Here is a video of a PWM signals generated using a microcontroller. The two signals are in quadrature phase - i.e. their phase difference is 1/4 of their period (or you can say they are 90 degrees apart). The signals were generated using an ATmega32. Program was written in Assembly Language. AVRStudio4 and STK500 were used as development tools.
The Hows and Whys of Electronics
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