The circuit start's in the buttom op-am and it finsh in the left top op-am... The fisrt op-am it's an integer that makes a triangule wave, then a sumator helps to low the offset of the triangule wave 8 volts down. Then a comparator between the triangule wave and a sinuidal wave creates the SPWM. The frecuency of the triangule wave has to be higher than the siniudal wave.
**Note: The resistor ganancy of the sumator start's in 10kOhms and then we can increase to 200kOhm to generate the SPWM**
