Operational amplifier
AssigneeSanechips Technology Co., Ltd.
InventorYiqiang Wu
Life of this patent
Estimating the term…
Abstract
Disclosed is an operational amplifier, including a first-stage gain circuit, a second-stage gain circuit, and a tail current compensation circuit. The first-stage gain circuit is connected to the second-stage gain circuit, the first-stage gain circuit is provided with an input terminal, the second-stage gain circuit is provided with an output terminal. The first-stage gain circuit at least includes a tail current source, a first terminal of the tail current compensation circuit is connected to the tail current source, and a second terminal of the tail current compensation circuit is connected to the output terminal of the second-stage gain circuit. The tail current compensation circuit is configured to compensate the tail current source with an output signal of the output terminal of the second-stage gain circuit.
Claims9
An operational amplifier, comprising a first-stage gain circuit, a second-stage gain circuit, a tail current compensation circuit and a positive feedback tuning circuit, wherein
- the first-stage gain circuit is connected to the second-stage gain circuit and provided with an input terminal, the second-stage gain circuit is provided with an output terminal;
- the first-stage gain circuit at least comprises a tail current source, a first terminal of the tail current compensation circuit is connected to the tail current source, and a second terminal of the tail current compensation circuit is connected to the output terminal of the second-stage gain circuit;
- the tail current compensation circuit is configured to compensate the tail current source with an output signal of the output terminal of the second-stage gain circuit, and
- a first terminal of the positive feedback tuning circuit is connected to the first-stage gain circuit, a second terminal of the positive feedback tuning circuit is connected to ground, and the positive feedback tuning circuit is configured to reject a positive feedback signal introduced by the tail current compensation circuit.
Dependencies are inferred from the claim text.