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PWM generation using digital output

I have NI PXIe-6363 and PXIe-6535 cards. I want to generate PWM signals to drive a 3-ph inverter using digital output pins(not counters). The PWM should be generated by comparison of a sine wave(50 Hz) with a sawtooth carrier wave( around 20 kHz). Is it possible to generate the above PWM signals using digital pins on the mentioned cards? If there is any sample vi or example or technique to do so, please share. 

 

Thanks in Advance

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