Invention Grant
- Patent Title: Operational amplifier
- Patent Title (中): 运算放大器
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Application No.: US12872239Application Date: 2010-08-31
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Publication No.: US08193862B2Publication Date: 2012-06-05
- Inventor: Koichiro Adachi
- Applicant: Koichiro Adachi
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Cooper & Dunham LLP
- Priority: JP2009-210671 20090911
- Main IPC: H03F3/45
- IPC: H03F3/45

Abstract:
A multi-stage amplification type class-AB operational amplifier disclosed includes an amplification stage having plural amplification sections formed in multiple stages, and a class-AB output stage having a bias section and an output section, in which an input signal input to the amplification stage is sequentially amplified by the plural amplification sections, and further amplified by the bias section and the output section of the class-AB output stage. A positive supply voltage applied to the amplification stage is different from a positive supply voltage applied to the class-AB output stage, and a negative supply voltage applied to the amplification stage is different from a negative supply voltage applied to the class-AB output stage.
Public/Granted literature
- US20110063036A1 OPERATIONAL AMPLIFIER Public/Granted day:2011-03-17
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