High-gain operational amplifier using feedforward compensation

An operational amplifier and feed-forward compensation technology, which is applied to DC-coupled DC amplifiers, differential amplifiers, improved amplifiers to expand bandwidth, etc., can solve the problem of power supply rejection ratio reduction, increased chip area and power consumption, and difficult zero-pole offset, etc. Problems, to achieve high power supply rejection ratio, chip area reduction, and increase the effect of gain
CN109672418APending Publication Date: 2019-04-23佛山臻智微芯科技有限公司
6 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
佛山臻智微芯科技有限公司
Publication Date
2019-04-23

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a high-gain operational amplifier using feedforward compensation, comprising a differential first gain stage, a gain bootstrap type folded cascode second gain stage and a differential pair type feedforward compensation circuit; wherein the differential first gain stage and the gain bootstrap type folded cascode second gain stage are connected in series, and meanwhile the differential pair type feedforward compensation circuit is connected with the first and second gain stages in parallel. The feedforward compensation circuit adopts a differential pair type compensationcircuit, which is simple in structure, is easy to implement, and replaces the traditional compensation capacitor form, so that the chip area can be reduced, the feedforward compensation circuit is easy to be integrated, on the other hand, the feedforward compensation circuit replaces the traditional pole separation miller compensation technology to ensure circuit stability and to greatly increasethe bandwidth of the system at the same time; and the second gain stage adopts an error amplifier of a gain bootstrap type folded cascode structure, which can have a better power supply rejection ratio than the traditional differential circuit while meeting high gain, and a main pole is from a secondary pole due to the increase of the output resistance, so that the circuit is more stable.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a high-gain operational amplifier using feed-forward compensation. Background technique

[0002] With the development of integrated circuit technology, the continuous improvement of integration, and the widespread use of digital-analog hybrid systems in the field of electronic information systems, the industry has put forward higher requirements for the design of analog integrated circuits: high performance, high integration, low power consumption etc. As an indispensable module unit in the analog and digital-analog hybrid system, the performance of the operational amplifier is directly related to the performance of the whole system. Therefore, the research and design of high-performance operational amplifiers are of great significance. On the one hand, the commonly used two-stage op amp contains many poles, which can easily lead to phase shift, that is, before the magnitude of the amplitude-frequency curve of the circuit dro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More