一种低延时低功耗PWM比较器电路设计  

A low delay low power PWM comparator circuit design

作　　者：张涛[1] 邹百威 ZHANG Tao;ZOU Baiwei(School of Information Science and Engineering,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学信息科学与工程学院,湖北武汉430081

出　　处：《微电子学与计算机》2024年第3期112-117,共6页Microelectronics & Computer

摘　　要：设计了一种基于HHGrace 0.35μm BCD工艺的低延时低功耗电压型静态脉冲宽度调制(Pulse Width Modulation,PWM)比较器,主要应用于高频低功耗的开关电源系统。设计中包含动态尾电流源和改进型正反馈放大器,以改进传统跨导放大器(Operational Transconductance Amplifier,OTA)型比较器高延迟和高功耗等问题。仿真结果表明:在1.2~5.0 V供电电压范围内稳定工作,最大上升沿延时35 ns,最大下降沿延时41 ns,支持6 MHz开关频率的系统,比较精度8 mV,失调电压439μV,静态功耗仅为2.5μA(1.2 V供电)和4.4μA(5.0 V供电)。A low delay and low power voltage type static Pulse Width Modulation(PWM)comparator based on HHGrace 0.35μm BCD process is designed,which is mainly used in high frequency and low power switching power supply systems.The design includes a dynamic tail current source and an improved positive feedback amplifier to improve the high latency and power consumption of traditional Operational Transconductance Amplifier(OTA)comparators.The simulation results show that the system works stably in the supply voltage range of 1.2-5.0 V,the maximum rising edge delay is 35 ns,the maximum falling edge delay is 41 ns,the system supports the switching frequency of 6 MHz,the comparison accuracy is 8 mV,the offset voltage is 439μV,and the static power consumption is only 2.5μA(1.2 V)and 4.4μA(5.0 V).

关 键 词：静态PWM比较器 高频 低功耗 开关电源 

分 类 号：TN432[电子电信—微电子学与固体电子学]