Operational amplifier, analog arithmetic circuit, and analog to digital converter
AssigneeFujitsu Limited
InventorKunihiko GOTOH
Life of this patent
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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.
Claims8
A folded cascode operational amplifier comprising:
- a constant current source configured to output constant current;
- a differential input stage connected to the constant current source, the differential input stage being configured to output apart of the constant current output from the constant current source as a differential current based on a voltage difference between a voltage input to an inverting input terminal and a voltage input to a non-inverting input terminal;
- and
- an output stage connected parallel to the differential input stage with respect to the constant current source, the output stage being configured to output a remaining current as an output stage current, the remaining current being obtained by subtracting the differential current from the constant current output from the constant current source.
Dependencies are inferred from the claim text.