高精度电流求和型分段曲率补偿的基准电流源

摘要

基于电流求和原理和跨导线性结构,设计了一款分段曲率补偿的基准电流源,并对电阻进行了温度特性优化.所设计的电路无需运算放大器,具有功耗低、结构简单、精度高和电源抑制比高等优点.在0.4 μm BCD-工艺下,经HSPICE 仿真验证表明,在-40℃～125℃的温度范围内电流仅变化0.06μA,温度系数为27ppm/℃；在25℃、7～20V范围内,基准电流变化率0.000 68％/V;在12 V工作电压下,电路的静态电流为128.09 μA.该电路可用于高电压,低功耗、高精度的系统设计中.%A novel current reference circuit based on current summing mode and TransLinear structure is proposed in this paper. To enhance the performance, the resistors are also optimized. With curvature compensated, the circuit is of high precision. The circuit is simply designed without operational amplifier. A pre-regulator is also included to improve PSRR. HSPICE simulation with 0.40 μm BCD process shows the temperature coefficient is 27 ppm/ ℃ in the range -40 ℃~125 ℃, the line regulation achieves 0.000 68%/V [7~20 V] at 25 ℃, and 12 V supply voltage, the quiescent current is 128.09 uA. As described above, the circuit is very suitable for the system of high voltage, low power consumption and high precision.