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 39 for “"Charge-pump"”.
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An integer-N charge-pump phase-locked loop with controllable phase offset
… controlling the phase-offset at the output of a charge-pump PLL (CPLL) by setting the current mismatch in the charge-pump module.
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A regulated, charge-pump CMOS DC/DC converter for low-power applications
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Design and analysis of a 1.28ghz charge pump phase-locked loop in 180nm technology node
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Design of a Radial Mode Piezoelectric Transformer for a Charge Pump Electronic Ballast with High Power Factor and Zero Voltage Switching
In a conventional electronic ballast for a fluorescent lamp, inductor-capacitor-transformer tank circuit is used. A Piezoelectric Transformer (PT) can potentially be used to replace such a tank circuit to save space and cost. In the past, ballast design using a PT requires selecting a PT from …
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Analysis, Design, and Evaluation of Hierarchical Switched-Capacitor Cell Voltage Balancers
… voltage balancer topology that employs canonical charge pump inverters as fundamental building blocks. The charge pump inverter implementation was first designed using a fully N-channel switch configuration and a mixed N- and P-channel switch configuration. This was tested at the 2S, 4S, 8S, and …
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An improved electronic ballast for the fluorescent lamps
The ''charge pump" electronic ballast circuit, which employs a charging capacitor and a high frequency ac source to implement the power factor correction (PFC), has become an attractive topology for ballasting the fluorescent lamps because it eliminates the use of a bulky boost inductor. But the …
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Current Shuttling Cell Voltage Balancers: Design, Evaluation, and Simulation
… of batteries and to extending their lifespan. Charge pump balancers can quickly and efficiently shuttle charge across battery cells to equalize voltages. Component selection of MOSFETs and capacitors is vital in optimizing for performance, cost, and volume. This thesis presents experimental and …
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A power supply circuit for gate driver of flying capacitor multi-level converters
… new techniques termed cascaded bootstrap, double charge pump and gate-driven charge pump. A new power supply circuit combining the three techniques altogether is developed and used to deliver the required gate voltage using internally available voltage nodes. The proposed circuit can help shrink …
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Advanced High-Frequency Electronic Ballasting Techniques for Gas Discharge Lamps
… of high-frequency electronic ballasts for gas discharge lamps. However, power line quality and electromagnetic interference (EMI) issues arise when a simple peak rectifying circuit is used. To suppress harmonic currents and improve power factor, input-current-shaping (ICS) or …
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Vibration-to-electric energy conversion using a mechanically-varied capacitor
… harvesting. The circuit combines a diode-based charge pump with an asynchronous inductive flyback mechanism to re- turn the pumped energy to a central reservoir. A cantilever beam variable capacitor with 650 pF DC capacitance and 347.77 pF zero-to-peak AC capacitance, formed by a 43.56 cm2 …
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Operation and analysis of high-voltage-gain dc-dc converters with voltage multipliers
… in this research is based on a modified Dickson charge pump voltage multiplier stage, and this family has been studied in discontinuous conduction mode (DCM). The second family relies on a non-inverting or inverting diode-capacitors voltage multiplier stage and has been proposed in both …
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Design and analysis of an ASIC for energy harvesting applications
… energy to electric energy. A 6 stage AC/DC charge pump designed by a previous student was redesigned to multiply the output voltage of the piezoelectric generators. A Low Dropout Regulator (LDO) was designed to create a steady dc output voltage of 4.1 V. The ASIC for this system was designed …
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A low phase noise ring oscillator phase-locked loop for wireless applications
… with integrated logic. A fully differential charge pump with switched-capacitor common mode feedback is utilized in conjunction with a nonlinear phase-frequency detector for accelerated acquisition time.
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Low jitter phase-locked loop clock synthesis with wide locking range
… new circuit architectures are employed for the charge pump circuit and phase-frequency detector (PFD) to minimize the timing jitter due to the finite dead zone in the PFD and the current mismatch in the charge pump circuit. The selection of the optimum PLL loop bandwidth is critical in …
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Multi-source energy harvesting for lightweight applications
… auxiliary RF harvester uses a fully-integrated charge pump to impedance-match to a rectenna with greater than 94% matching. The parasitic models developed for the RF harvester show errors less than 1.4% in the measured system.
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Low phase noise, high bandwidth frequency synthesis techniques
… to the point where intrinsic noise sources (VCO, charge-pump, reference and PFD noise) ultimately limit noise performance. An analytical model that draws an analogy between fractional-N frequency synthesizers and MASH A digital-to-analog converters is proposed. Calculated performance of a …
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Analysis of soft charging switched capacitor power converters
… can support soft-charging, and the Dickson charge pump is selected for the continued development of soft-charging control. The specifics of adapting soft-charging to the Dickson topology are accomplished through a loop-by-loop analysis to modify the phase structure and charge vector analysis …
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Design of a clock and data recovery circuit in 65 nm technology
… described. A CDR consists of a phase detector, a charge pump, a loop filter and a voltage-controlled oscillator. This thesis includes an overview of all the building blocks of a PLL-based CDR, derivation of the mathematical formulations of the negative feedback loop, and a report on closed loop …
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Transport in nanoscale systems
In part I of the Thesis charge ordering and transport in arrays of coated semiconductor nanocrystals (quantum dot arrays) are studied. Charge ordering in dot arrays is considered by mapping the electrons on the dots onto the frustrated spin model on the triangular lattice. A number of phases is …
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