Invention Grant
- Patent Title: Operational amplifier, analog arithmetic circuit, and analog to digital converter
- Patent Title (中): 运算放大器，模拟运算电路和模数转换器
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Application No.: US13735056Application Date: 2013-01-07
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Publication No.: US08692616B2Publication Date: 2014-04-08
- Inventor: Kunihiko Gotoh
- Applicant: Fujitsu Limited
- Applicant Address: JP Kawasaki
- Assignee: Fujitsu Limited
- Current Assignee: Fujitsu Limited
- Current Assignee Address: JP Kawasaki
- Agency: Fujitsu Patent Center
- Priority: JP2012-080531 20120330
- Main IPC: H03F3/45
- IPC: H03F3/45
Abstract:
A folded cascode operational amplifier includes a constant current source to output a constant current; a differential input stage to output a part of the constant current as a differential current based on a voltage difference between voltages input to an inverting input terminal and a non-inverting input terminal, and connected to the constant current source; and an output stage to output a remaining current obtained by subtracting the differential current from the constant current as an output stage current, and connected parallel to the differential input stage facing the constant current source.
Public/Granted literature
- US20130257637A1 OPERATIONAL AMPLIFIER, ANALOG ARITHMETIC CIRCUIT, AND ANALOG TO DIGITAL CONVERTER Public/Granted day:2013-10-03
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