Browsing by Subject "Charge pump"
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Item Analysis and design of 3 stage voltage rectifier multiplier and 2 stage multi-phase voltage doubler for and energy harvesting system(2012-08) Shrivastava, Ravindranath; Gale, Richard O.; Li, ChangzhiThe reliability and the efficiency of the wireless link between the TX/RX for wireless sensors devices depends on the environmental conditions such as change in the physical distance or changes in the orientation between transmitter and receiver. So the need arises to monitor and the ability to adjust the wireless link between TX/RX without interrupting the operation of the wireless sensor. Also the ambient wireless energy can also be harvested to power the wireless sensor circuitry. We propose an N-Stage Voltage Multiplier/Rectifier built in AMI06 process using a Schottky diode to convert the ambient RF Energy into DC voltage which can be measured to evaluate the strength of the Wireless link. The proposed system can be used to monitoring and vary the wireless link parameters such as the resonant matching condition between TX/RX antenna coil and physical alignment without interrupting the operation of the wireless sensor. Also the DC energy harvested can be boosted further by our proposed multiphase charge pump to a higher DC Level which can be used by the wireless sensor circuitry. The DC power harvested can also be used alongside the on board battery which will lead to increase in battery efficiency. The voltage multiplier/rectifier and charge pump involving the power stage and the feedback circuitry can be built on the same die as the wireless sensor circuitry which can lead to less bulky system.Item Design of charge pump phase locked loop(2012-08) Mishra, Satyabh; Li, Changzhi; Gale, Richard O.Phase Locked Loop system is around since 1932. The versatility of PLL systems and where it can apply makes it very useful. It can be applied to automobiles as well as cellular chips. This thesis work presents design and analysis of a Phase Locked Loop in IC level. It is implemented and designed in a 0.5um CMOS process. All the blocks of the Phase Locked Loop was designed independently and then integrated together. Phase Frequency Detector, Charge Pump, Low Pass Filter, VCO, Frequency Divider and Level Shifter topologies and circuits are described in detail along with some major design tradeoffs and critical issues. The uses and implementation of two kind of frequency divider is demonstrated. Their design tradeoffs are utilized to make design effective and robustItem Fully integrated CMOS charge pump design(2010-08) Anumula, Sarat Reddy; Hassibi, Arjang; McDermott, MarkDue to the continuous power supply reduction, Charge Pumps, also referred to as DC-DC converters, circuits are widely used in integrated circuits (ICs) to generate high voltages for many applications, such as EEP-ROMs, Flash memories for programming and erasing of the floating gate, switched capacitor circuits, operational amplifiers, voltage regulators, LCD drivers, piezoelectricactuators, etc. A charge pump is a kind of DC to DC converter that uses capacitors as energy storage elements to create either a higher or lower voltage power source. The development of the charge pumps is motivated by ever increasing the needs for the small form factor (i.e small size and low weight), high-conversion-efficiency and low costpower management system, which is the best candidate suitable to meet the needs of continuosly shrinking portable electronic devices like MP3 players, cellular phones, PDA's.Item New architecture development for energy harvesting(2011-08) Reddy, Divya; Bayne, Stephen B.This research presents the design of an ultra-low power energy scavenging system capable of collecting and managing energy from ambient vibrations and RF electromagnetic waves. The main motive is to develop a self-powered system which is a substitute for remotely placed low power batteries with rare human interaction. Firstly, the energy transducers, commercial piezoelectric generators with a wide frequency range of 26 – 205Hz and the antenna with a center frequency of 916MHz are evaluated and characterized to maximize the efficiency. Both antenna and piezoelectric generator can form an array of each type to increase the energy being harvested. Secondly, the power electronic circuits involved in the energy harvesting are designed in 0.6um CMOS technology and the simulation results are presented. Charge pumps and rectifier were optimized to operate with low voltage ranges since the energy produced by the piezoelectric generator and the whip antenna is found to be in microwatts and less from the test results. The AC output from the piezoelectric generator is rectified and boosted to required output level using an AC-DC charge pump. A rectifier and DC-DC charge pump are adopted for the efficient conversion of voltage from the antenna. A back-up battery will be provided for the start-up of DC-DC charge pump at low input conditions. An LDO is designed to provide regulated output of 4.1 V to the battery. Finally, the collected energy will be stored in a 50uAh capacity thin film battery which is intended for low-voltage and low-power applications.