基于电平检测的上电复位电路  

Power on Reset Circuit Based on Voltage-Detected

作　　者：高鹏[1] 蔡世俊 常昌远[2] 

机构地区：[1]南京恩格蓝波微电子有限公司,南京210001 [2]东南大学集成电路学院,南京210096

出　　处：《电子器件》2006年第4期1107-1109,共3页Chinese Journal of Electron Devices

摘　　要：目前基于延时的上电复位电路,其延时电容在掉电后,所储存的电量影响了下一次上电的延时,容易出现复位电平太窄甚至无法产生复位电平的问题;并且电源电位的上升速度,也会影响到复位电路的可靠性;针对此类问题,提出一种基于电平检测的上电复位电路,利用电源回路中本身具有的RC延迟时间作脉冲宽度,可以达到较长的复位时间;并且本电路的复位电平与工艺参数相关,能保证实际电路在复位电平消失后的可靠工作;探讨了本电路的复位特征及可靠性,并从流片结果得到验证。通过理论上的分析和实际结果的测量,本复位电路具有良好的可控性和优秀的复位能力;而且还具有较小的芯片面积。在某些情况下,还可以替代欠压检测电路。Power on reset circuit is based on RC time-delay model, which is not stable in some special conditions because slow rising voltage of supply power and charge stored in capacitor debase the performance of the power on reset. This paper describes a kind of power on reset circuit based on voltage-detected. Wider reset time can be reached though the RC delay of the power supply and the transferring voltage of the reset circuit closely connect to the IC process, so IC can work correctly after the reset pulse disappeared. Characteristics are also analyzed. Testing results show that it is more stable than normal reset circuit model, and small chip size can be gotten. In some case, it can instead of power failure circuit.

关 键 词：上电复位 复位脉冲宽度 电平检测 

分 类 号：TP274.4[自动化与计算机技术—检测技术与自动化装置]