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Control analogue output from CPLD with PWM

Posted: 08 Apr 2009     Print Version  Bookmark and Share

Keywords:pulse-width modulator  digital-to-analogue converter  PWM 

A pulse-width modulator (PWM) is a common way of generating analogue outputs from a digital component. A PWM replaces a digital-to-analogue converter that generates analogue voltage or current proportional to the digital input. As the name implies, a PWM generates a series of constant voltage or current digital pulses with pulse widths or duty cycles that are proportional to the intended analogue strength. The series of modulated pulses can be converted to an analogue voltage with a low-pass filter, but this is usually not necessary.

This article shows a typical analogue signal and its corresponding digital PWM representation. In general, an analogue signal has maximum amplitude, minimum amplitude, and many levels in between. In contrast, the PWM only has two levels: maximum and minimum.

View the PDF document for more information.





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