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-£gm 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¡Ó0.2 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.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0706109-135451 |
| Date | 06 July 2009 |
| Creators | Yen, Shao-Fu |
| Contributors | Chua-Chin Wang, Sying-Jyan Wang, Jih-Ching Chiu, Shen-Fu Hsiao |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0706109-135451 |
| Rights | campus_withheld, Copyright information available at source archive |
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