摘要
基于传统的Brokaw结构带隙基准源进行改进,采用无运放的Brokaw结构基准源,避免运算放大器带来的输入失调电压的影响,提高基准电压精度。针对不同工艺角下基准温度特性曲线零温度系数点变化导致温度系数变差的问题,设计了一种分段线性温度补偿与电阻修调结合的补偿修调方案,对基准输出进行温度补偿的同时修调电压精度。相比于传统分段线性补偿法,该方案避免了在其他工艺角下分段补偿时出现的补偿不足或补偿过度的情况,实现了基准电压源输出在器件全工艺角组合下的低温度系数和高精度。电路基于TSMC 0.18μm BCD工艺设计。仿真结果表明,该电路在5 V电源电压下输出电压为1.201 V,输出失调电压为3.3 mV。在全工艺角下,-40℃~+125℃温度范围内,基准电压温度系数最大为7.48×10^(-6)/℃,输出电压为1.201(1±0.16%)V。
The traditional Brokaw structure bandgap reference source was improved,and the Brokaw structure reference source without operational amplifier was adopted,which avoided the influence of input offset voltage brought by the operational amplifier,and improve the accuracy of the reference voltage.Aiming at the problem of deterioration of the temperature coefficient caused by the zero temperature coefficient point change of the reference temperature characteristic curve under different process corners,a compensation and adjustment scheme combining piecewise linear temperature compensation and resistance trimming was designed to perform temperature compensation and voltage trimming on the reference output at the same time.Compared with the traditional piecewise linear compensation method,this scheme avoided under-compensation or over-compensation in other process corners,and realized the low temperature coefficient and high accuracy of reference voltage source output under full process corners of the device.The circuit was designed in TSMC 0.18μm BCD process.The simulation results show that the output voltage of the circuit is 1.201 V under the power supply voltage of 5 V,and the output offset voltage is 3.3 mV.Under the full process corners,within the temperature range of-40℃to+125℃,the maximum temperature coefficient of the reference voltage is 7.48×10^(-6)/℃,and the output voltage is 1.201(1±0.16%)V.
作者
陈浩
邓红辉
林昌海
舒孟杨
何超越
CHEN Hao;DENG Honghui;LIN Changhai;SHU Mengyang;HE Chaoyue(Institute of VLSI Design,Hefei University of Technology,Hefei 230601,P.R.China)
出处
《微电子学》
CAS
北大核心
2023年第6期1037-1045,共9页
Microelectronics
基金
国家重点研发计划(2018YFB2202604)
安徽省重点研究与开发计划项目(202104g01020008)
关键词
高精度基准
温度补偿
低失调电压
high precision reference
temperature compensation
low offset voltage
