Fujitsu Corporation

Masao Iijima

Teruhiko Saitou

Kouji Okada

Shinji Miyata

Yukisato Miyazaki

Koji Okada

A spread spectrum clock generation circuit capable of further reducing the electromagnetic wave radiation with a simple configuration has been disclosed and, particularly in a spread spectrum clock generation circuit using a current control oscillator (ICO), a differential signal to which a spread spectrum modulation signal, the period or amplitude of which changes, is added is generated, and the differential signal is applied to the ICO and a clock is generated.

Spread spectrum clock generation circuit, jitter generation circuit and semiconductor device

A method of decoding a digital signal includes processing the digital using a delay operation in accordance with a frequency characteristic of 1&plus;D, where D is an output signal of the delay element. The processed digital signal is then converted to a three level conversion signal (0, positive, negative). The conversion signal is then processed in accordance with a frequency of 1/(1&plus;D) to generate a decoded signal. The conversion signal is also checked to determine if there is a conversion error. If a conversion error is detected, propagation of the error is restricted, such that a correct decoded signal is provided.

Growing community of inventors

Kasugai, Japan

Masao Iijima