class D 的积分器环路为什么增益普遍设置为2？

To obtain desirable Power ,
if the second stage gain <2 , then the output swing of first stage is too hign.
if the second stage gain >3, Maybe the feedback resistor is too large ,and so does thedistortion .
Just my opionion.

Thus , 2 or 3 ,all just OK.

if the second stage gain >3, Maybe the feedback resistor is too large ,and so does thedistortion .

请问为何反馈电阻大，distortion也大?

feedback resistor Rfb>> Rout2 output resistorofthe second gain stage ,so if Rout2 increase Rfb must be much larger