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:
Oct. 05, 2010
Filed:
Aug. 29, 2005
Kazuko Nishimura, Kyoto, JP;
Hiroshi Kimura, Hyogo, JP;
Kazuko Nishimura, Kyoto, JP;
Hiroshi Kimura, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A receiving circuit comprises a transimpedance amplifierincluding an inversion amplifierfor amplifying an input current IN, and a feedback resistance Rconnected between an input and an output of the inversion amplifier, a comparison circuitfor comparing an output OUT of the transimpedance amplifierwith a certain desired reference value, and outputting a result of the comparison, and a control circuit for holding the comparison result, and generating an AGC signalfor adjusting a gain of the transimpedance amplifier. The transimpedance amplifierhas a function capable of gain adjustment in accordance with the input AGC signal. The control circuitperforms gain adjustment until the output OUT of the transimpedance amplifierexceeds the reference value so that an appropriate gain is obtained. Therefore, even when an input has a wide dynamic range, it is possible to prevent signal saturation and a distortion in output waveform in the transimpedance amplifier, so that appropriate reception can be invariably performed and a signal having a stable duty can be output.