# Forum: µC & Digital Electronics STM32-MAT/TARGET

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Hi, I am trying to generate sine modulated PWM on STM32F401-Disco board
using MATLAB. The desired freq of a sine wave is 50Hz and of the carrier
wave is 20kHz. But I am not getting 50Hz freq. Please suggest a
solution.

I need sine modulated PWM during +ve half cycle of a sine wave and zero
output during -ve cycle of a sine wave. Desired samples of sine are 200.
I have attached the MATLAB simulation circuit snapshot. Problem is that
I am getting 5Hz freq.

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