摘要
bandgap是模拟电路当中的基本单元,其性能对整体电路起着关键的作用。一阶温度补偿的bandgap电压基准源其温度系数一般大于10ppm/℃,无法应用于一些高精度的系统当中。传统的Banba结构的二阶温度补偿只能对高温度段的温度系数进行调整,而低温度段的温度系数会恶化,因此难以得到极低的温度系数。提出了一种新型的分段线性补偿bandgap电压基准源电路。该电路能够在原有一阶补偿电路的基础上,对bandgap的输出电压进行分段线性曲率补偿。最终采用sm ic0.35μm工艺仿真后,bandgap输出电压的温度系数小于2ppm/℃。
Bandgap is one of the basic units in the analog IC design system and encapsulate many of the key issues in lots of ASIC system.Basic bandgap having no temperature-compensation structure has a higher temperature coefficient（TC） usually larger than 10ppm/℃.Traditional Banba＇s bandgap will improve the TC in the high temperature with degrading the TC in the low temperature.As a result,the TC of the total temperature will not be improved significantly.This paper introduces a new piece-linear bandgap compensation structure.With this kind of structure,the curvature of the bandgap can be compensated.Therefore,the output of the bandgap can be regulated piece-linearly.Through simulation,by using smic 0.35μm technology,the TC of the bandgap output voltage is less than 2ppm/℃.
出处
《微处理机》
2011年第2期52-55,共4页
Microprocessors
关键词
带隙基准
曲率补偿
温度系数
Bandgap
Curvature compensation
Temperature coefficient
