Through in-depth analysis of the causes of ripple, find out that the main factor affecting the ripple is the input offset voltage of error amplifier circuit in the prior to circuit. And by theoretical calculation the optimal value of the input offset voltage is obtained. 通过深入分析纹波产生的原因,指出影响纹波的主要因素是前向电路中误差放大电路的输入失调电压,并通过理论计算获得了输入失调电压的最优值。