| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a pulse signal generator in which a duty ratio of pulse output is controlled easily to a predetermined value. <P>SOLUTION: The pulse signal generator comprises: a waveform shaping circuit WFS capable of converting an AC signal ASG into a pulse signal and performing pulse width modulation by a control signal; a low-pass filter circuit LPF receiving a pulse output PSG from the waveform shaping circuit WFS and outputting its average voltage; a reference voltage circuit RVS for outputting a preset reference voltage; and a voltage comparison circuit CMP for comparing the average voltage with the reference voltage. Duty control of the pulse output is made by employing the output from the voltage comparison circuit CMP as the control signal of the waveform shaping circuit WFS. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
