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For high spectrum usage, some independent wireless communication systems should share multi-channel environment. An offloading effect over multi-channel makes system throughput enhanced. A multi-channel access based on channel activities of other systems, which are channel occupancy ratio (COR), is important. The estimation of COR needs a traceability to the transition of COR. In software define radio,...
An externally triggered analog sampling circuit used as an alternative to a high speed analog-to-digital converter (ADC) in microcontroller systems is designed, fabricated and characterized. High speed ADCs are expensive in terms of cost and power dissipation, the fast transient digitizer (FTD) is a low cost alternative and has no appreciable DC power dissipation. The transient digitizer uses cells...
Parallel-connected IGBTs are prone to large-current destruction in high-power applications due to current unbalance between each IGBT branches. This paper proposes a novel control method to improve the current balance in order to protect the device against over current destruction. The method uses two control loops to confine the current rising speed as well as to reconcile the current change start...
A general model is developed to study how network routing can be reconfigured quickly without incurring transient congestion. Assuming both initial and target configurations are congestion-free, it is known that transient congestion may still occur during the reconfiguration process if links contain a mix of traffic flows following old and new routing rules, resulting from variation of switch reaction...
Insulated gate bipolar transistors (IGBTs) are usually connected in series to satisfy the requirements of high-power and high-voltage in power electronics applications. However, due to the parameter deviations of the series-connected IGBTs, it is difficult to ensure an equal voltage sharing between them during both transient and steady-state operations. This paper proposed a novel active gate drive...
This paper presents a gate driver integrated circuit (IC) for Silicon Carbide (SiC) devices to fully utilize their high switching speed capabilities in a phase-leg configuration. Based upon the intrinsic properties prevalent in SiC devices, gate assist circuitry is integrated into a gate driver IC to control the gate voltages seen by both devices in a phase-leg during different switching transients...
Gate drives of today's high-voltage insulated gate bipolar transistors (HV-IGBTs) are in most cases voltage source based and with fixed gate resistors. Consequently, the contradiction between high-speed switching for minimized power loss and low-speed switching for low noise and low switching stress cannot be resolved simultaneously. This paper proposes a novel active gate drive (AGD) which operates...
In this paper, Low power and high speed regenerative double tail dynamic latch comparator for a application of high speed analog to digital converter has been designed. A proposed comparator has increased the speed of the circuit. The proposed regenerative double tail dynamic latch comparator has a good performance to conventional comparator. It is designed in Cadence UMC 180 nm CMOS process with...
This paper continues to build on the dynamic current transient estimation method introduced in previous work. Our previously introduced method uses pre-characterized data from standard cells to estimate the total current transient of a path. This method eliminates the necessity of running resource intensive full-chip SPICE simulations to estimate the current transient of a path. Novel contributions...
Variations in the power-distribution network are exacerbated because of scaled supply voltages and smaller noise margins in sub-nanometer designs, which adversely affect performance and yield. Power-Supply noise incurred by excessive simultaneous switching of multiple paths negatively impacts the timing of a circuit. Supply noise is a major issue especially during transition and delay test where test...
To reduce the power dissipation and switching stress of high power IGBTs during switching transient, a new active gate drive method based on voltage controlled current source (VCCS) is proposed in this paper. Compared to the conventional gate drive (CGD) for IGBTs, the proposed current source gate drive (CSD) method achieves faster switching speed and effective control on current overshoot at turn-on...
This paper investigates how to integrate state-trajectory control functions of LLC resonant converter within a commercial low-cost microcontroller, including Simplified Optimal Trajectory Control (SOTC) for load transient, burst mode and soft start up. Simplified calculation process is proposed for SOTC to minimize digital delay. Guideline to select a proper microcontroller is presented to limit calculation...
Intense multi-THz transients are controlled on a sub-cycle timescale using an ultrafast plasma mirror. We monitor the temporal slicing via ultrabroadband electro-optic detection of the electric field.
The control problem of the plant, which is characterized by the different response delay for the rise and fall of the plant input has been analyzed. It is shown that the modified PI controller with the switched values of parameters enables improving the control quality of such plant.
Nowadays, many devices are equipped with computer network interfaces. Some systems of area such as security of finance and real-time communication, synchronizing distributed clocks, rapidly, to enable their operations is imperatively required. The implementation of distributed embedded architecture which is based on IEEE 1588 standard to achieve a precise time synchronizing system is investigated...
A novel high-speed and low-power negative level shifter suitable for low voltage applications is presented. To reduce the switching delay and leakage current, a novel bootstrapping technique is designed for the level shifter. Furthermore, a pull-down driver is proposed to have high driving capability under different operation modes. The circuit has been designed in 130 nm 1.5 V/5 V triple-well CMOS...
The transient simulation of threshold switching in phase-change memory (PCM) devices is essential for the prediction and optimization of cell behavior depending on the circuit parameters and for the understanding of the ultimate limit of operation speed. This paper presents a simulation study of threshold switching in PCM devices aimed at investigating the role of delay and switching times in cell...
A dual-voltage-loop digital control architecture with non-linear control algorithm is proposed in this paper. An adaptive voltage positioning (AVP) control unit was generalized to achieve adaptive voltage positioning, by generating dynamic voltage reference and dynamic current reference. A dynamic reference step adjustment method lowers the high speed requirement of reference updating clock; a non-linear...
Threshold switching effects play a critical role in phase change memory (PCM) devices, since they contribute to the programming (set/reset) times and may lead to unwanted disturbs during the read operation. This work presents a detailed characterization and modeling of transient effects of delay, switching and recovery in PCM devices, allowing to quantitatively evaluate the statistical impact of read...
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