摘要
从DC-DC芯片电路的实际设计需求出发,设计了一款输入电压范围在2.5~15 V的带隙基准电路。通过预调节电路的设计,带隙基准核输出的基准电压转化为一个稳定的电流源,形成的负反馈结构给带隙基准核自身提供供电电压,提高了电源电压范围上限;通过电压选择电路,在电源电压低于5 V时使带隙基准核直接由电源电压供电,拓宽了电源电压范围的下限。同时,预调节电路和带隙基准核中共源共栅结构为电路带来了良好的电源抑制特性。设计基于0.25μm BCD工艺,完成了原理图、版图设计以及仿真,结果表明设计在-55℃~125℃的温度范围内,可以输出稳定的0.8 V电压,温度系数为7.78 ppm/℃;低频条件下PSR达到159 dB,线性调整率为0.0012%。
Based on the actual design requirements of DC-DC chip circuit,this paper designs a bandgap reference circuit with an input voltage range of 2.5~15 V.Through the design of the pre-regulator circuit,the reference voltage output by the bandgap reference core is transformed into a stable current source,and the negative feedback structure is formed to provide a power supply voltage for the bandgap reference core itself,thus increasing the upper limit of the power supply voltage range.Through the voltage selection circuit,the bandgap reference core is directly powered by the power supply voltage when the power supply voltage is lower than 5 V,which broadens the lower limit of the power supply voltage range.At the same time,the pre-regulator circuit and the cascode structure in the bandgap reference core brings good power supply rejection performance to this circuit.This design is based on 0.25μm BCD process,and the schematic diagram,layout design and simulation of the circuit are completed.The results show that this design can output a stable voltage of 0.8 V in the temperature range of-55℃~125℃,and the temperature coefficient is 7.78 ppm/℃.At low frequency,the PSR reaches 159 dB,and the line sensitivity is 0.0012%.
作者
李思源
李亚军
张有涛
钱峰
Li Siyuan;Li Yajun;Zhang Youtao;Qian Feng(Nanjing Electronic Devices Institute,Nanjing 210016,China;Nanjing Guobo Electronics Co.,Ltd.,Nanjing 211111,China)
出处
《电子技术应用》
2024年第4期38-43,共6页
Application of Electronic Technique
