1. A method for using pulse width to encode or modulate a signal. The width of each pulse is a function of the amplitude of the signal.
2. A technique used to modulate the power delivered to a load.
In DC-DC switching regulators, the pulse width driving the main power switch (and hence, the duty cycle) is varied to maintain the desired output voltage. In DC motor-control applications, pulse width is used to vary motor speed.
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