Soft X-ray cameras will be widely used in the ITER (International Thermonuclear Experimental Reactor) diagnostic system. To acquire their output data to display the signal changes on a computer, a PXIe (PCI Express eXtensions for Instrumentation)-based multi-channel data acquisition system for a soft X-ray camera has been designed and is presented in this paper. The Xilinx FPGA (Field-Programmable Gate Array) chip Kintex7-325T-900-2 is adopted as a controller in this system. The hardware’s composition and the PXIe bus transmission of this system are presented and discussed. The acquisition and transmission of the soft X-ray camera’s multi-channel data has been accomplished with subsequent processing. Currently, this system can collect signals within 1 MHz, and the system’s signal resolution has achieved 0.122 mV.
Human body communication method technology can transmit the data signal through human body that is suitable for healthcare and mobile devices. This technology uses the human body channel and therefore is greatly influenced by human body characteristics. Impulse response measurements were performed on 120 adult males to analyze channel characteristics of human body. The average signal loss was −67 to −65 dB depending on the transmission direction. In addition, the correlation between human body channel characteristics and body weight, skeletal muscle mass, body fat mass, total body water and transmission and reception direction signal loss were obtained. Through analysis of channel characteristics of human body medium, channel characteristics suitable for human body communication device are presented.
Thermal characterization with static test method , which utilizes I − V characteristics of power semiconductor devices to estimate junction temperature (TJ), has attracted attention for high density power conversion system design. However, the dynamic gate threshold voltage shift distorts TJ estimation for SiC MOSFET. This paper evaluates time response of TJ with junction voltage (VJ) for the developed SiC MOSFET, which embeds Schottky barrier diode (SBD) in this structure. This sophisticated structure enables to get accurate time response of TJ for SiC MOSFET, and hence to design dynamic thermal characteristics of power modules with SiC MOSFET.
This paper proposes a new adiabatic logic. Adiabatic logic is a good method to reduce power consumption. Several common adiabatic logics suffer from floating output which results in lack in robustness, by using the periodic power supply. At first, we analyze the floating phenomenon of previously proposed 2PC2AL in this paper. The proposed adiabatic logic can prevent the floating of the nodes to add two logic switches between the power supply and charging-discharging transistor. This paper also reports a comparison of energy dissipation between the different adiabatic logics such as, ECRL, 2N2N2P, 2PASCL, 2PC2AL, and the proposed circuit. In the SPICE simulation, the target application is a 4-bit multiplier for IoT products. Through the simulation, the output of the proposed circuit with cascade connection has a stable function.
N-well doping concentration plays an important role in single-event transient (SET) characteristic of transistors. While adjusting the N-well doping parameter within a proper range, it has little effect on the basic electrical performance of P-type MOSFET. The physical mechanism of well doping effects on the SET of PMOS is observed. The collapse and recovery of N-well potential, which are the critical factors that influences the SET pulse width, are analyzed by TCAD simulations. The result shows that well doping concentration could affect not only the rate of well potential recover to its equilibrium value, but the potential gradient induced by localized collapse of N-well potential between ion-strike path and source. Energy band analysis is also carried out under the triple well structure, and results show that an increase in well doping concentration will elevate the barrier of reverse-biased P-N junction and therefore cause the accumulation of holes in well, elevating the well potential, and consequently, inhibiting the parasitic bipolar amplification effect.
A unified trigger and payload design scheme was proposed and re-convergent logic was introduced to eliminate rare transition signals which may be taken as suspicious signals in existing Trojan detections. Two Trojan structure templates were proposed and they could be applied to both privilege promotion and deny-of-service attacks. By combining these two structures in different proportion and position, a Trojan benchmark generation algorithm was proposed in which Trojan variations were resistant to feature analysis based detections. The proposed Trojans can obtain a very low activation probability using only primary inputs, which can reduce the restriction on primary trigger signals. So the Trojans will have better operability and adaptability in Trojan insertion. Then we discussed the method to keep concealed in fault diagnostic. At last, we made a comparison between the proposed Trojans and the state-of-the-art Trojan benchmarks on structural and logical features.
Aiming at harmonic current influence on transmission characteristics in a magnetically coupled resonance wireless power transfer (MCR-WPT) system with a series-parallel (SP) structure, this paper develops a transmission characteristics expression method and a WPT system with a power factor correction (PFC) structure. Using the mutual inductance theory with harmonic current influence, the equivalent circuit model of the system was established and the formula for the transmission characteristics was obtained. An input current harmonic suppression method was developed, and a dual-boost PFC structure was designed on the transmitter side of the system to reduce the influence of the input current harmonic. According to the determined parameters, simulation analysis on transmission characteristics comparison between different systems was conducted. The experiment platform was built. The results of load experiment, frequency experiment and waveform analysis experiment show that the harmonic suppression and transmission characteristics were improved.
This letter proposes a UHF lowpass filter based on the image parameter method. This study designed, fabricated and assembled a 0.48-GHz semilumped lowpass filter using low cost FR4 substrate. It adopted a new layout concept for the air wound coils to achieve the purposes of compact size and good performances. The proposed UHF lowpass filter has the best performances for the roll-off rate and circuit size compared to previous works, and it also achieves the best figure of merit 973,369.