The present invention discloses a staged linear conversion method, which comprises steps: receiving a staged linear triangular-wave signal and a reference signal with a comparator, wherein the staged linear triangular-wave signal has a waveform having at least three different slopes; and performing a conversion on the reference signal to output a PWM signal according to the voltages of the intersections of the staged linear triangular-wave signal and the reference signal and the slope variation of the staged linear triangular-wave signal. The present invention can reduce the distortion of saturation signals when a Class D amplifier performs signal conversion.
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