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:
Jan. 29, 2008
Filed:
Nov. 21, 2005
Mitsuru Kikuchi, Tokyo, JP;
Mitsuru Kikuchi, Tokyo, JP;
Asahi Kasei Microsystems Co., Ltd., Tokyo, JP;
Abstract
An amplifierto which transistorsandfunctioning as variable resistors are connected in parallel is used. A burst signal is received by a light receiving elementand the received signal is converted into an input current signal Iin. The input current signal Iin is converted in the amplifierinto an output voltage Vo. Determination is made in a determining circuitas to whether the output voltage Vo exceeds a current voltage Vwhich is a threshold. The result of determination is stored in a register circuit. Based on the result of determination outputted from the register circuit, a desired voltage is selected from among a number of voltages generated beforehand in a control voltage generating circuit. The selected voltage is used to generate a control voltage Vgor Vgto be applied to the transistorsand; and the generated control voltage Vgor Vgis inputted to the transistororof the amplifier