斩波调制的1.25V CMOS带隙基准电压源

1.25V Chopped CMOS Bandgap Voltage Reference Source

带隙基准电压源广泛应用在模拟集成电路中,为集成电路芯片系统提供稳定的直流参考电压,是电路设计中不可或缺的一个单元模块。设计了1.25V CMOS带隙基准电压源电路,采用斩波调制技术改进了电路结构,以提高输出基准电压的精度。基于CSMC 0.5μm CMOS工艺,使用Cadence工具对未采用斩波调制的电路和采用斩波调制的电路的输出电压分别在typical工艺角下进行仿真。仿真结果显示,采用斩波调制后,输出基准电压由1.05V变化到1.21V,误差由16%减小到了3.28%。

As one of the most important unit or module, bandgap voltage reference source is widely used in analog integrated circuits, in order to provide stable DC reference for the integrated circuits （IC） chip systems. A 1.25V CMOS bandgap voltage reference source is designed and the schematic diagram is restructured by adding chopper structure to improve the accuracy of output reference voltage. In this paper, based on CSMC’s 0.5μm CMOS process, the output voltages of the circuit without chopped structure and the chopped circuit is respectively simulated under typical process corner with Cadence tools. The simulation results show that output voltage of circuit changes from 1.06V to 1.21V by adding chopped structure;the error of output accuracy is decreased from16%to 3.28%.