公开(公告)号：US20190165798A1

公开(公告)日：2019-05-30

申请号：US16264992

申请日：2019-02-01

Applicant: DENSO CORPORATION

Inventor： Kazuhiro NAGAI ,  Takuya HARADA

IPC: H03L7/099 ,  H03K3/03

CPC classification number: H03K3/0315 ,  H03K3/013 ,  H03K5/156 ,  H03L7/0995

Abstract: A ring oscillator is configured with a multiple number of logic inverting circuits in a ring shape and generates multi-phase clock signals. A period measuring unit measures a period of a reference clock inputted thereto by the multi-phase clock signals of the ring oscillator and outputs a measured period as a period data value. A frequency spreading calculation unit calculates a frequency spreading command value in accordance with a frequency spreading rate, a frequency spreading period and the period data value of the period measuring unit, which are inputted. A pulse generation unit generates a clock pulse corresponding to the frequency spreading command value in accordance with a data value determined by addition of the frequency spreading command value to the period data value.