queston in unipolar spwm for 3-level d.c.i

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hi all..
attached my unipolar spwm on 3-level diode clamped inverter with 50 hz sinusoidal and amplitude of 1. while triangular frequency 2khz and 0.5 u for pulse width and Tr=Tf=0.24975m and Td=0 and v1=-1 and v2=1.

the output voltage waveform on a pure resistive load attached and i think the red circles are not ok in the output ..why?...is it related to my mosfet or opamps or what???,...i need an advise...thanks

 

i have sent it to ur email titled "humbly a question" and hope to get ur kind reply..thanks...i didnt know how to attach the image last time..sry...

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It looks like something is wrong with the timing of the drive signals.

Keith.
 

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