Why not PWM?

A project log for Delta-Sigma versus PWM

Delta-Sigma: solution for a virtually unlimited number of DACs, and with faster refresh rates than PWM. Applicable on any microcontroller.

rogeorgeRoGeorge 06/18/2015 at 18:490 Comments

Because in PWM, for each PWM period, there is only one big pulse, wider or thinner according with the duty cycle.

On the countrary, in Delta-Sigma there are many thinner pulses corresponding to the same PWM period, and spatially spread over the whole period. The bigger the duty cycle, the bigger the number of the thinner pulses per each period.

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