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US 8,149,054 B2Granted
Operational amplifier
AssigneeRenesas Electronics Corporation
InventorMasaki Shibuya
Life of this patent
Estimating the term…
Abstract
An operational amplifier includes a differential amplifier input stage that supplies an operating current to a differential pair, the differential amplifier input stage including a first transistor having a first polarity, a push-pull amplifier output stage that includes a second transistor having the first polarity, and a third transistor having a second polarity, the second transistor and the third transistor being connected in series, and a capacitive element that connects a gate of the first transistor and a gate of the second transistor.
Claims3
An operational amplifier comprising:
- a differential amplifier input stage that supplies an operating current to a differential pair, the differential amplifier input stage comprising a first transistor having a first polarity;
- a push-pull amplifier output stage that comprises:
- a second transistor having the first polarity;
- and
- a third transistor having a second polarity, the second transistor and the third transistor being connected in series;
- a capacitive element that connects the gate of the first transistor and a gate of the second transistor,
- wherein the differential pair is formed by P channel MOS transistors,
- wherein the first transistor and the second transistor are formed by P channel MOS transistors,
- wherein the third transistor is formed by an N channel MOS transistor ,and
- wherein a negative potential is supplied from the gate of the second transistor to the gate of the first transistor when an output signal from the differential amplifier input stage is raised.
7 more elements
An operational amplifier comprising:
- a differential amplifier input stage that supplies an operating current to a differential pair, the differential amplifier input stage comprising a first transistor having a first polarity;
- a push-pull amplifier output stage that comprises:
- a second transistor having the first polarity;
- and
- a third transistor having a second polarity, the second transistor and the third transistor being connected in series;
- a capacitive element that connects the gate of the first transistor and a gate of the second transistor,
- wherein the differential pair is formed by N channel MOS transistors,
- wherein the first transistor and the second transistor are formed by N channel MOS transistors,
- wherein the third transistor is formed by a P channel MOS transistor, and
- wherein a positive potential is supplied from the gate of the second transistor to the gate of the first transistor when an output signal from the differential amplifier input stage is fallen.
7 more elements
Dependencies are inferred from the claim text.