An Active Feedforward Circuit Constitutes a Frequency Compensated Differential Operational Amplifier

A technology of differential operation and feedforward circuit, applied in differential amplifiers, amplifiers with semiconductor devices/discharge tubes, DC-coupled DC amplifiers, etc., can solve problems such as limiting the unity gain bandwidth of differential operational amplifiers, and reduce the realization of area, increase the unity gain bandwidth, and ensure the effect of closed-loop stability and reliability

Active Publication Date: 2017-02-22
南京英锐创电子科技有限公司
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Problems solved by technology

It mainly solves the technical problem of the zero-pole separation of the multi-stage differential operational amplifier caused by the introduction of Miller capacitance in the existing Miller frequency compensation method, thereby limiting the unity gain bandwidth of the differential operational amplifier.

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  • An Active Feedforward Circuit Constitutes a Frequency Compensated Differential Operational Amplifier
  • An Active Feedforward Circuit Constitutes a Frequency Compensated Differential Operational Amplifier
  • An Active Feedforward Circuit Constitutes a Frequency Compensated Differential Operational Amplifier

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Embodiment Construction

[0022] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0023] refer to figure 1 , the first gain stage of the fully differential amplifier includes a common-source differential pair transistor, the first NMOS transistor 11 of the first gain stage, the second NMOS transistor 12 of the first gain stage, the first load PMOS transistor 15 of the first gain stage, the first gain Stage second load PMOS transistor 16, and current source NMOS transistor 13. The source of the first load PMOS transistor 15 of the first gain stage and the second load PMOS transistor 16 of the first gain stage are connected to the power supply vdd; the source of the current source NMOS transistor 13 is grounded. The gates of the first NMOS transistor 11 of the first gain stage and the second NMOS transistor 12 of the first gain stage are respectively connected to the first input node 5 of the first gain stage and the second...

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Abstract

The invention relates to a differential operational amplifier by using active feed-forward circuit for frequency compensation, and mainly solves the technical problems that the zero pole separation of a multistage differential operational amplifier is caused as the current Miller frequency compensation method introduces Miller capacitance, and further unity-gain bandwidth of the differential operational amplifier is limited. According to the technical scheme, the differential operational amplifier comprises a first gain stage, a second gain stage and an active feed-forward amplification stage, wherein each of the first gain stage and the second gain stage comprises a first input node and a second input node; the active feed-forward amplification stage is composed of a circuit A (a control node is coupled to the first input nodes, and a control path is coupled to a second output node;) and a circuit B (a control node is coupled to the second input nodes, and a control path is coupled to a first output node;). The differential operational amplifier further comprises a common-mode negative feedback circuit, wherein the common-mode negative feedback circuit is composed of a high gain stage and an active feed-forward amplification stage. The unity-gain bandwidth performance of the fully differential operational amplifier can be effectively improved, and chip implementation area is reduced.

Description

technical field [0001] The present invention relates to the field of Integrated Circuit Operational Amplifier design (Integrated Circuit Operational Amplifier), in particular to an active feed-forward circuit configuration that does not require Miller compensation capacitors, improves the unity-gain bandwidth performance of a fully differential operational amplifier, and reduces chip implementation area Frequency Compensated Differential Operational Amplifier. Background technique [0002] An operational amplifier is one of the most basic unit circuits in analog integrated circuits and digital-analog hybrid integrated circuits. The fully differential operational amplifier has become a necessary choice because of its relatively large output swing and better rejection of power supply noise and common-mode drift. But this also means an increase in circuit complexity: fully differential operational amplifiers generally need to include a common mode negative feedback (Common Mod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F3/45
CPCH03F1/342H03F1/483H03F3/45H03F3/45376H03F3/45461H03F3/45959H03F2203/45018H03F2203/45032H03F2203/45241
Inventor 李梦雄
Owner 南京英锐创电子科技有限公司
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