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 22 for “"Voltage reference"”.
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A novel precision voltage reference using a micromechanical resonator
… describes the analysis and design of a precision voltage reference (PVR) based upon a micromechanical resonator. The precision voltage reference consists of two closed loop controllers and a nonlinear resonator. The oscillator loop maintains oscillations in the resonator. The phase locked loop is …
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A low-noise bandgap voltage reference employing dynamic element matching
Bandgap voltages references are widely used in IC design, but are sensitive to low-frequency noise and component mismatch. This thesis describes the design and testing of a new IC voltage reference that targets these issues through three dynamic element matching (DEM) subsystems. The first is a …
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A 0.45 V low power high PSRR subthreshold CMOS voltage reference
Voltage references are broadly used in analog and digital systems to generate a DC voltage independent of process, supply voltage and temperature (PVT) variations. Conventional band gap references (BGR) add the forward bias voltage across a PN junction with a voltage that is proportional to …
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Design and Assembly of High-Temperature Signal Conditioning System on LTCC with Silicon Carbide CMOS Circuits
… are - two-stage op amp topologies and voltage reference, which are designed and fabricated in a new SiC CMOS process. The SiC two-stage op amp with PFET differential input pair showed 48.9 dB of DC gain at 500oC. The voltage reference is the first in SiC CMOS technology to employ an op …
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A Reconfigurable Digital-to-Analog Converter with Supply Invariant Linearity
… an operational transconductance amplifier in a voltage-follower configuration. This topology is highly configurable to allow for optimization across process voltages, step sizes and low power operation. The specification of the DAC is (1) supply independence (2) low power operation (3) operation …
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A High Temperature Reference Voltage Generator with SiC Transistors
… demand. This thesis presents a high temperature reference voltage generator that can operate reliably up to 250 °C for a downhole communication system. The proposed reference voltage generator is designed and prototyped using 4H-SiC bipolar transistors. Silicon carbide (SiC) is a semiconductor …
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A PVT tolerant voltage-controlled oscillator for automotive applications
… circuit will oscillate. In this thesis, a voltage-controlled oscillator is designed for increased performance under various process, voltage and temperature (PVT) conditions. By applying a voltage reference block, the output frequency of 0.5MHz, 0.75MHz, 1MHz or 1.25MHz can be obtained. In …
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State estimation of unbalanced power systems
… unbalanced device configurations, and multiple voltage references. Development of the new model appeals to multiport network theory and graph theoretic principles. Model equations are employed directly to obtain least squares estimators in the phase-voltage reference frame. The concept of power …
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Compact modeling of neutron damage effects in a bipolar junction transistor
… of the neutron-effects BJT model in a voltage reference circuit provides critical information for circuit design in a neutron environment.
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Development of a Sensor Readout Integrated Circuit Towards a Contact Lens for Wireless Intraocular Pressure Monitoring
… linear regulator that powers a current-starved voltage-controlled oscillator (CSVCO) used for establishing a backscatter communication link. Additional circuitry is included to regulate power to and from the battery. An undervoltage lockout circuit protects the battery from deep discharge …
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Long Term Measurement of Bandgap Voltage and System Level Integral Non-Linearity Drift
All modern precision measurement systems require voltage references that are stable across all variables, namely temperature and time. Most of these references are made through bandgap voltage circuits. While it is impossible to eliminate long term drift in these circuits it is industry standard to …
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High Performance Digital Control Techniques for Powering Microprocessors
… in which processors closely interact with voltage regulators are becoming necessary to enhance system energy efficiency. Digital techniques offer advantages such as flexibility, fewer external components and reduced overall cost as compared to conventional analog techniques. The primary …
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Fuzzy Model Reference Learning Control for Smart Lights
… across the experimental testbed to a desired voltage reference value, and to test the performance of the fuzzy controllers under cross-illumination effects, and bulb and sensor failures. As an initial approach, a decentralized (i.e., no communication between controllers) nonadaptive fuzzy …
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The electrical characteristics of the direct current welding arc and the design and testing of a D.C. welding generator
… produce high welding currents when using a low voltage reference supply from a battery. The initial evaluation has to be repeated on a new design of alternator and tests indicate that a suitable A.C. reactor in the output from the alternator will produce a more desirable transient response to …
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Ultra-low noise and low temperature drift power supply system design for RF applications
… order temperature coefficient in traditional voltage reference is effectively compensated by generating positive second order temperature coefficient using MOS transistor current. The simplicity of the scheme contributes to power efficiency and low noise. This topology is simulated in 65nm …
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Single stage boost inverter for standalone fuel cell applications
… system is required to convert the de voltage output of the PEMFC to ac voltage. Therefore, the focus of this thesis is to analyse, simulate and design a power electronic dc-ac converter. The power electronic dc-ac converter is based on a transformerless single stage power conversion …
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Photovoltaic Source Simulators for Solar Power Conditioning Systems: Design Optimization, Modeling, and Control
… with actual PV generator, and (iv) precise reference generation technique. Throughout this research, two different PV source simulator systems are designed, modeled, and experimentally verified. The design of the first system focuses mainly on creating new reference generation techniques …
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Control Strategies for Minimizing the DC-Link Capacitance in Power Electronics Converters for Aircraft Electrical Power Systems
… rectifier is investigated in which the DC-link voltage regulation is obtained through the excitation control of the exciter SG using a two-quadrant DC chopper. A steady-state feedforward duty ratio and output power-based feedforward exciter field current reference are proposed to improve the …
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Modulation and control strategies for multilevel five-phase open-end winding drives
… designs, due to their limitations to block high voltage (several kilovolts) and conduct high current (several hundreds of amperes per-phase). For this reason and numerous other advantages, solutions based on multilevel inverters and multiphase machines are considered in recent years. The open-end …
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