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针对集成电路中需要多路不同基准电流的问题,设计了一种高性能的双极型基准电流源.分析了传统带隙基准源的基本原理,并对传统电流源的电路结构进行改进与优化,实现了温度补偿,大大降低了电路的温度系数,提高了电路的电源抑制比.在BL双极工艺模型下,采用HSPICE软件进行了仿真,结果表明,在-40~85℃温度范围内基准电流源的温度系数降至百万分之五每摄氏度,电源抑制比可以达到104 dB,很好地实现了基准电流源低温度系数、高电源抑制比的性能.
Aiming at the problem that multiple reference currents need to be multiplexed in integrated circuits, a high performance bipolar reference current source is designed. The basic principle of traditional bandgap reference source is analyzed and the circuit structure of traditional current source is improved and optimized , The temperature compensation is achieved, the temperature coefficient of the circuit is greatly reduced, and the power supply rejection ratio of the circuit is improved.With the BL bipolar process model, the simulation is carried out by using HSPICE software and the results show that in the temperature range of -40 ~ 85 ℃, When the temperature coefficient of the current source is reduced to five parts per million degrees Celsius, the power supply rejection ratio can reach 104 dB, which well realizes the low temperature coefficient of the reference current source and the high power supply rejection ratio.