Invention Grant
- Patent Title: Amplification circuit, optical module, and amplification method
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Application No.: US15366399Application Date: 2016-12-01
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Publication No.: US10171051B2Publication Date: 2019-01-01
- Inventor: Hideki Oku
- Applicant: FUJITSU LIMITED
- Applicant Address: JP Kawasaki
- Assignee: FUJITSU LIMITED
- Current Assignee: FUJITSU LIMITED
- Current Assignee Address: JP Kawasaki
- Agency: Fujitsu Patent Center
- Priority: JP2015-255425 20151225
- Main IPC: H03F3/45
- IPC: H03F3/45 ; H04B10/50 ; H04B10/61 ; H04B10/40

Abstract:
An amplification circuit coupled to another circuit by alternating current (AC) coupling includes: an amplifier that amplifies and outputs a signal input from the other circuit or amplifies an input signal and outputs the amplified input signal to the other circuit; a feedback circuit that positively feeds back the signal output from the amplifier to an input of the amplifier; and a low pass filter that attenuates a high frequency component of the signal positively fed back to the input of the amplifier by the feedback circuit, and in which a higher cut-off frequency is set such that a lower cut-off frequency in a combination of the amplification circuit and a high pass filter formed by the AC coupling is lower than a lower cut-off frequency in the high pass filter.
Public/Granted literature
- US20170187341A1 AMPLIFICATION CIRCUIT, OPTICAL MODULE, AND AMPLIFICATION METHOD Public/Granted day:2017-06-29
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