The .000001% of use cases for a simple passive VGA to HDMI is for when the video source is designed especially to output both VGA and HDMI. In these cases the cable will accompany the video source when you buy it. This is so rare, I almost regret writing this much about it. Analog vs Digital.
Definition - What does Pulse Width Modulation (PWM) mean? Pulse-width modulation (PWM) is a modulation process or technique used in most communication systems for encoding the amplitude of a signal right into a pulse width or duration of another signal, usually a carrier signal, for transmission.
PWM employs a train of pulses. All pulses are flat-topped and have the same amplitude. The. pulse repetition rate (that is, the number of pulses per second) is constant. Information is. conveyed by the width of the pulses. When an analog signal is sampled, each sample value can. be encoded in the width of a pulse. The pulse repetition rate is then equal to the sampling rate. Most PWM systems are designed so that the width of an individual pulse is related to the. corresponding sample value by. (1) where and are constants.