基于LDO电压调整器的带隙基准电压源设计

设计一款应用于电压调整器（LDO）的带隙基准电压源。电压基准是模拟电路设计必不可缺少的一个单元模块,带隙基准电压源为LDO提供一个精确的参考电压,是LDO系统设计关键模块之一。本文设计的带隙基准电压源采用0.5μm标准的CMOS工艺实现。为了提高电压抑制性,采用了低压共源共栅的电流镜结构,并且在基准内部设计了一个运算放大器,合理的运放设计进一步提高了电源抑制性。基于Cadence的Spectre进行前仿真验证,结果表明该带隙基准电压源具有较低的变化率、较小的温漂系数和较高的电源抑制比,其对抗电源变化和温度变化特性较好。

Based on the LDO voltage regulator of design of band-gap voltage reference

Design of an applied voltage regulator(LDO) to the bandgap reference voltage source.Voltage reference is indispensable to a unit module to analog circuit design,Bandgap reference voltage source to provide a precise reference voltage for the LDO,It Is one of the key modules of the LDO system design.In this paper,the design of bandgap voltage reference with 0.5 μm standard CMOS technology.In order to improve the voltage suppressor,adopts a low-voltage cascode current mirror structure,and in the base internal design of an operational amplifier,a reasonable operational amplifier design further improve power s suppressor.Based on the Cadence Spectre simulation validation,The results show that the band gap reference voltage source has a low rate of change,small temperature drift coefficient and high power supply,its combat power change and temperature change characteristics of good.