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Embedded Digital Filters for PWM Generators

Thanks to their intrinsic high efficiency audio power switching amplifier are becoming wide spread in many applications where heating and costs are major concerns. Several topologies exist to reduce augmented distortion, and many of them rely on digital signal processors (DSPs). Nowadays the market offers several products with integrated peripherals for analog signal sampling and PWM generation. However the latter operation is still a time consuming task, often performed with a number of different approaches. The paper presents a method for an efficient computation of the PWM signal corresponding to the input audio signal, suitable to feed a switching output power stage. The presented method exploits DSP capabilities and it is oriented to DSPs that integrate PWM generators. Its peculiar characteristics is the possibility to perform N taps FIR operation on the audio signal together with the computation of a suitable PWM signal with N MAC operations per sample.

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