Patents by Inventor Kenzou Tan

Kenzou Tan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • AUTOMATIC IDENTIFICATION LEVEL CONTROL CIRCUIT, IDENTIFICATION LEVEL CONTROL METHOD, AUTOMATIC IDENTIFICATION PHASE CONTROL CIRCUIT, IDENTIFICATION PHASE CONTROL METHOD, OPTICAL RECEIVER, AND OPTICAL COMMUNICATION SYSTEM
    Patent number: 6420962
    Abstract: The present invention provides an automatic identification level control circuit, an identification level control method, an automatic identification phase control circuit, an identification phase control method, and an optical receiver, capable of stably setting an optimal identification level or identification phase. An automatic identification level control circuit of the present invention includes a coupling capacitor, an identification circuit, a level fluctuation detection circuit, an identification voltage control circuit, and a low-pass filter. The identification circuit includes limiter amplifiers and flip flops. The level fluctuation detection circuit includes exclusive OR circuits.
    Type: Grant
    Filed: December 15, 2000
    Date of Patent: July 16, 2002
    Assignee: NEC Corporation
    Inventors: Yoshihiro Matsumoto, Takashi Kuriyama, Yoshinori Honma, Tsutomu Tajima, Masashi Tachigori, Toshibumi Kawano, Hirokazu Kobayashi, Masaki Shiraiwa, Kenzou Tan