| 一款用于LED驱动芯片的CMOS振荡器 |
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| 引用本文： | 陈国安,夏晓娟.一款用于LED驱动芯片的CMOS振荡器[J].电子器件,2007,30(3):890-893. |
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| 作者姓名： | 陈国安 夏晓娟 |
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| 作者单位： | 东南大学国家专用集成电路系统工程技术研究中心,南京,210096 |
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| 摘 要： | 研究一款适用于LED驱动芯片的CMOS振荡器电路.其工作原理是在环路振荡器中加入恒定电流源,以恒定电流对电容充电、MOS管对电容快速放电以产生锯齿波再经锁存器产生周期脉冲信号.与传统的环路振荡器相比,此电路的优点是振荡频率精确、波形稳定,振荡频率在一定的电源电压范围内对电源电压变化不敏感.此振荡器电路已经成功应用于一款LED驱动芯片中.
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| 关 键 词： | 环路振荡器 周期脉冲信号 锯齿波 电源抑制比 |
| 文章编号： | 1005-9490（2007）03-0890-04 |
| 修稿时间： | 2006-06-16 |
CMOS Oscillator Used in Monolithic LED Driver |
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| CHEN Guo-an,XIA Xiao-juan.CMOS Oscillator Used in Monolithic LED Driver[J].Journal of Electron Devices,2007,30(3):890-893. |
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| Authors: | CHEN Guo-an XIA Xiao-juan |
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| Affiliation: | National ASIC System Engineering Center, Southeast University, Nanjing 210096, China |
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| Abstract: | A CMOS oscillator used in monolithic LED driver is presented. The oscillator based on ring oscillator. The saw tooth waveform was formed by a capacitor charging with a designed constant current source and didchanging though a MOSFET. A periodic pulse was generated by passing the saw toochwave through a latch. Compared to the traditional ring oscillator, the frequency of this oscillator is stable, precise, power-supply-insensitive in a range of power supply. This oscillator had been used in a LED driver IC successfully. |
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| Keywords: | ring oscillator periodic pulse saw tooth power-supply rejection ratio |
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