Operational amplifier

An operational amplifier and transistor technology, applied in amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as changes in gain and bandwidth, affecting the stability of circuit operation, and failure of circuits to work normally, to improve gain and stability. Gain bootstrap function, increase the effect of working stability

Active Publication Date: 2017-09-05
SOUTH CHINA UNIV OF TECH
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  • Claims
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Problems solved by technology

[0003]The new oxide thin film transistor device has become a popular research object in recent years because of its excellent performance and simple manufacturing process, but the oxide thin film transistor is an N-type device. There are two problems: 1. Lack of complementary P-type devices, resulting in low gain of the operational amplifier composed of N-type tubes
2. It has the characteristics of threshold voltage drift, which affects the stability of the circuit
If compensation measures are not taken or a feedback module is used, the operation of the operational amplifier circuit will be unstable due to the threshold voltage drift of the oxide thin film transistor, such as changes in gain and bandwidth, and even the circuit will not work properly

Method used

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Embodiment

[0031] like figure 1 and figure 2 As shown, an operational amplifier includes an input stage circuit, a bias circuit and an output stage circuit.

[0032] The input stage circuit includes a differential input module, a first gain bootstrap module and a second gain bootstrap module. The gain bootstrap module improves the gain of the entire operational amplifier through positive feedback; the bias circuit includes a bias module and a common-mode feedback module. The bias module provides two bias voltages for the differential input module; the common-mode feedback module provides a bias voltage for the differential input module, and has a common-mode feedback function, and the feedback signal eliminates the offset voltage by controlling the tail current source of the differential input module ; The output stage circuit includes a differential-to-single-ended module. The differential-to-single-ended module inverts and superimposes the two differential signals output by the inp...

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Abstract

The invention discloses an operational amplifier. The operational amplifier comprises an input-stage circuit, a bias circuit and an output-stage circuit; the input-stage circuit comprises a differential input module, a first gain bootstrapping module and a second gain bootstrapping module; the bias circuit comprises a bias module and a common-mode feedback module; the output-stage circuit comprises a differential-to-single-ended module; the common-mode feedback module provides a bias voltage for the differential input module, and has the common-mode feedback function; the feedback signal controls the tail current source of the differential input module to eliminate the offset voltage; and the differential-to-single-ended module overlaps two differential signals output by the input-stage circuit in a phase reversal way, and then output with a single port. The gain of the operational amplifier disclosed by the invention can be effectively improved.

Description

technical field [0001] The invention relates to a semiconductor integrated circuit, in particular to an operational amplifier. Background technique [0002] Operational amplifiers find widespread use in many analog circuits. In many applications, the operational amplifier is required to have a high magnification, and the commonly used structures are the operational amplifier with two-stage amplification and the operational amplifier with gain bootstrap technology. [0003] The new oxide thin film transistor device has become a popular research object in recent years because of its excellent performance and simple manufacturing process, but the oxide thin film transistor is an N-type device, and there are two problems: 1. The lack of complementary P-type devices, resulting in The operational amplifier composed of N-type tubes has low gain. Therefore, two gain bootstrap blocks are used to increase the gain. 2. It has the characteristic of threshold voltage drift, which affe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/30H03F3/45H03G3/30
CPCH03F1/301H03F3/45179H03F3/45479H03G3/30H03F2200/447
Inventor 吴为敬吴建东宁洪龙徐苗王磊彭俊彪
Owner SOUTH CHINA UNIV OF TECH
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