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difficulty in generating unipolar SPWM wave using f28335.

 I am generating two SPWM signals using HRPWM module of F28335 delfino.
(1)first by sine wave.
(2)second by complementary sine wave.
I want to do subtraction of this two pwm wave and want that output using PWM engine only.
I tried thinking many things, but havn't got solution.
P.s. Need solution to get unipolar SPWM output using PWM engine in f28335 delfino.