Working analysis of push-pull output

The capacitor C connected directly to A and B becomes Figure 1-230. The newly connected capacitor C is called a bootstrap capacitor. The voltage
at point A can be increased by using a bootstrap capacitor .     In the static state, Vi-oV, midpoint voltage VD=V+/2, point B voltage VB= VD= V+/2, point A voltage 山= v+-VR , bootstrap capacitor c is charged between A and B, Charging voltage V∞=VA - VB=v bucket. 1 VR —V+/2= v+/2 -VR. Since VR is very small, it can be ignored. When C is very large, even if an AC signal voltage passes through , the charging voltage V +/2 will not change.