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 21 for “"Phase margin"”.
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Vibrational Control of a Cantilever Beam Using Sensor and Actuator Averaging Methods
… single-actuator system that achieves a phase margin of 31° and bandwidth of 3.5 kHz. We then use the same controller but implement a sensor averaging method to achieve a phase margin of 45° with the same bandwidth. Therefore, we increase our phase margin by almost 50% at almost no cost …
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AUTOMATIC TUNING OF PROCESS CONTROLLERS : PRACTICAL APPROACHES
… analytical tuning formulas based on gain margin and phase margin are derived. These analytical formulas are particularly useful in the context of adaptive control and auto-tuning where the controller parameters have to be computed on-line. Unlike other analytical formulas, the desired …
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Two-Stage Operational Amplifier Design by Using Direct and Indirect Feedback Compensations
… performance which has a 70dB DC gain, a 60◦ phase margin, a 25MHz gain bandwidth, and a slew rate of 20 V/us requirements. All the designs and simulation results are based on a 180mm 1.8 V standard TSMC CMOS technology. Ultimately, the traditional Miller compensated Op-Amp (a single …
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A low-power, high-bandwidth LDO voltage regulator with no external capacitor
… for the same topology. Tradeoffs involving phase margin and load capacitance are also explored. In simulation, the regulator provided an output of 1.3 V from an unregulated 1.8 V supply, using a 0.75 V reference. By exploiting the tradeoffs between PSRR, bandwidth, and power consumption, a …
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Inductive compensation of operational amplifiers in feedback circuits
… loop characteristics. My chip consisted of a marginally unstable two-pole amplifier, and a compensated but otherwise identical amplifier. Comparing the step responses of the original and compensated systems proved that the compensator successfully stabilized the unstable system. I used …
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A Permanent Magnetic Dipole Reaction Sphere Actuator for Spacecraft Attitude Control
… controller with a loop crossover of 60 Hz and phase margin of 30°. The rotation controller is a filtered proportional (P) controller with a loop crossover of 20 Hz and phase margin of 60°. We implement the commutation laws and controllers in real-time on a National Instruments PXIe-8135 …
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Nonlinear Control System Stability Metrics via A Singular Perturbation Approach
In this dissertation, Singular Perturbation Margin (SPM) and Generalized Gain Margin (GGM) are proposed as stability metrics for Linear Time-Invariant (LTI) systems, Linear Time-Varying (LTV) systems, Nonlinear Time-Invariant (NLTI) systems and Nonlinear Time-Varying (NLTV) systems, which are: (i) …
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Linearization of RF Power Amplifiers
… shows how RF amplifier non-linearity, the RF phase adjuster setting, loop gain, bandwidth and delay affect stability. A graphical interpretation of the analysis is given that indicates how stable a given RF amplifier will be when setting up a practical cartesian feedback loop. Instability is …
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Two new extensions to L1 adaptive control theory
… of the new adaptive law is the additional phase margin in the estimation loop, allowing for accommodation of first order sensor dynamics in the state predictor. An additional benefit is the reduction of the required computational resources, since the error bounds reduce at a rate directly …
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Torque Accuracy Improvement Via Explicit Torque Feedback Control For Internal Combustion Spark Ignition Engines
… findings include an improvement of 14% in gain margin and 60% in phase margin when the torque feedback is applied to the cruise control torque request at the simulated operating point. This study demonstrates that the direct torque feedback is a powerful technology with promising results for …
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Modeling, Design, Identification, Drive, and Control of a Rotary Actuator with Magnetic Restoration
… domain indices like bandwidth, robustness, phase margin, sensitivity, disturbance rejection. A method of eddy-current plated is also proposed for inductance reduction. In the end, a new effectiveness index is proposed.
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An application of robust H₂/H[infinity] control synthesis to launch vehicle ascent by Tyler Nicklaus Hague.
… pitch control laws that provide 6 dB of gain margin and 302 of phase margin. The sensitivity and high-order of traditional H2/H [infinity] synthesis are addressed through the implementation of uncertainty in the design model and the application of balanced, model order reduction on the …
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Single Phase Power Factor Correction Circuit with Wide Output Voltage Range
… a wide output voltage range is needed. A single phase power factor correction circuit with wide output voltage range is developed in this work. After a comparison of two main power stage candidates (Buck+Boost and Sepic) in terms of efficiency, complexity, cost and device rating, the buck+boost …
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High Gain Low Power Operational Amplifier Design and Compensation Techniques
… narrows the bandwidth. It can improve the phase margin as well as optimize the bandwidth of the op amp. The proposed feedforward compensation 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 …
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Innovative Structural and Mechanical Satellite Systems
… is shown to be robust in these conditions, with margins of safety of stress ranging from 19.97 to 37.56 and deformation of the stack of circuit boards not exceeding 0.05 mm. The minimum frequencies of modes of vibration throughout the structure occur at 623 Hz, which is well above the allowed …
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Adaptive Controller Development and Evaluation for a 6DOF Controllable Multirotor
… standard certification methods, such as gain and phase margin. A method for using time delay margin estimates, a potential certification metric, to tune the adaptive parameter tuning gain matrix is shown to be useful when applied to an augmented MRAC controller for a quadrotor.
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Detection of ESD-induced soft errors
IEC-61000-4-2 compliant ESD discharges are performed on a microcontroller. The effect of ESD-induced noise on a digital system having a workload is examined. UART interface present on-chip is used for memory and register readout. Hardware voltage monitors developed previously are included in the …
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Advanced Control Schemes for High-Bandwidth Multiphase Voltage Regulators
… the control bandwidth (BW) of the multiphase voltage regulator (VR) is a more cost-effective and space-saving approach. However, it is found that the stability margin of current-mode control in high-BW design is very sensitive to operating conditions and component tolerance, depending on …
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Design, Modeling and Control of Bidirectional Resonant Converter for Vehicle-to-Grid (V2G) Applications
… to design the control loop. The bandwidth, phase margin and gain margin of the control loops should be properly designed to guarantee a robust system. The dynamic analysis of the resonant converters have not been extensively studied, with the previous work mainly concentrated on the …
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Development of Low-power Wireless Sensor Nodes based on Assembled Nanowire Devices
… this thesis includes the design of a CMOS phase/frequency detector (PFD), a CMOS pseudo-random code generator and an on-chip passive loop filter, which were designed for the multi-band PLL frequency synthesizer. The CMOS PFD provided phase tracking over a range of -2π to +2π radians. The …
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