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The impact of DC current on excitation characteristic of transformer is analyzed under bipolar asymmetric operation of HVDC power transmission system. The operating performance of single-phase transformer with three-limb core located near DC grounding pole is measured, and the relationship of vibration, noise and oil temperature of the transformer with such parameters as unbalance degree of HVDC bipolar...
Schottky diodes are key elements of RF and terahertz electronics. The design of the lateral Schottky with the contact directly to the side of the electron 2D channel in GaN/AlGaN system provides an advantage of extremely small capacitance and series resistance. The lateral Schottky devices based on high quality GaN/AlGaN heterostructures were grown by molecular beam epitaxy. The current voltage characteristics...
The noise mechanisms in graphene and MoS2 are quite different. The noise characteristics of MoS2 transistors could be described by the McWhorter model. The range of the trap densities responsible for the 1/f noise in MoS2 extracted from the noise measurements is from ∼1018 eV−1cm−3 to ∼ 6×1020 eV−1cm−3. The smallest noise level and smallest trap density was found for multilayer MoS2 transistors with...
DC, RF and noise parameters of GaAs pHEMTs with 100 nm gate length and widths (μm) of 2×10, 2×15, 2×25, 2×50, 2×75, 4×50 were investigated with the focus on test structure with gate width of 2 × 50 µm. Using a Maury Microwaves ATS system in the 8–50 (K, Ka), 50–75 (V) and 75–110 GHz (W) frequency band, the noise parameters were measured and calculated employing the Y-Factor method. The sources of...
Resistivity and low frequency (10 Hz – 20 kHz) noise characteristics of composite materials with multi-walled carbon nanotubes (MWCNTs) have been carried out over wide voltage and temperature (73–380 K) ranges. Composite materials with epoxy-grafted (MWCNT's surface covered by liquid epoxy resin) and amino-grafted (MWCNT's surface covered by polyethylene polyamine) MWCNTs were investigated. Low-frequency...
Here we report on the efficient detection of THz radiation generated from Ti:sapphire femtosecond laser system. The large-area interdigitated antenna is excited by optical pulses with pulse duration from 15 to 47 fs. We have tested two AlGaN/GaN HEMT-based THz detectors with integrated broadband antennas. Detectors are comparable in sensitivity but differ in applied parasitic signals elimination techniques...
A novel comb-structure-based, capacitive MEMS microphone concept is proposed, which is expected to significantly reduce viscous damping losses, challenging the high performance of conventional MEMS microphones. To this end, we derived a dedicated, fully energy-coupled and properly calibrated system-level model scaling with all relevant design parameters. It enables to discriminate in detail the impact...
We report on ac-driven electroconvection (EC) in a nematic liquid crystal (NLC) under superposed multiplicative noise; the EC system consists of a thin layer (d = 10–100 µm) of an NLC in an applied electric field. Ac-driven traveling waves (TWs) have been one of attractive EC showing a Hopf bifurcation, which have been well explained by a weak-electrolyte model. In this paper, noise-induced traveling...
This paper reports a high performance capacitive accelerometer with a noise level of 350ng/√Hz, bandwidth of 4.5kHz, and 135 dB open loop dynamic range at 1Hz bandwidth. The accelerometer was designed in a mode-tuning structural platform. This platform is developed to address the issue between sensitivity and bandwidth for the low-noise capacitive in-plane accelerometers. The platform proposes to...
The characterization of supra-threshold stochastic resonance (SSR) in which we add noise in an array of N elements, has been discussed. Previous work on SSR was carried out for the calculation of cross correlation co-efficient for uniform signal with uniform distributed noise and Gaussian signal with Gaussian distributed noise. But there is always uncertainty about the distribution of real data. So,...
This paper presents an analytical comparison of two commonly used read-out structures for pulse oximeters, in a wearable application context. The objective is to analyze and highlight the trade-off between the SNR and the power consumption. The proposed analysis clarifies, by the means of analytical equations, the impact of the input photocurrent, the photodiode parasitic capacitance, the feedback...
Variability of Low Frequency Noise (LFN) and Random Telegraph Noise (RTN) is a main concern in analog CMOS integrated circuits. For instance circuits such as current reference, SRAM, ring oscillators are ultimately limited by noise level and mismatch. In this work, CORNER DOPED devices have been fabricated, measured, and finally compared with standard CMOS technology with particular emphasis on weak...
We discuss the thermal noise and the effect of input noise sources on the output noise of plasmonic Field Effect Transistors operating in a quasi-ballistic regime. The input noise strongly affects the output noise at large signals and when the detectors operate near the threshold, where the highest responsivity is reached. In the detection regime with a finite drain current, 1/f noise becomes dominant...
The standard DC and RF and characteristics were measured for the 28 nm p- and n- type MOSFETs. The charge based compact model EKV3 parameters were extracted and verified against measured data. Noise parameters for both n- and p-MOSFETs were measured and analyzed in terms of gate induced noise correlation with the drain current noise, short channel effects related noise. The PRC noise model as well...
In this talk, we are briefly surveying our recent results [1] challenging the claim that the memristor is the “Missing circuit element” [2]. The crucial question is if the memristor equations guarantee that the device can be realized by passive components. With active components and feedback, arbitrary device characteristics can be realized. Recent work of Chua indicates [3] that certain type of memristor...
This work proposes an experimental demonstration of the stochastic resonance, a phenomenon widely observed in biology using a 65 nm CMOS artificial neuron. The stochastic resonance has been revealed through two different statistical studies. Moreover, when optimal, a signal to noise ratio at the output of the artificial neuron of 22.4 dB is achieved, for an ultra low power consumption, lower than...
Correlating noise figure measurements between R&D teams and manufacturing teams is becoming both more difficult and more important as LNAs are increasingly integrated with other components such as switches, filters and power amplifiers, to form a Front-End-Modules (FEM) used in wireless devices, thus the test systems must accommodate more complicated test scenarios than a simple LNA requires....
In this talk, we are briefly surveying our recent results [1–3] about two very popular yet often misunderstood concepts in physical informatics: (i) The existence of Johnson noise at near to absolute zero temperature has been debated many times yet it is generally accepted [1]. We point out the fundamental problems [2] with the particular approach the related quantum theories [4] of Fluctuation-Dissipation...
We give a classification of the different types of noise in a quantum dot, for variable temperature, voltage and frequency. It allows us first to show which kind of information can be extracted from the electrical noise, such as the ac-conductance or the Fano factor. And next, to classify the mixed electrical-heat noise, and to identify in which regimes information on the Seebeck coefficient, on the...
Solar energy is one of the most popular renewable energy sources. The control process of the photovoltaic system is usually based on the estimation of grid signal parameters. This paper presents an estimation method based on the FFT procedure, I class Rife-Vincent time windows and the 3-point spectrum interpolation. The accuracy in a real time system depends on several parameters: number of samples...
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