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. 13, 2010
Filed:
Jun. 24, 2008
Hitoshi Ikeda, Tokyo, JP;
Hitoshi Ikeda, Tokyo, JP;
Oki Semiconductor Co., Ltd., Tokyo, JP;
Abstract
A preamplifier includes a single-ended amplifier, a differential amplifier, an operational amplifier, and a clipping circuit. The single-ended amplifier converts an input current signal into a voltage signal, outputs an amplified voltage signal according to a preset amplification gain. The differential amplifier includes first and second differential inputs, and outputs a negative-phase signal and a positive-phase signal. The amplified voltage signal is applied to the first differential input of the differential amplifier. The operational amplifier includes first and second inputs which respectively receive the negative-phase signal and the positive-phase signal, where an output of the operational amplifier is applied to the second differential input of the differential amplifier. The clipping circuit clips an amplitude of the negative-phase signal output by the differential amplifier.