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This paper firstly introduces the principles of SPWM (space vector pulse width modulation) and SVPWM (sinusoidal pulse width modulation), and then builds PMSM (permanent magnet synchronous motor) control system simulation models based on SPWM and SVPWM in MATLAB/Simulink environment. Finally, by comparing the simulation results of the two models, we got the advantages and disadvantages of SPWM and...
As memory speed goes up higher and I/O counts continue to increase, simulations estimating SSN-induced jitter are necessary for timing quality [1]. Traditional SSN-induced jitter simulation for high-density I/O designs normally calculates transient noise from multiple aggressors on one victim in one time domain simulation. Multiple number of simulations are required to ensure the signal pin with worst...
This paper presents techniques for increasing communication data rates for OOK modulated signals in the case the carrier frequency is generated by a cross-coupled pair LC oscillator. The proposed circuitry completely turns off the transmitter during the transmission of “0” bit and oscillation occurs only when the data bit is “1” to reduce power consumption. The data bit controls the steady state bias...
IEEE 802.3az standard (EEE), is the energy-aware alternative to legacy Ethernet. To save energy by extending the sojourn in the Low Power Idle state of EEE, packet coalescing has been proposed. While coalescing improves by far the energy efficiency of EEE, it is still far from achieving energy consumption proportional to traffic. Moreover, coalescing can introduce high delays. In this work, we use...
Non-pharmacological and non-surgical transcranial stimulation of the nerve function may provide new opportunities in evaluation and treatment of cranial nerve diseases. Stimulation can additionally help to uncover the mechanism of various brain processes by temporarily altering the normal function of healthy brains. Transcranial ultrasound stimulation(TUS) is in the early stages of human applications,...
In modern ICs, signal circuits like ADCs and DACs plays an important role in mixed signal processing. There are thousands of times that you need a signal in analog form. For example to process a signal or data generated by any computer there may be need a signal of an analog form. A simple example of it is a conversion of computer data into Audio-Frequency tones needs for telephony. This function...
Transmission systems using phased array antennas have been proposed, which made it possible to confine the communication area by switching the phase distribution for every symbol. These are known as directional modulation (DM), and the values of the phase shifters are chosen so that the phase of the desired signals on the constellation map is equal to those of the far fields of the phased array antenna...
Molecular electronics has the potential to miniaturize devices to atomic and molecular scales. This is significant given that CMOS devices are reaching fundamental limitations. The molecular orbital energies have been previously computed for a number of Benzene derivatives. The current flow in 1,4-Benzene Dithiol with Au electrodes has been analyzed using Hamiltonian and self-energies. The single...
To harness the power from solar has become a common phenomenon. Though the improvement in the efficiency of solar cell is gained up to 68% eventually against the claim of 85% by the manufacturers. To raise the overall efficiency of the solar system with the advent of power electronics engineering is also continuously performing an important and novel role. This paper proposes switched inductor buck...
A switch-based technique has been presented for efficient inductive power transmission at large coupling distances. Unlike the conventional inductive link, in which the receiver (Rx) LC-tank is utilized as a voltage source, the proposed link switches the Rx LC-tank in a novel fashion to act as a current source. Therefore, the voltage across the load (RL) can be significantly larger than the Rx LC-tank...
This paper presents a novel generalized topology of a multilevel inverter. The proposed topology is obtained by extending the developed H-bridge topology. The proposed topology is competent to generate the optimum number of output voltage levels by using minimum number of dc voltage sources. The topology offers reduced value of voltage stress on semiconductor power switches. Utilization of dc voltage...
There is a need to improve the power quality of the grid as well as the power factor implied on the grid due to the nonlinear loads connected to it. A new single phase bridgeless AC/DC power factor correction (PFC) topology to improve the power factor as well as the total harmonic distortion (THD) of the utility grid is proposed in this research. By eliminating the input bridge in conventional PFC...
This paper introduces a robust, hardware efficient, mixed-signal control loop that governs the switching actions of the secondary-side synchronous rectifier (SR) switches of LLC resonant converters. The new SR control method minimizes switching and conduction losses of the SR switches through online optimization of their on-off timing using an auto-tuning process that takes into account the effect...
To take out a variable frequency variable amplitude output voltage a new single-phase H-bridge multilevel inverter (MLI) topology is constructed through VFISCPWM modulated semi-cross switched voltage sources along with a hybrid pulse width modulation (PWM) strategy. The principle avoids a shrewd attitude to employ PWM approach only for a meticulous H bridge that serves to produce the desired level...
Phase shifters present the key components in the field of phased array antenna. They are used to electrically shape and steer the antenna beam. In this paper, the design and simulation of S-band 6-bits phase shifter based on semiconductor switch is suggested. The proposal is designed by combining the properties of reflection and switched lines and it consists of two stages. The first stage is realized...
The grid connectivity requirements imposed today, ask for an accurate controller design able to deal with system constraints and nonlinearities. In order to fulfill grid international standards, this paper details a Finite control set model predictive controller called FCS-MPC as part of controlling an energy conversion system. It uses a discrete time 3L-NPC inverter model (in the α-β frame) to predict...
This work presents the implementation of an 11 Bit pipelined successive approximation register ADC (PSAR) in a 65 nm technology. The proposed ADC utilizes comparator-based switch-capacitor circuits and zero-detection in order to enable fast and high linear residue amplification with at reasonable area costs. Simulation results indicate conversion rates of 4.4 MSPS and energy consumption of 48.8 fJ...
In this paper, a disturbance observer (DOB) algorithm is proposed to solve the output voltage regulation of an Interleaved Boost Converter (IBC) in presence of unknown disturbance and parameter uncertainty. IBCs are improved model of boost converters which provide better operation than conventional converters. Also, these converters are rather complicated, therefore, the modeling of them are more...
Multilevel converters are attractive solution for high-power high-voltage applications such as motor drive systems, active filters, and flexible AC transmission systems (FACTS). Several modulation techniques are proposed for multilevel converters. Among them, selective harmonic elimination (SHE) offers high quality voltage waveform with low switching frequency which is especially suitable for high-power...
Green cloud is a highly developed packet-level simulator used to compute energy focusing on the energies consumed by various data centers including servers, network switches. Green cloud simulators are helpful in generating solutions for arranging loads for different number of machines, maintaining and safeguarding the resources, developing the rules required for delivery and also gaining results...
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