First, from the view of noise and efficiency, various boost circuits are analyzed, concluded that the combination structure of charge pump and low dropout regulator is the best method to obtain a low ripple and high quantity voltage. 文章首先从噪声和效率这两个角度分析各种升压电路结构,分析结果表明电荷泵加上线性稳压电路的组合结构是获得低纹波高输出电压的最好方法。