一种智能化漏电保护芯片的设计

Design of a Smart Leakage Current Protector IC

提出了一种智能化漏电保护芯片。电路基于0.6μm CMOS工艺、采用数模混合信号设计,并用全定制的方法实现。与现有模拟漏电保护芯片相比,该芯片具有较高的智能化:对输入信号是否有效进行辨识,以排除干扰,减少误动作;采用数字延时代替现有的RC延时方式,大大提高了控制精度及三级匹配;三级保护的不同应用环境的可编程性;实现智能化开关控制;具有报警功能,保障安全。由于芯片的大部分功能由数字电路实现,大大降低了功耗。通过采用全定制的方法,优化电路和版图设计,减少了芯片面积,降低了成本。

A smart leakage-current protector IC is presented, which is implemented in a mixed-signal 0. 6μm CMOS process and using full-custom design approach. This circuit features smartness in leakage current protection. The input signal is checked for validity to keep the chip from malfunction. Fixed digital delay time is used to improve the accuracy of the protection control, and it is programmable to suit different three-level protection applications. The switch is smartly controlled, and the chip has the function of alarming. The use of digital circuit reduces its power dissipation, and the full-custom approach saves chip area and reduces cost as well .