Based on the SPWM signal generating circuit of Direct Digital Synthesizer

The utility model provides a kind of SPWM signal generating circuit based on Direct Digital Synthesizer, which employs the sine wave signal in Direct Digital Synthesizer generation SPWM circuit, in conjunction with the bipolar SPWM signal of the triangular signal use Natural Sampling acquisition that frequency divider and integrating circuit produce, the distortion of the sine wave signal that its inversion is reduced is minimum, and by the feature of Direct Digital Synthesizer, the generation overcoming SPWM signal in prior art adopts the deficiency of pure analog circuit scheme and the shortcoming of pure software programming scheme, also remain pure analog circuit scheme and pure software programming scheme advantage separately in prior art simultaneously, the SPWM signal exported is made to meet waveform distortion low, the accuracy of signal frequency and amplitude is high, the adjustable extent of signal frequency is large, stability is good, the technical requirements such as frequency resolution is little, the effective development helping promotion SPWM application technology performance.