Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"Loop Gain"”.
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ML for Loop Gain Identification of DC/DC Converters
Control loop identification is necessary for evaluating the stability of switched power supplies and is therefore an important step during design and verification. Analytical models of power supplies often yield inaccurate predictions of the loop gain; therefore, power engineers traditionally must …
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Small-signal analysis and design of a distributed power system
… are analyzed, and an expression for the loop-gain of a parallel-module system is obtained. It is found that a parallel module system can be configured so that the loop-gain of the system is independent of the number of modules. The effects of placing switching regulators in cascade are …
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Design and Development of High-Frequency Switching Amplifiers Used for Smart Material Actuators With Current Mode Control
… behavior. Since the low frequency current loop gain tends to be low due to the circuit's capacitive load, average current mode control is further proposed to boost the low frequency current loop gain and improve the amplifier's low frequency performance. Both of the circuits have been …
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Modeling and Design of a Monolithic High Frequency Synchronous Buck with Fast Transient Response
… ASIC. Achieving this requires an accurate loop gain design, especially for monolithically integrated high frequency switching converter since compensator is fixed on silicon and loop delay is comparable with switching cycle. Since DC-DC switching converters are time-varying system, …
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Analysis and simulation of dynamics of spacecraft power systems
… for the three modes of operation. The system loop gain is defined. Design guidelines for the feedback control loop of the shunt regulator, battery charger and discharger are developed to shape the system loop gain for the optimum bus dynamic performance and stability of the system. Designed …
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Stability of distributed power supply systems
… subsystems is examined. By applying the loop gain analysis technique, a forbidden region for the polar plot of the ratio of impedances at the interface between cascaded subsystems is determined. A method of transforming the forbidden region into a load impedance specification for a given …
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Modeling and measurement of switching converters
… deficiency of analog modulation technique for loop gain measurement under certain circumstances. The digital modulator, on the other hand, always provides accurate measurement data. The accuracy of the discrete-average model is verified by measurement data using the digital modulator.
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Virtual ground reference buffer technique in switched-capacitor circuits
… between the feedback factor and the signal gain. This thesis proposes the virtual ground reference buffer technique that enhances performance by improving the feedback factor of the op-amp without affecting signal gain. A key concept in the technique is the bootstrapping action of …
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High power shunt regulation of spacecraft solar arrays
… The input filter is shown to affect the closed loop design of the system, as well as its weight. Analysis and modeling techniques are developed for a sequential shunt unit. The analysis of bus impedance and loop gain is verified against measurements on hardware. The factors that affect the …
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High Gain Low Power Operational Amplifier Design and Compensation Techniques
… method can be easily applied to the popular two gain stage op amp architectures with very little alteration. MOS devices are used in the weak inversion region or the subthreshold inversion region to minimize dc source power. A feasible configuration for high gain, low power op amp design …
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An analog VLSI front end for pulse oximetry
… distributed (cascaded) amplification, automatic loop gain control, and parasitic capacitance unilateralization to improve the performance and ameliorate certain shortcomings of existing logarithmic photoreceptors. These improvements allow us to reduce LED power significantly because of a more …
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High-Frequency Modeling and Analyses for Buck and Multiphase Buck Converters
… order to save the output capacitors, the control-loop bandwidth must be increased. However, the bandwidth is limited in the practical design. The influence from the switching frequency on the control-loop bandwidth has not been identified, and the influence from multiphase is not clear, either. …
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New architecture for RF power amplifier linearization
… As the Cartesian feedback loses its loop gain in high frequencies, the predistorted signal gradually takes over the linearization role. Effectively, this increases the operation bandwidth of the Cartesian feedback and allows wide-band transmission. For digital predistortion, the …
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The interrelationship between central sleep apnea and atrial fibrillation
… a variety of data on sleep pathology, high loop gain status, left ventricular ejection fraction and positive airway pressure therapy efficacy and compliance. Patients were considered to have central sleep apnea if home testing results demonstrated a central apnea-hypopnea index of 5 or …
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Direct Digital Control of Inertial Guidance Sensors
… controller. Sensitivity of the system to control loop gain variations and mismatch in the controller elements is examined. Sensitivity analysis is exploited to allow overall compromise between response speed and the system sensitivity. The need for high frequency sampling in the control loops …
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Linearity improvement technique for CMOS continuous-time filters
… By novel application of systematic feedback loops and by placing the nonlinear elements inside the feedback, the distortion resulting from the nonlinear devices is greatly reduced by the filter loop gain. Theoretical and experimental results, in agreement, show a significant improvement in …
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DQ-Frame Small-Signal Stability Analysis of AC Systems with Single-Phase and Three-Phase Converters
… supply units, proposing an impedance model and a loop gain model based on dq-frame analysis. These models have been validated through extensive experimental testing, demonstrating their effectiveness in stability analysis across a range of system configurations, including single-phase, three-phase …
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Phase Shift Control: Application and Performance Limitations With Respect to Thermoacoustic Instabilities
… instabilities are generated with increasing loop gain. This thesis investigates the general underlying cause of the secondary instabilities and shows that high average group delay through the frequency region of the instability is the root of the problem. This average group delay is then …
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Evaluation of A New Power-Hardware-In-The-Loop (Phil) Interface Algorithm For Current Controlled Amplifiers
<p>The use of Power-Hardware-In-the-Loop (PHIL) system studies is on the rise, in simulation and validation testing of designs for new products and systems. All PHIL systems can be split into three portions: the computer simulation model, the physical hardware component of interested, and the …
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Continuous Phase Synchronised Drives (for a rod-making machine)
… controller with a proportional velocity loop within a proportional position loop with velocity feedforward was designed. Local control schemes were investigated as means of reducing relative errors between drives: the slave of a master/slave scheme compensates for the master's errors: the …
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