Regulation and dynamic stability of low power supply for wearable biomedical electronic devices /
This dissertation presents an in depth analysis of low voltage rectifiers and proposes a novel design with improved performance in terms of reduced threshold voltage, low biasing voltage, high power and voltage conversion efficiencies. The design comes with integral properties of regulation and dyna...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
Kuala Lumpur:
Kulliyyah of Engineering, International Islamic University Malaysia,
2014
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| Subjects: | |
| Online Access: | Click here to view 1st 24 pages of the thesis. Members can view fulltext at the specified PCs in the library. |
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| Summary: | This dissertation presents an in depth analysis of low voltage rectifiers and proposes a novel design with improved performance in terms of reduced threshold voltage, low biasing voltage, high power and voltage conversion efficiencies. The design comes with integral properties of regulation and dynamic stability. It aims to produce a stable supply which would be adequate enough to power up low voltage implantable buried devices. Measures have been taken to reduce the effect of threshold voltage drops and leakage currents using optimum sized CMOS transistors and other components selected through repetitive simulations. The proposed low voltage rectifier is designed in 0.18μm CMOS technology, which is not only viable nowadays but highly cost effective for the modern electronics market. The circuit is designed using PSpice simulation tool and its features of dynamic stability and regulation have been analyzed under adverse conditions. These include simulated variations in load resistance, sizes of transistors (mainly widths) and also the reduction of leakage current. The startup voltage for circuit is 0.3V which is less than the contemporary design which starts its operation at 0.8V. The proposed design achieves high voltage and power transfer efficiencies of 97% and 93% respectively at 1V supply voltage. The leakage current for 1V input voltage is calculated to be equal to 48nA and the complete design consumes 50μW power when rated components are used. Variations of resistance from 100 Ω to 500 Ω are simulated to check the dynamic stability of circuit and the circuit promises a committed performance over a wide range of load variations. The design occupies significantly smaller area as compared to the contemporary reported researches. This work has applications for powering low voltage buried electronic devices or implants or devices in inaccessible locations. |
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| Physical Description: | xvii, 79 leaves : ill. ; 30cm. |
| Bibliography: | Includes bibliographical references (leaves 71-73). |