class D 的积分器环路为什么增益普遍设置为2？

shuipihu

class D 的积分器环路为什么增益普遍设置为2？

lvbenqiang123

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 the  distortion .
Just my opionion.

lvbenqiang123

Thus , 2 or 3 ,all just OK.

kuohsi

回复 2# lvbenqiang123
if the second stage gain >3, Maybe the feedback resistor is too large ,and so does the  distortion .   


请问为何反馈电阻大，distortion也大？

jiang_shuguo

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