Split compensation two-stage operational amplifier based on inverter input structure

A technology of operational amplifier and input structure, which is applied in the field of electronics, can solve unconfirmed problems, achieve the effect of increasing slew rate, increasing gain and unity gain bandwidth, and increasing transconductance
CN103199807AInactive Publication Date: 2013-07-10UNIV OF ELECTRONICS SCI & TECH OF CHINA
2 Cites 15 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Publication Date
2013-07-10
Estimated Expiration
Not applicable Β· inactive patent

Smart Images

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

Abstract

The invention belongs to the technical field of electronics and relates to the frequency compensation technology of operational amplifiers in analog integrated circuits. The split compensation two-stage operational amplifier comprises a two-stage operational amplifier. A first-stage operational amplifier is composed of N-channel metal oxide semiconductor (NMOS) tubes (M1N, M2N, M3 and M4) and P-channel metal oxide semiconductor (PMOS) tubes (M1P, M2P and M0). A second-stage operational amplifier is composed of a PMOS tube M5P and an NMOS tube M5N. A traditional Miller capacitor is divided into a Cm1 portion and a Cm2 portion to finish frequency compensation of the operational amplifier. A first frequency compensation capacitor Cm1 is connected with the position between the output end of the first operational amplifier and the output end of the whole two-stage operational amplifier. A second frequency compensation capacitor Cm2 is connected with the position between a connection point of a source of the NMOS tube M2N and a drain of the NMOS tube M4 in the first-stage operational amplifier and the output end of the whole two-stage operational amplifier. The split compensation two-stage operational amplifier has strong robustness and higher unit grain bandwidth and output slew rate due to the fact that non-dominant poles and stray parameter are not related.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of electronic technology and relates to the frequency compensation technology of operational amplifiers in analog integrated circuits. Background technique

[0002] Increasing demand from the semiconductor and communications industries has accelerated the development of analog integrated circuits. As an important module in analog integrated circuits, operational amplifiers are widely used in bandgap references, DC-DC converters and data converters. Commonly used operational amplifiers include single-stage amplifiers, two-stage operational amplifiers, and three-stage operational amplifiers. Two-stage operational amplifiers are widely used because of their high gain and wide output swing. However, since the two-stage operational amplifier has two close low-frequency poles, frequency compensation is required to push the two close low-frequency poles apart.

[0003] The frequency compensation technique commonly used in...

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