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Introduction to Pulse Width Modulation. A look at a powerful technique for controlling analog circuits with a microprocessor's digital outputs. Pulse width modulation (PWM) is a powerful technique for controlling analog circuits with a microprocessor's digital outputs. PWM is employed in a wide variety of applications, ranging from measurement and communications to power control and conversion.
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.