设计了一种宽输入共模范围的比较器,用以处理高端电流检测中大共模信号的问题。通过采用预放大器和锁存器结构,优化了传输延时,提高了电路的分辨率及工作速度。基于0.5μm工艺,采用Cadence软件对电路进行仿真。结果表明,该电路可以处理轨到轨的共模输入电平,其最大可处理共模输入电平可跟随输入电压变化。当开关电源频率为1 MHz时,比较器电路的分辨率达到0.1 mV。 A wide input common-mode range comparator is designed to handle the problem of large common-mode signals in high-side current sensing. Through the use of preamplifier and latch structure, optimizing the transmission delay, improve the circuit resolution and speed. Based on the 0.5μm process, Cadence software is used to simulate the circuit. The results show that this circuit can handle rail-to-rail common-mode input levels and its maximum manageable common-mode input level can follow input voltage variations. When the switching power supply frequency is 1 MHz, the resolution of the comparator circuit reaches 0.1 mV.