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標題: | 應用無電容式低壓降穩壓器之電流脈衝型雷射二極體驅動器 Current-Pulse Driver Using a Capacitor-Free Low Dropout Regulator for Laser Diode |
作者: | Chang-Ying Yu 游長穎 |
指導教授: | 陳秋麟(Chern-Lin Chen) |
關鍵字: | 低壓降線性穩壓器,無電容式,分離式功率元件,電流脈衝型驅動器,雷射二極體, low dropout regulator,capacitor-free,spilt-structured pass element,current-pulse driver,laser diode, |
出版年 : | 2009 |
學位: | 碩士 |
摘要: | 低壓降線性穩壓器(LDO)已被廣泛地應用於一些電池供電的可攜式電子產品中,像是手機、數位相機、PDA等等。相較於切換式電源供應器,LDO有較快的暫態響應、低雜訊、體積小、成本低以及只需要少量的外部元件等特性。
穩定度一直是在設計低壓降線性穩壓器過程中很重要的一個議題。在傳統頻率補償方式中,為了使LDO系統穩定,需要一個外部負載電容,且此負載電容寄生的等效串聯電阻(ESR)阻值需要位於一特定的隧道範圍中,其阻值不好控制。 論文中利用了一個LDO利用分離式結構的功率元件所達到極點-零點對補償方式,此LDO對負載電容無特殊限制。換句話說,在穩定度中,不再需要去考慮外部負載電容值以及其等效串聯電阻值。此LDO的輸出電壓為3.3V,輸出最大電流為300mA,在滿載300mA下最小輸入電壓為3.5V,所使用的為0.5-μm 1P3M CMOS製程。 而且,應用低壓降穩壓器之電流脈衝型雷射二極體驅動器也在此被提出。一個對負載電容無特殊限制的LDO提供一個穩定電流,加上兩個外部功率電晶體相互切換所產生一個極短暫的電流脈衝。一個225mA/20ns的電流脈衝型雷射二極體驅動器因此被製造出,所使用的為0.5-μm 1P3M CMOS製程。 Low dropout regulator (LDO) has been generally applied for several battery-powered portable electronic applications, such as cellular phone, digital camera, PDA, and so on. Compared with a switch-mode power supply, an LDO features has faster transient response, lower noises, less volume, less cost and only need a few off-chip devices. Stability is always an important issue while designing an LDO. In conventional compensation scheme, in order to guarantee system stability of LDO, it required an off-chip capacitor and its parasitic equivalent series resistance (ESR) values must fall into a specific tunnel-like region. The ESR is normally not well controlled. In this thesis, an LDO with spilt-structured pass element using the pole-zero pairs compensation is proposed. It achieves a capacitor-free LDO. Namely, the load capacitor and the ESR of the load capacitor are no longer required for stability consideration. The proposed LDO is 3.3V/300mA and a minimum dropout voltage of 0.2V for 300mA of output current, using a 0.5-μm 1P3M CMOS technology. Furthermore, a current-pulse driver for laser diodes using the capacitor-free LDO regulator structure is proposed. The capacitor-free LDO regulator, which provides a constant current, and two off-chip switching power MOSFETs to generate pulse current through the laser diode. A 225mA/20ns current-pulse driver has been fabricated using a 0.5-μm 1P3M CMOS technology. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/43205 |
全文授權: | 有償授權 |
顯示於系所單位: | 電機工程學系 |
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ntu-98-1.pdf 目前未授權公開取用 | 3.48 MB | Adobe PDF |
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