I am getting Sine wave, saw tooth and square wave at the output. But the problem is that when i increase the frequency, output voltage (across capacitor) decreases in case of sine and saw tooth wave due to decrease in reactance of capacitor.
Not very clever, because you need a tunable low-pass filter then.So, PWM frequency is varying between 3200Hz and 320KHz.
what i am doing here, constant sampling rate.but variable PWM frequency (which i think is necessary as well in industry standard signal generators ).
You probably need a simple high frequency anti-aliasing filter at its input and another simple high frequency filter at its output to attenuate the low level clock leakage signal.
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