基于抖频和斜坡补偿的抗EMI振荡器设计  

Design of anti EMI high oscillator based on dithering and slope compensation

作　　者：杨明吉 刘云涛[1,2] 方硕 王云 YANG Mingji;LIU Yuntao;FANG Shuo;WANG Yun(College of Information and Communication Engineering,Harbin Engineering University,Harbin 150001,China;Key Laboratory of Advanced Marine Communication and Information Technology,Ministry of Industry and Information Technology,Harbin Engineering University,Harbin 150001,China;Guangdong Greater Area Institute of Integrated Circuit and System,Guangzhou 510535,China)

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001 [2]先进船舶通信与信息技术工业和信息化部重点实验室,黑龙江哈尔滨150001 [3]广东省大湾区集成电路与系统应用研究院,广东广州510535

出　　处：《微电子学与计算机》2024年第2期76-83,共8页Microelectronics & Computer

基　　金：国家自然科学基金重大仪器研制项目(62027814);广东省平台项目(2019B090909006,2019B090904015)。

摘　　要：设计了一种应用于开关电源转换器中的抗电磁干扰(Electro-Magnetic Interference,EMI)振荡器,其主要创新在于在开关电源系统中加入了频率抖动且可产生斜坡补偿的时钟信号。产生斜率可调整的三角波电流信号,并将频率抖动模块集成在振荡器内部。该振荡器提高了开关电源稳定性,而且引入了数字辅助的修调技术,对充电电容进行双向调整,消除了工艺带来的误差。该振荡器基于0.18μm BCD(Bipolar CMOS DMOS)工艺,实现了振荡器频率线性切换,振荡器的正常工作频率为1 MHz,最小工作频率为100 kHz,其抖动范围在基础频率的−1.66%~+4.3%,在2.7~5.5 V电源电压范围以及−40~125℃温度范围内,输出频率变化2.45 kHz,变化率为0.245%,占空比偏移0.653 ns,补偿电流峰值偏移0.125 nA,修调范围60.98%。An anti-Electro-Magnetic Interference(EMI)oscillator used in switching power supply converter is designed.Its main innovation is that it is convenient to add frequency jitter and can generate ramp compensation clock signal in switching power supply system.The triangular wave current signal with adjustable slope is generated,and the frequency jitter module is integrated in the oscillator.The oscillator improves the stability of the switching power supply,and introduces the digitally-assisted tuning technology to adjust the charging capacitance in both directions,eliminating the error caused by the process.The oscillator based on 0.18μm BCD(Bipolar CMOS DMOS)process realizes the linear switching of oscillator frequency.The normal operating frequency of the oscillator is 1 MHz,the minimum operating frequency is 100 kHz,and its jitter range is−1.66%-+4.3%of the base frequency.In the range of 2.7-5.5 V power supply voltage and−40-125℃temperature,the output frequency changes 2.45 kHz,the change rate is 0.245%,the duty cycle shift is 0.653 ns,the compensation current peak shift is 0.125 nA,and the adjustment range is 60.98%.

关 键 词：振荡器 斜坡补偿 频率抖动 电磁干扰 数字辅助修调 

分 类 号：TN431.1[电子电信—微电子学与固体电子学]