Title page for etd-0706109-135451


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URN etd-0706109-135451
Author Shao-Fu Yen
Author's Email Address No Public.
Statistics This thesis had been viewed 5377 times. Download 24 times.
Department Electrical Engineering
Year 2008
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title A Charger Circuit of Li-ion Batteries and a Capacitor-less LDO for Wireless Biomedical Systems
Date of Defense 2009-06-18
Page Count 68
Keyword
  • regulator
  • capacitor-less
  • Li-ion
  • ldo
  • biomedical
  • Abstract The thesis is composed of two topics : a charger circuit of Li-ion batteries for wireless biomedical systems and a capacitor-less low dropout regulator(LDO).
    The first topic discloses a charger circuit of Li-ion batteries using 2P4M 0.35-μm CMOS process, which comprises a small bias circuit, a comparator with hysteresis, a transistor voltage divider circuit, a power MOS, and a Li-ion charger with a cut-off voltage and a recharge voltage. The proposed design receives a 13.56 MHz carrier with 5±0.2 V amplitude to charge the Li-ion batteries with a small constant current.
    The second topic reveals a low dropout regulator (LDO) without capacitor load and ESR, including a bias circuit, an error amplifier, and a Flipped Voltage Follower circuit generating a stable output voltage independent on different loads. The proposed design improves the input voltage limitation of Flipped Voltage Follower by compensating phase margin such that the proposed design shows a good transient response and stability without any output capacitor. The proposed LDO is implemented by 1P6M 0.18-um CMOS process, which can operate correctly given an input voltage range from 3.3~4.2 V.
    Advisory Committee
  • Sying-Jyan Wang - chair
  • Shen-Fu Hsiao - co-chair
  • Jih-Ching Chiu - co-chair
  • Chua-Chin Wang - advisor
  • Files
  • etd-0706109-135451.pdf
  • indicate in-campus access in a year and off_campus not accessible
    Date of Submission 2009-07-06

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