filter - how to get trapezoidal pwm signal -

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i generate pwm signal microcontroller kinetis, don't want digital signal i'm trying convert signal trapezoidal 1 t rise , t fall longer. i've found have set rc filter nmos wave others suggest no use of nmos required ? can 1 ?

what need achievable digital-to-analog conversion or pulse-width-modulation + rc filter. not every mcu has dac, pwm can realized sure.


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