| 摘要 |
PURPOSE:To prevent the generation of sencondary distortion, by performing the conversion to a pulse width signal based on the sampled digital signals and the complement of the said digital signals, and performing analog conversion through a filter. CONSTITUTION:A pulse width signal forming circuit 1 generates a pulse width signal in which a digiral signal of required bits is taken as the center of pulse width for a prescribed time of the sampling period and the value is changed depending on each data. A pulse width signal forming circuit 2 converts a complemented digital signal into the pulse width signal. A mixer circuit 4 inverts one of two pulse width signals and adds it to the other. As a result, the obtained pulse width signal is converted into an analog signal through a smoothing filter 5. Thus, the secondary harmonics are cancelled and the generation of distortion can be generated. |
