To obtain an oscillation circuit for generating triangular waves having different frequencies, phases or amplitude widths synchronously with a standard triangular wave in generating a plurality of the triangular waves.

When voltages VC1 at both ends of a capacitor C1 reach a voltage VH of a power supply 16, a comparator 13 sets set terminals S of a flip-flop 15. When the voltages VC1 at both the ends of the capacitor C1 are lowered to a voltage VL of a power supply 17, a comparator 14 sets reset terminals R of the flip-flop 15. An output Q of the flip-flop 15 which has been set or reset by the comparators turns a switch SW1 on/off to charge or discharge the capacitor C1 to generate the standard triangular wave, and turns a switch SW2 on/off using an output QB to switch a capacitor C2 to a charging operation or a discharging operation.

COPYRIGHT: (C)2008,JPO&INPIT