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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.
The PWM deals with timing instead of voltage so any common-mode voltage shift across the isolation barrier does not affect the signal. The PWM signal will be very robust to noise since it is either a 0 or a 1 instead of a small analog voltage. A class-D amplifier is a very inexpensive way to convert analog to PWM.