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Articles 1 - 10 of 10
Full-Text Articles in Electronic Devices and Semiconductor Manufacturing
Lna Integrates Fast Shutdown Function, Chin-Leong Lim
Lna Integrates Fast Shutdown Function, Chin-Leong Lim
Chin-Leong Lim
To minimize dead time in time domain duplex (TDD) transceiver, reception should ideally commence as soon as transmission ends. However, the low noise amplifier (LNA), which is typically shutdown during transmission to prevent device damage and receiver overload, can exhibit a turn-on delay. In older implementations, the shutdown function is external to the LNA device. So, one way to reduce part count and to miniaturize this class of LNA is to integrate the LNA and shutdown function in a microwave monolithic integrated circuit (MMIC). The integration also allows the shutdown circuit to be connected to the LNA at an optimum …
A Fast-Converging Mppt Technique For Photovoltaic System Under Fast Varying Solar Irradiation And Load Resistance, Saad Mekhilef
A Fast-Converging Mppt Technique For Photovoltaic System Under Fast Varying Solar Irradiation And Load Resistance, Saad Mekhilef
Saad Mekhilef
Under fast varying solar irradiation and load resistance, a fast-converging maximum power point tracking system is required to ensure the photovoltaic system response rapidly with minimum power losses. Traditionally, maximum power point locus was used to provide such a fast response. However, the algorithm requires extra control loop or intermittent disconnection of the PV module. Hence, this paper proposes a simpler fast-converging maximum power point tracking technique, which excludes the extra control loop and intermittent disconnection. In the proposed algorithm, the relationship between the load line and the I–V curve is used with trigonometry rule to obtain the fast response. …
Wave-Shaped Mask Of Fabricating Nano-Scaled Structure, Fang-Tzu Chuang
Wave-Shaped Mask Of Fabricating Nano-Scaled Structure, Fang-Tzu Chuang
Fang-Tzu Chuang
A wave-shaped mask for fabricating a nano-scale structure is disclosed. The wave-shaped mask comprises an elastomeric transparent substrate having an upper surface and a lower surface, and a light-penetrable thin film layer disposed on the upper surface of the elastomeric transparent substrate. The upper surface of the elastomeric transparent substrate and the light-penetrable thin film layer are in a periodic wave shape, and the lower surface of the elastomeric transparent substrate is in a plate shape.
Low Loss Configuration For Integrated Pin-Schottky Limiters, Chin-Leong Lim
Low Loss Configuration For Integrated Pin-Schottky Limiters, Chin-Leong Lim
Chin-Leong Lim
Compared to the PIN diode limiter, the Schottky-PIN limiter improves receiver protection, but has a higher insertion loss. Low cost, plastic packaged diodes can further worsen the loss. Diode stacking, mesa diode construction, and isolating the Schottky diode with a high-impedance quarter wave line or a directional coupler can reduce loss, but detrimentally raises the limiting threshold and/or adds bulk or cost. The PIN-Schottky limiter’s insertion loss can be improved by integrating the diodes’ parasitic capacitances into a low pass ladder network, but this solution requires the PIN diode to have two anode connections. Recently, the PIN-Schottky limiter was integrated …
Novel Configuration For Multilevel Dc-Link Three-Phase Five-Level Inverter, Saad Mekhilef
Novel Configuration For Multilevel Dc-Link Three-Phase Five-Level Inverter, Saad Mekhilef
Saad Mekhilef
new multilevel DC-link three-phase five-level voltage source inverter topology is introduced here. A multilevel DClink formed from single DC voltage supply and two cascaded half-bridge (CHB) power cells is connected to 12-switch threephase bridge in such a way that the proposed inverter produces five levels in the output voltage waveform. Compared to comparable inverters, such as symmetrical CHB and hybrid multilevel inverters, the proposed topology maximises the number of voltage levels and reduces the number of utilised DC voltage supplies, switches, gate driver circuits and installation area. A modified fundamental frequency modulation technique based on determination of switching states of …
Method Of Fabricating Wave-Shaped Mask For Photolithography And Exposure Method Of Fabricating Nano-Scaled Structure Using The Wave-Shaped Mask, Fang-Tzu Chuang
Method Of Fabricating Wave-Shaped Mask For Photolithography And Exposure Method Of Fabricating Nano-Scaled Structure Using The Wave-Shaped Mask, Fang-Tzu Chuang
Fang-Tzu Chuang
A method of fabricating wave-shaped mask is disclosed. The method of fabricating wave-shaped mask comprises the steps of providing an elastomeric transparent substrate comprising an upper surface and a lower surface, applying a stable force to the elastomeric transparent substrate for deforming the elastomeric transparent substrate, forming a light-penetrable thin film layer on the upper surface of the elastomeric transparent substrate, and removing the force applying to the elastomeric transparent substrate, whereby the upper surface of the elastomeric transparent substrate and the light-penetrable thin film layer are in a periodic wave shape and the lower surface of the elastomeric transparent …
Boundary Control Of Dual-Output Boost Converter Using State-Energy Plane, Saad Mekhilef
Boundary Control Of Dual-Output Boost Converter Using State-Energy Plane, Saad Mekhilef
Saad Mekhilef
A boundary control scheme for dual-output boost converter (DBC) with enhanced performance using second-order switching surface is presented in this study. The derivation of the switching surface is performed in state-energy plane rather than the state-plane to obtain a general geometrical representation that provides a good dynamic response during start-up and sudden load changes, achieving steady state in two switching actions. To illustrate the control characteristic and performance, a detailed mathematical analysis is fully developed and compared with other control methods for the DBC. The proposed control was simulated, implemented in a digital signal processor TMS320F2812, and tested using prototype …
Active Neutral Point Clamped Converter For Equal Loss Distribution, Saad Mekhilef
Active Neutral Point Clamped Converter For Equal Loss Distribution, Saad Mekhilef
Prof. Dr. Saad Mekhilef
No abstract provided.
Modified Incremental Conductance Algorithm For Photovoltaic System Under Partial Shading Conditions And Load Variation, Saad Mekhilef
Modified Incremental Conductance Algorithm For Photovoltaic System Under Partial Shading Conditions And Load Variation, Saad Mekhilef
Saad Mekhilef
Under partial shading conditions, multiple peaks are observed in the power–voltage (P–V ) characteristic curve of a photovoltaic (PV) array, and the conventional maximum power point tracking (MPPT) algorithms may fail to track the global maximum power point (GMPP). Therefore, this paper proposes a modified incremental conductance (Inc Cond) algorithm that is able to track the GMPP under partial shading conditions and load variation. A novel algorithm is introduced to modulate the duty cycle of the dc–dc converter in order to ensure fast MPPT process. Simulation and hardware implementation are carried out to evaluate the effectiveness of the proposed algorithm …
Long-Term Wind Speed Forecasting And General Pattern Recognition Using Neural Networks, Saad Mekhilef
Long-Term Wind Speed Forecasting And General Pattern Recognition Using Neural Networks, Saad Mekhilef
Saad Mekhilef
Long-term forecasting of wind speed has become a research hot spot in many different areas such as restructured electricity markets, energy management, and wind farm optimal design. However, wind energy with unstable and intermittent characteristics entails establishing accurate predicted data to avoid inefficient and less reliable results. The proposed study in this paper may provide a solution regarding the long-term wind speed forecast in order to solve the earlier-mentioned problems. For this purpose, two fundamentally different approaches, the statistical and the neural network-based approaches, have been developed to predict hourly wind speed data of the subsequent year. The novelty of …