摘要
采用SMIC 40 nm CMOS工艺,设计了一款多路低输出电压的带隙基准源。运用斩波调制和滤波器,有效地消除了运算放大器的失调电压带来的影响,并采用微调技术,提高了带隙基准源的精度。使用Cadence Spectre工具对其进行仿真,结果表明,在输出电压为400 mV的同时可以得到250 mV、200 mV、150 mV、115 mV、100 mV、75 mV和50 mV 7个输出基准电压;常温下的低频电源抑制比达到了76.3 dB,带隙基准的供电电压范围为1.2~3.6 V,当电源电压为2.5 V、斩波频率为2 MHz时,输出电压在温度为-40~125℃范围内的温度系数为10.45 ppm,当给运算放大器加入±2%的误差时,斩波调制使输出电压的相对精度提高了88倍,微调技术使其提高了5倍。
Using SMIC 40 nm CMOS technology,a bandgap source with multi⁃channel low output voltage is designed.Using chopper modulation and filter,the influence of maladjusted voltage of operational amplifier is eliminated,and the precision of bandgap source is improved by using trimming technology.The Cadence Spectre tool was used to simulate it,the results showed seven output reference voltages:250 mV,200 mV,150 mV,115 mV,100 mV,75 mV and 50 mV could be obtained while the output voltage was 400 mV.Under the normal temperature of the low frequency power supply rejection ratio is 76.3 dB,the bandgap voltage range of 1.2~3.6 V,when the power supply voltage of 2.5 V,chopping frequency of 2 MHz,the output voltage for-40~125℃in temperature range of temperature coefficient is 10.45 ppm,When an error of±2%is added to the operational amplifier,chopper improves the relative accuracy of the output voltage by 88 times and trimming improves it by 5 times.
作者
赵婵君
赵宏亮
赵建中
ZHAO Chanjun;ZHAO Hongliang;ZHAO Jianzhong(School of Physics,Liaoning University,Shenyang 110031,China;IntelliSense Center,Institute of Microelectronics,Chinese Academy of Sciences,Beijing 100029,China)
出处
《电子设计工程》
2022年第12期22-26,共5页
Electronic Design Engineering
基金
国家重大科技专项(2016ZX02301)。
关键词
斩波调制
滤波器
失调电压
微调技术
斩波频率
chopper modulation
filter
offset voltage
trimming technology
chopper frequency
