Due to the varying phase difference between the two inputs, a pulse-width modulated (PWM) signal is produced. When a low-pass filter is applied to those pulses, the filter's output rises as the pulses grow longer and its output falls as the pulses grow shorter.
Due to the differing phase difference between the two inputs, a pulse-width modulated (PWM) signal is generated. When a low-pass filter is applied to those pulses, the filter's output increases as the pulses become longer and decreases as the pulses shorten.