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Random mismatch errors in the resistor networks are one of the dominant nonlinearity sources for high resolution and high accuracy resistor DACs. It is rigorously proven and verified that ordered element matching (OEM) technology could significantly reduce the random mismatch errors. This paper proposed a novel 20-bit three-segment R-2R DAC structure based on OEM theory. It can achieve high matching...
A practical system for reading out from linear, multi-level, selectorless Resistive Random Access Memory (RRAM) arrays based on a Trans-Impedance Amplifier (TIA) approach is presented and studied. SPICE simulation of the core of the system is performed in order to extract predicted sensitivity to error factors such as non-zero TIA offsets and access resistance. A physical implementation of the system...
The ability of SMAs to respond reversibly to an external stimulus by modifying their dimensions can be used to generate motion or force in electromechanical devices and micro-machines. There are several works that demonstrate SMAs are serious alternatives as micrometric actuators, obtaining accuracies around 3 µm in position control if high-quality position sensors, such as LVDTs, are used to feedback...
The emitter series resistance is a very important parameter for bipolar transistors since it can have a significant impact on both the DC and high-frequency characteristics of transistors. Its accurate determination is quite difficult due to the complicated emitter material stack and the lack of suitable test structures. Thus, extraction methods that rely on transistor terminal characteristics must...
Accurate measurement of FET gate resistance is needed to support technology development and to understand its impact on RF performance. This is especially true for high-K Metal Gate Fin FET technologies. Decreasing gate capacitance with each successive technology node has made gate resistance measurement increasingly difficult. This work presents a "Virtual De-Embedding" approach to the...
With the development of modern science and technology, many high technology fields have entered the nano-world, such as processing and manufacturing of aerospace products, precision measurement devices, and high density integrated circuits and so on. Close to the nanometer scale with the characteristic size of atoms and molecules, the general conventional techniques are no longer applicable, and therefore...
Galvanometer is used for zero or balance indicating, plays an important role in the electrical, temperature and chemical metrology area. As a result of the existing galvanometer verification device can only work for current type galvanometer measurement, most laboratory can't measure voltage type galvanometer. In this paper, we designed a compound type galvanometer verification device which can both...
This article describes theoretical and experimental studies of the noise influence in direct current measurements by means of measures of voltage and resistance, as well as by serial precision ammeters and DC current calibrators. It was shown that the shot noise restrict the measurement accuracy level of dc current in this measurement range.
Recently Electronic Textile (E-Textile) technology enables the weaving computation and communication components into the clothes that we wear and objects that we interact with every day. E-Textile enables the design and development of a broad range of pervasive sensing systems such as smart bed sheets for sleep posture monitoring, insoles in medical shoes for monitoring plantar pressure distribution,...
This paper introduces a system design of high-precision resistance meter based on a high-performance microprocessor MC9S08AC16 and a high-resolution A / D converter AD7705. The system block diagram, hardware circuits, software and test results are given. Functions such as automatic range switching, zero adjustment, software error compensation and auto distinguish based on error level are added to...
S/DRM testing methods usually use long, heavy cables to connect high current source from ground to the circuit breaker. Alternative is to move current source close to the circuit breaker by using heavy batteries, transformers, dc/dc etc. In new proposed method batteries are replaced with ultra capacitors and constant current charger, resulting in a few hundred grams of powerful current source, capable...
The contact resistance is the key factor influencing the performance of slip-ring, which seriously affects the reliability of the signal transmission. This paper describes the design of a multi-channel, small-signal, high precision automatic test system (ATS) for slip-ring contact resistance measurement, and it has been used in the production of slip-ring at factory.
We present a detailed study of ρxx and ρxy measured on a large high-quality epitaxially grown graphene sample. We have investigated the bias current, temperature, and magnetic field dependence and demonstrate quantization better than 1 part in 108. This level of accuracy easily satisfies all the usual criteria for reliable traceability based on the quantum Hall effect.
S/DRM testing methods usually use long, heavy cables to connect high current source from ground to the circuit breaker. Alternative is to move current source close to the circuit breaker by using heavy batteries, transformers, dc/dc etc. In this proposed method batteries are replaced with ultra capacitors and constant current charger, resulting in a few hundred grams of powerful current source, capable...
Hamon transfers allow accurate comparison of resistance value of standards in 1:10 and 1:100 ratios. In the paper idea of construction design and development of the Hamon transfers, used for resistance unit transfer from the primary standard QHR (Quantum Hall Resistance) to high value resistance standards up to 100 TΩ, in which factors influencing transfers uncertainty were minimized, has been shown.
Main reasons why nonlinear errors exist in the process of temperature measurements with platinum resistors have been analyzed in accordance with the nonlinear characteristic of platinum resistors. Then, the principle of two nonlinear compensation algorithms, such as Genetic algorithm, Newton iteration method is introduced. At last, measuring data based on single-chip computer temperature measurement...
The high-precision temperature measurement system which adopts ARM processor LM3S1138 as controlling core was introduced in this paper. In the temperature measuring circuits, the current driving circuit of sensor Pt100A and A/D converting circuit adopt the same reference voltage, which makes A/D conversion results are only dependent on the changing value of platinum resistance with the temperature...
This paper introduces a design method of the Material Location-Measuring Device Based on the Loading Transducer. Referring to the principles of the electronic scale, this device transforms the weight of material into the height through calculation, thus achieving the goal of measuring the material location. The part of the hardware includes strain resistance, signal detecting circuit, data acquisition...
The field of electronic noses and gas sensing has been developing rapidly since the introduction of the silicon based sensors. There are numerous systems that can detect and indicate the level of a specific gas. We introduce here a system that is low power, small and cheap enough to be used in mobile robotic platforms while still being accurate and reliable enough for confident use. The design is...
In this study, we fabricated in-plane thermoelectric micro-generators (4 mm times 4 mm) based on bismuth telluride thin films by using flash evaporation method. The thermoelectric properties of as-grown thin films are lower than those of bulk materials. Therefore the as-grown thin films were annealed in hydrogen at atmospheric pressure for 1 hour in a temperature range of 200 degC. to 400degC. By...
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