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Method for increasing operation and amplification gain through negative resistance

A negative resistance, op amp technology, used in gain control, amplification control, electrical components, etc.

Active Publication Date: 2016-02-17
WUXI BIXUN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the higher and higher gain requirements, the design needs larger device size and higher power consumption, which is obviously intolerable in current low power applications

Method used

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  • Method for increasing operation and amplification gain through negative resistance
  • Method for increasing operation and amplification gain through negative resistance
  • Method for increasing operation and amplification gain through negative resistance

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Embodiment Construction

[0035] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0036] like figure 2 Shown is the operational amplifier structure diagram of the present invention. At the output of the first stage of the op amp, add such as image 3 Negative resistance unit shown. The negative resistance unit includes a pair of NMOS transistors, and the cross-coupling constitutes positive feedback, so the output impedance is negative. Suppose the output impedance of the op amp itself is r 0 , the output impedance of the negative resistance unit is -1 / g m , then the overall output impedance of the op amp after adding the negative resistance unit is:

[0037] r = r 0 1 - g m · r 0 ...

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Abstract

The invention provides a method for increasing operation and amplification gain through negative resistance. A negative resistance unit formed by a plurality of cross coupling NMOS differential pairs is added to the output end of a first operation and amplification grade, and whether the NMOS tube source end of each differential pair is grounded or not is controlled through N-bit operation and amplification negative resistance unit control signals SW generated by an on-chip operation and amplification gain detecting and control loop. Therefore, the negative resistance value can be controlled according to specific conditions in the use process of a chip, and a target gain value can be achieved on the premise of guaranteeing operation and amplification stability. No additional power consumption is added, and great signification is achieved on low-power-consumption design.

Description

technical field [0001] The invention belongs to the field of operational amplifier design and relates to a method for increasing the gain of operational amplifiers by using negative resistance. Background technique [0002] High-gain operational amplifiers have a wide range of requirements in feedback systems. Taking high-precision pipelined analog-to-digital converters as an example, high-gain operational amplifiers in the pipeline stage are an important condition to ensure conversion accuracy. In order to increase the gain of the op amp, a two-stage op amp with gain bootstrap is a commonly used op amp structure, such as figure 1 shown. In order to meet the higher and higher gain requirements, larger device sizes and higher power consumption are required in the design, which is clearly unbearable in current low-power applications. Contents of the invention [0003] The invention provides a method for increasing the gain of the operational amplifier by utilizing the nega...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/20
Inventor 丁洋任咏林
Owner WUXI BIXUN TECH
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