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A fully-synthesizable Physically Unclonable Function (PUF) with hysteresis-enhanced stability and active compensation of temperature variations is proposed. In detail, a bitcell based on low-voltage regulated Cascode current mirror is introduced. To reduce undesired bit flips, hysteretic behavior is obtained through the insertion of a Muller C-element output stage, which mitigates the effect of noise,...
Thermal error is the key error source which affects the stability of machining accuracy and temperature measurement point optimization is the premise and difficult to achieve accurate thermal error compensation. In order to reduce the temperature measurement point and improve the efficiency of temperature data acquisition, The method is proposed based on principal component analysis (PCA) and Single...
We report temperature-dependence and temporal stability studies of AlxIn1−xAsySb1−y-based avalanche photodiodes (APDs). Multiplication gain and breakdown voltage of AlxIn1−xAsySb1−y APDs have shown low gain-temperature coefficients for a wide range of temperature.
Phase Change Slurries (PCS) are viewed as an emerging technology in the field of comfort cooling. This kind of fluids have a much greater apparent specific heat capacity than conventional single-phase fluids and the heat transfer rate between the PCS and the wall of the heat exchanger may be enhanced. This study deals with the heat transfer behavior of a paraffin-in-water emulsion, especially the...
We designed, simulated and experimentally characterized thin silver microheater structures placed on a dielectric multilayer membrane, which represent the concept of vertical-cavity enhanced resonant thermal emission (VERTE). This concept has the goal to achieve selective and coherent thermal emission on the backside of the multilayer membrane. The dielectric stack also is responsible for the thermal...
Electric power transmission lines span through wide geographical areas, experiencing different ambient conditions. Varying weather conditions along the length of the line introduce changing conductor temperatures and hence non-uniform distribution of line electrical parameters along its length. This non-uniform distribution of electrical parameters is expected to impact line power handling capabilities...
Surface acoustic wave (SAW) devices have been shown recently to be an appropriate technology for harsh-environment sensor applications, such as those in the automotive, aerospace, power plant, and metallurgic industries. Usages include temperature, pressure, torque, strain, gas, liquid, biochemical, and mass sensors in structural health monitoring, industrial process monitoring, environment checking...
Surface acoustic wave (SAW) sensors have been finding increased usage in a variety of manufacturing and automotive industries as torque, temperature, and pressure sensors. Gas, liquid, biochemical, strain, and mass sensors are other promising applications for aerospace, power plants, process dynamic monitoring, structural health monitoring, and condition-based maintenance. For high-temperature harsh-environment...
This article investigates the influence of oxygen-containing groups on the properties of CNTs and CNT-supported catalyst. The carbon nanotubes were treated using H2O2 solution and by annealing in Ar atmosphere (800°C) in order to introduce and to eliminate oxygen surface functionalities, respectively. Their properties of CNTs were investigated using TGA, XRD, BET, and TPD-NH3. The reducibility of...
The so called protein dynamical transition has long been associated with thermally activated excitations of the solvent adjacent to the polypeptide surface. Recently we reported the somewhat surprising result that the low temperature (<270K) terahertz absorption measurements of a series of red fluorescent protein showed an increase in the dynamical transition temperature with photobleaching, and...
Physically unclonable functions (PUFs) facilitate many security applications such as secure key generation, device authentication, counterfeiting detection and prevention. This paper presents an area efficient PUF with high reliability. We exploit the process variation of a single load transistor for the current mirror working at the subthreshold region, which is converted to a unique digital signature...
Silver-based conductive ink is the key material in printed electronic technology. With the development direction of the electronic products to the miniaturization, flexibility direction, the traditional micron-grade metallic silver conductive ink has been unable to meet the requirements of low sintering temperature and printing precision. In this case, nano-silver ink should be developed. In this...
Due to the constant temperature oven, the OCXO can have a higher frequency stability in both long-term and short-term comparing to other crystal oscillators. However, most of OCXOs are using passive temperature control components, such as heating resistors or power transistors, which makes OCXOs have long warm-up time and ease to be affected by the ambient temperature fluctuation. In this paper, demonstration...
A system clock is implemented with a 2.52 GHz MEMS-based oscillator, divider, temperature sensor, digital PLL, and active temperature compensation to generate a 48 MHz frequency reference with ±10 ppm stability from −40°C to 105°C. An on-chip 32 kHz RC oscillator is also periodically calibrated by this reference clock to achieve ±500 ppm accuracy, allowing it to be used as the wireless node sleep...
We perform experiments with White Rabbit for time and frequency dissemination over long distance optical fiber links. We consider a unidirectional link setup to ensure compatibility with active telecommunication networks and build the first four-span 500 km cascaded White Rabbit link, using commercial White Rabbit equipment and improved software parameters. We demonstrate a frequency transfer stability...
Piezoresistive sensing has been regarded as an effective transduction method in MEMS resonator researches and piezoresistive micromechanical oscillators are therefore of great interests. The induced joule heating in the piezoresistive sensing, however, has a strong effect on the performance of the device. In this work, a micromechanical double ended tuning fork (DETF) based piezoresistive oscillator...
A technical solution to combine the advantages of a new generation's DOCXO ensuring ∼E-11 vs. temperature with ADEV of 1…2E-13 for 1…10 s has been created. It should be noted that a frequency stability vs. temperature change considerable improvement (up to 2…3E-11 for 55°C) allows reliable measurements of ADEV at 10 s (2E-13 as normal value) and considerably improves phase noise measurement for 0...
In this paper, prototypes of SC-cut resonators with 5 MHz resonant frequency are presented. The resulting short-term stability of some resonators has been measured lower than 8·10−-14 in terms of Allan standard deviation. The results are compared according to the overtone behavior on different vibrating modes to find a correlation with the intrinsic noise of the resonators. The comparison of these...
This paper presents the implementation of an active fiber optical-delay stabilization system in an optoelectronic oscillator. The primary use of the system is to stabilize optical point-to-point fiber links for synchronization purposes; however, the system can also be efficiently used as a stable optical delay line in an opto-electronic oscillator. By using a multipurpose optical delay stabilization...
A GPS-disciplined oscillator (GPSDO) provides a cost-effective alternative to a primary clock such as a cesium-beam atomic clock. A rubidium (Rb) atomic oscillator is usually employed in a GPSDO as a holdover clock where maintaining the most accurate time is required during an extended absence of GPS signals. A commercially available Chip-Scale Atomic Clock (CSAC) offers a comparable long-term stability...
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