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设计并实现了一种基于双极型工艺的2.5 V高精度大负载电流集成基准电压源电路,通过对传统带隙基准电路的改进,设计中增加了电源电压分配电路、电流反馈电路和大电流驱动电路,实现高精度大负载电流的目标。通过Cadence软件平台下的Spectre仿真器对电路的温度系数、负载调整率、噪声、交流电源纹波抑制比、负载电流、启动时间等电参数进行仿真验证,得到了初始精度±0.5%,在-40～85℃范围内温度系数小于6×10-6/℃,负载电流0～50 mA,电源电压4.5～36 V,输出为2.5 V的集成电压基准源电路。该电路采用6μm/36 V双极型工艺生产制造,芯片面积为1.7 mm×2.1 mm,具有过热保护、过流保护和反接保护功能。
A 2.5 V high precision and large load current integrated voltage reference circuit based on bipolar technology is designed and implemented. By improving the traditional band gap reference circuit, the power voltage distribution circuit, current feedback circuit and high current Drive circuit, to achieve high-precision large load current goal. Simulation results show that the initial accuracy of the circuit is ± 0.5% with the Specter simulator on the Cadence software platform, the temperature coefficient, load regulation, noise, AC ripple rejection ratio, load current and start-up time of the circuit are simulated. An integrated voltage reference circuit with a temperature coefficient of less than 6 × 10-6 / ° C, a load current of 0 to 50 mA, a supply voltage of 4.5 to 36 V and an output of 2.5 V over a temperature range of 40 to 85 ° C. The circuit is manufactured in a 6μm / 36 V bipolar process and has a chip area of 1.7 mm × 2.1 mm with overheat protection, overcurrent protection and reverse polarity protection.