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This paper analysis and compares the different driving techniques for the brushless DC motors (BLDC). First, the conventional block commutation technique used to drive the BLDC is discussed with respect to the produced torque ripple. Second, the modified techniques like the overlap and phase advance techniques discussed as well. Finally, a combined driving technique including the phase advance and...
A low power switching method for SAR ADC is proposed in this paper. With this switching method the comparator first compares the sampled input voltage with Vref/2 to generate the MSB and determine whether to use Vref/2 or Vref as the comparator reference voltage in the following conversation steps, and the DAC with a split capacitor array uses Vref/2 as the reference voltage to generate the remaining...
For future low-priced electronics, high performance thin film transistors (TFTs) are highly desirable. One possible way towards device optimization is the downscaling of the channel length (L) which allows higher device density, smaller device configuration and better performance. In this paper, we present a simulation study of bottom gate TFTs based on ZnO as semiconductor, SiO2 as insulator layer...
The carbon nanotube field-effect transistor (CNTFET) has been advocated as one of the possible alternatives to replace the MOSFET. Some of the likely defect types that may occur in its manufacturing process are the presence of undeposited CNTs and the change in CNT diameter. Existing simulation models are inadequate to assess the effect of undeposited CNTs, due to the limitation in representing these...
This paper presents the design of a 3 phase Cyclo-converter which can be used for high frequency application. The load must be the RLC load for obtaining a constant voltage at 30 KHz which is resonant frequency. It can be operated at unity power factor. The cyclo - converter can also be made functional to convert the low frequency alternating current to High frequency alternating current. Here we...
The LC filter introduced to the AC side of three-phase current source PWM rectifier, brought leading power factor. In addition, because of the nonlinearity of the PWM rectifier, the satisfactory effect could not be obtained with the traditional PID control system under larger disturbance and changes of controlled object. This paper described the technology of Combining traditional PID control with...
This paper describes the implementation of fuzzy based Handwriting Recognition (HR) system in VHDL. Key motivation of the design is to reduce computational complexity and performance enhancement. Fuzzy intelligent technique is used to tackle inherent ambiguities in different handwriting recognition. This system is capable of recognizing handwritten characters such as one segment, distinguish characters...
In depletion-all around (DAA) operation of SOI four-gate transistor (G4-FET), the conducting channel can be surrounded by depletion regions induced by independent vertical MOS gates and lateral JFET gates. This enables majority carriers to flow through the volume of the silicon film far from both silicon/oxide and p+ gate/n-channel interfaces. A numerical model using FEMLAB with MATLAB is developed...
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