基于PTAT改进的带隙基准源电路的设计与仿真

摘要

2.5V of high precision voltage reference on digital voltmeter, power systems and the role of operational amplifiers have an important. Under the premise of the analysis and comparison of various voltage reference performance, finally chose based on PTAT （and proportional to absolute temperature） improved bandgap circuit as a basis for designing. Using power voltage distribution circuits in wide supply range of voltage reference internal energy output of high precision voltage reference, increased output driver circuit guaranteed voltage reference source with large load capacity, optimized startup circuit, temperature protection circuit, over-current and overvoltage protection circuits, ensure that the circuit is stable and reliable work.%高精度的2．5V基准电压对数字电压表、电源系统以及运算放大器有着重要的作用。在分析比较各种基准电压源性能的前提下，最终选择了以基于PTAT（与绝对温度成正比）改进的带隙基准源电路作为设计的基础。采用了电源电压分配电路实现基准电压源的在较宽的电源范围内能输出高精度的基准电压，增加了输出驱动级电路保证电压基准源有大的负载能力，优化了启动电路、温度保护电路、过流和过压保护电路，保证该电路稳定可靠的工作。