OSCILLATION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide an oscillation circuit that can efficiently generate a polyphase triangle wave signal. SOLUTION: A switch SW 1 is switched ON/OFF on the basis of a 1st switching signal SQ 1 generated by a 1st charge/discharge changeover circuit 21 and a 1st triangle wave signal Vct1 is generated at a node N1. A 2nd charge/ discharge changeover circuit 22 detects a level of the node N1 to generate a 2nd switching signal SQ 2. A switch SW 2 is switched ON/OFF on the basis of the 2nd switching signal SQ 2 and a 2nd triangle wave signal Vct2 delaying the phase of the 1st triangle wave signal Vct1 by a 1/3 period is generated at a node N2. A 3rd charge/discharge changeover circuit 23 detects the level of the node N1 to generate a 3rd switching signal SQ 3. A switch SW 3 is switched ON/OFF on the basis of the 3rd switching signal SQ 3 and a 3rd triangle wave signal Vct3 resulting from delaying the phase of the 2nd triangle wave signal Vct3 by a 1/3 period furthermore is generated at a node N3.