave revealing two responsivity peaks, and then the antenna and the transistor were on-wafer probed to extract their impedances and antenna resonances in order to better explain the behavior...
Warning devices, which simply notify the occurrence of High Power Microwave (HPM) pulses, are not sufficient for High Power Electromagnetic (HPEM) threat analysis. Instead, the determination of characteristic parameters like field strength, pulse width, repetition frequency, and direction of arrival allows the analysis and tracking of HPEM threat signals (forensics). A particular role is played by...
A compact, easily tunable terahertz burst emission system based on the mixing of two linearly chirped pulses in Michelson interferometer was investigated. The use of linearly chirped optical pulses ejected straight from the picosecond fiber laser enabled us to avoid bulky external optical pulse stretching schemes. System operation range determined from the power measurements reached up to 2.4 THz.
Properties of antenna-coupled microbolometers optimized for room temperature 300 GHz and 600 GHz resonant frequency detection is reported. Dipole antenna placed on freestanding SiN membrane is used to couple THz radiation power to the titanium-based thermo-resistor. We demonstrate that antenna-coupled micro-bolometers can be well suited for beam profile imaging of the THz pulses emitted by the photoconductive...
Cognitive radio is a potential technique for future wireless communications to mitigate the spectrum scarcity issue. One of the most important challenge of a cognitive radio system is to identify the presence of primary (licensed) users over a wide range of frequency spectrum at a particular time and specific geographic location. In this paper, a spectrum sensing technique for cognitive radios based...
Optimizing high-power ultrashort pulse amplifier using double-clad Yb-doped fiber, maximum output power of >3 W with a pulse width of 110 fs without pedestal component is obtained. Using this pulse, high-power THz pulse generation is measured by a pyroelectric detector with a low sensitivity.
This paper presents an on chip E shaped patch antenna connected to a plasmonic FET, acting as a THz detector in 130 nm CMOS technology. The measured frequency response of the fabricated antenna-coupled detector shows a bandwidth of 17 GHz with a peak responsivity of 773 V/W at 307 GHz. Time domain measurements using a femtosecond laser confirms wideband operation of the plasmonic detector.
This paper described one differential measurement method by using a lock-in amplifier as null detector, which can directly compare one high-purity sinusoidal [HPS] produced by a commercial precision calibrator with one stepwise-approximated sine wave [SASW] generated by programmable Josephson voltage standard [PJVS] in fundamental root-mean-square [FRMS] values at NIM. The preliminary results show...
The analysis of videos taken by active operators recording human interactions and activities in the field presents a new set of challenges. For brevity in this paper we will call such subject centric field grade videos ad hoc videos of events. Human test subjects readily segment ad hoc videos of events into scene-like segments. These segmentations can not be replicated by the state of the art automatic...
Based on ARM processor and WinCE embedded systems, a detector design is provided for some certain special equipment temperature controller, as well as the relevant hardware and software. In software design, the operating system is customized, driver for hardware is programmed and testing data real-time display is achieved through multi-threading technology with extra data saving and failure analysis...
We report the first experimental results of single graphene-on-glass FET-based envelope detectors operating at digital communication data rate of 20 Mb/s with RF carrier frequency above 5 GHz. The new ambipolar GFET envelope detectors operated with zero power consumption, which is potentially ideal for ultra-low-power wireless networks. GFET ambipolar envelope detectors offer excellent 40 dB linear...
This paper presents a high performance THz imaging array using advanced CMOS technology. The single element of the 0.3 THz 4×4 45 nm CMOS imaging array is composed of a high-efficiency differential on-chip antenna meeting all metal-density rules, which is coupled to a differential detector and a low noise CMOS IF amplifier. The array results in an NEP of 100 pW/Hz1/2, a responsivity of 1.8–2.0 kV/W...
A THz Fabry-Perot spectrum analyzer is presented that uses substrate-based, wire-grid polarizers as the reflectors. Previous THz scanning Fabry-Perot concepts have used wiremeshes or thin metallic layers as the reflectors, both of which are effective to some degree, but lack tunability. The use of wire-grid polarizers allows for fully tunable resolution and throughput, thus enhancing the Fabry-Perot...
This article describes a device for a phase noise measurement using the phase locked loop (PLL). This allows measuring signals with the possibility of passing the phase noise better than −160 dB. There are analyzed the effects of the measuring device on the measuring results and presented examples of solving the PLL, circuits for low-frequency signal processing and power supplies with their minimal...
A lidar system with high tolerance to background light is described. Velocity sensitivity measurements using two different signal processing methods are compared. Sensitivity of −90 dBm is realized for up to 6.9 km/s emulated speeds.
In this paper, a CEA (carcinoembryonic antigen) concentration measurement system using flexural plate wave (FPW) biosensors and a frequency-shift readout IC is presented. The proposed frequency-shift readout method employs a programmable frequency generator and a peak detecting scheme to estimate the resonant frequency. The programmable frequency generator provides a frequency scanning range from...
A low power 6-bit flash ADC that uses an input voltage range detection algorithm is described. In this work, four digital input voltage range detectors are employed and each input voltage range detector generates the specific clock signal only if the input voltage falls between two adjacent reference voltages applied to the detector. The specific clock signal generated by the detector is applied to...
Broadband microwave receivers with electronic warfare applications often exhibit frequency variations that degrade performance. Most notably, a negative gain slope is inherent to an RF/Microwave receiver chain, in-part, because of attenuation that results from frequency-dependent ohmic losses in the dielectric. We present a novel approach to tunable gain slope equalization that solves this problem...
In view of the LHC upgrade phases towards the High Luminosity LHC (HL-LHC), the ATLAS experiment plans to upgrade the Inner Detector with an all-silicon system. Because of its radiation hardness and cost effectiveness, the n-on-p silicon technology is a promising candidate for a large area pixel detector. The paper reports on the joint development, by LPNHE and FBK of novel n-on-p edgeless planar...
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