Sanyo Electric Co., Ltd.

Ryouichi Ando

Tetsuya Tokunaga

Hiroyuki Arai

Takeshi Kimura

Mamoru Yamaguchi

A frequency adjustment circuit that maintains a target frequency even when frequency adjustment data of zapping circuit is changed by an external noise is offered. The frequency adjustment circuit includes a reset signal generation circuit, a frequency adjustment data latch circuit that latches and retains the frequency adjustment data ZPand ZPgenerated by a first zapping circuit and a second zapping circuit based on a latch clock ZCLK and a latch clock generation circuit that generates the latch clock ZCLK. The reset signal generation circuit generates a periodic reset signal ZRES that is synchronized with a rise of an enable signal EN generated from an interface circuit. The latch clock generation circuit generates the latch clock ZCLK that is synchronized with a fall of the enable signal EN.

Growing community of inventors

Saitama-ken, Japan

Ryouichi Ando