The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 16, 2002
Filed:
Dec. 15, 2000
Yoshihiro Matsumoto, Tokyo, JP;
Takashi Kuriyama, Tokyo, JP;
Yoshinori Honma, Tokyo, JP;
Tsutomu Tajima, Tokyo, JP;
Masashi Tachigori, Tokyo, JP;
Toshibumi Kawano, Tokyo, JP;
Hirokazu Kobayashi, Miyagi, JP;
Masaki Shiraiwa, Miyagi, JP;
Kenzou Tan, Tokyo, JP;
NEC Corporation, Tokyo, JP;
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.