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Partial common mode feedback fully differential operational amplifier with starting circuit

An operational amplifier and common-mode feedback technology, which is applied in the direction of differential amplifiers, DC-coupled DC amplifiers, etc., to achieve the effect of improving phase margin

Inactive Publication Date: 2012-03-28
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] If will figure 1 The traditional partially common-mode feedback fully differential op amp shown is used in applications such as figure 2 and image 3 In such occasions, the circuit will have a non-normal operating steady state

Method used

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  • Partial common mode feedback fully differential operational amplifier with starting circuit
  • Partial common mode feedback fully differential operational amplifier with starting circuit
  • Partial common mode feedback fully differential operational amplifier with starting circuit

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with a specific example.

[0017] Such as Figure 4 , the invention includes a two-stage operational amplifier main circuit, a part of the common mode feedback circuit and a start-up circuit. Among them, the first to sixth NMOS tubes NM1 - NM6 , the first to the fifth PMOS tube PM1 - PM5 , the first and second resistors R1 - R2 , the first and second capacitors C1 - C2 Constitute a two-stage operational amplifier main circuit. The seventh and eighth NMOS tubes NM7 - NM8 , the sixth to the eighth PMOS tube PM6 - PM8 , third and fourth resistors R3 - R4 , the third and fourth capacitors C3 - C4 It forms part of the common mode feedback circuit. Common mode feedback circuit output signal V fb Control the partial load of the first stage of the main circuit of the operational amplifier, including the third and fourth NMOS transistors NM3 , NM4 . Due to the partial c...

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PUM

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Abstract

The invention, belonging to the technical field of design of analogue integrated circuit, discloses a partial common mode feedback fully differential operational amplifier with starting circuit. The circuit comprises a basic two-stage operational amplifier main circuit, a partial common mode feedback circuit and a starting circuit; and the starting circuit comprises a state detection circuit, a reset circuit and a bias switch circuit. The partial common mode feedback fully differential operational amplifier with starting circuit can solve the problem that traditional partial common mode feedback fully differential operational amplifier cannot work normally in some applications. The starting circuit can detect non normal working state of the circuit, and the reset circuit makes the operational amplifier come to normal working state. The bias switch circuit in the starting circuit can avoid competition between the reset circuit and the fixed bias load tube in the partial common mode feedback circuit in the circuit starting process. The partial common mode feedback fully differential operational amplifier with starting circuit is suitable for the circuit having need of using the fully differential operational amplifier.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuit design, and in particular relates to a partially common-mode feedback fully differential operational amplifier circuit with a start-up circuit. Background technique [0002] Fully differential operational amplifiers are one of the most basic building blocks in analog integrated circuits. It is characterized by differential signal input and differential signal output, which can suppress common-mode interference signals. In the mixed signal circuit, in order to suppress the noise on the ground and the pulse interference on the power supply, etc., the fully differential operational amplifier has been widely used. [0003] figure 1 A conventional partially common-mode feedback fully differential operational amplifier is illustrated. The first to sixth NMOS tube NM1 - NM6 , the first to the fifth PMOS tube PM1 - PM5 , the first and second resistors R1 - R2 , the first and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
Inventor 胡嵩李伟男黄煜梅洪志良
Owner FUDAN UNIV
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