| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a triangular wave generation circuit that is less affected by variations in a supply voltage and has small variations in the center level of triangular wave signals when the supply voltage varies. <P>SOLUTION: The triangular wave generation circuit comprises: a capacitor; a constant current source 11 for charging by supplying a constant current to the capacitor; a constant current source 14 for discharging the charged electrical charge of the capacitor; a switch 12 connected between the constant current source 11 and the capacitor; and a switch 13 connected between the constant current source 14 and the capacitor. The triangular wave generation circuit outputs the terminal voltage of the capacitor as a triangular wave signal by turning on/of the switches 12, 13 alternately at a constant period. The triangular wave generation circuit has a reference voltage generation circuit that is connected to the output end of the triangular wave signal and supplies a reference voltage where the influence of variations of the supply voltage that becomes the center voltage of the triangular wave is small. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
