Two-stage operational amplifier

An operational amplifier and operational amplification technology, applied in the direction of amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as noise (large flicker noise, overall performance limitations of amplifiers, etc.), achieve high gain, ensure stability, and increase gain Effect

Active Publication Date: 2016-10-12
BOE TECH GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the existing two-stage operational amplifier can provide high gain, its own noise (flicker n

Method used

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  • Two-stage operational amplifier
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Embodiment Construction

[0078] In order for those skilled in the art to better understand the technical solution of the present invention, a two-stage operational amplifier provided by the present invention will be described in detail below with reference to the accompanying drawings.

[0079] figure 1 A schematic structural diagram of a two-stage operational amplifier provided for an embodiment of the present invention, such as figure 1 As shown, the two-stage operational amplifier includes: a bias voltage generation unit 1 , a first-stage operational amplification unit and a second-stage operational amplification unit.

[0080] Wherein, the bias voltage generating unit 1 is connected to the first-stage operational amplifier unit 2 and the second-stage operational amplifier unit 4, and is used to provide corresponding bias to the first-stage operational amplifier unit 2 and the second-stage operational amplifier unit 4. Voltage.

[0081] The first-stage operational amplification unit 2 is connecte...

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Abstract

The invention discloses a two-stage operational amplifier, comprising a bias voltage generation unit, a first-stage operational amplifier unit and a second-stage operational amplifier unit. The first-stage operational amplifier unit comprises a foldable cascode amplifier circuit and a cross coupling load. The cross coupling load is connected with a load differential pair in the foldable cascode amplifier circuit. The cross coupling load comprises two transistors. The two transistors in the cross coupling load and the two transistors in the corresponding load differential pair form two current mirror structures. The two current mirror structures are crossly coupled. According to the technical scheme of the amplifier, through addition of the cross coupling load to the load differential pair in the foldable cascode amplifier circuit, the gain of the two-stage operational amplifier is increased through adoption of a positive feedback negative conductance gain enhancement technology; and moreover, through reasonable setting of the parameters of the mos transistors in the foldable cascode amplifier circuit, the noises of the two-stage operational amplifier can be reduced.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a two-stage operational amplifier. Background technique [0002] Operational amplifiers are an important part of many analog systems and mixed-signal systems, and high DC gain is undoubtedly an important design indicator for operational amplifiers. Since operational amplifiers are generally used to implement a feedback system, the magnitude of the open-loop DC gain determines the accuracy of the feedback system using operational amplifiers. [0003] At present, a two-stage operational amplifier based on a folded cascode structure can provide a relatively large output voltage swing while providing a relatively high gain. Specifically, the first-stage amplifier is used to achieve high gain and provide proper swing, and the second-stage amplifier is used to increase the output swing. However, although the existing two-stage operational amplifier can provide high gain, its own noise (...

Claims

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Application Information

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IPC IPC(8): H03F1/14H03F1/26H03F3/45
CPCH03F1/14H03F1/26H03F3/45417H03F2203/45096H03F1/0205H03F3/3022H03F3/45192H03F3/45636H03F2203/45644H03F1/02H03F2203/45051
Inventor 孙高明郑喆奎栗首
Owner BOE TECH GRP CO LTD
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