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Rail to rail operational amplifier of asymmetric bias voltage structure

A technology of operational amplifiers and bias voltages, applied in the direction of DC-coupled DC amplifiers, differential amplifiers, etc., can solve the problems of dynamic range, that is, the reduction of signal-to-noise ratio, and the inability to continue working, so as to improve the dynamic range and reduce the voltage margin. Effect

Inactive Publication Date: 2012-09-26
HUNAN HUAKUANTONG ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the power supply voltage decreases, the dynamic range of the traditional operational amplifier, that is, the signal-to-noise ratio, will be greatly reduced, and it will not even continue to work.

Method used

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  • Rail to rail operational amplifier of asymmetric bias voltage structure
  • Rail to rail operational amplifier of asymmetric bias voltage structure

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] A rail-to-rail operational amplifier with an asymmetric bias voltage structure is characterized in that it includes a rail-to-rail input stage, a rail-to-rail output stage, a gain load stage, and an asymmetric bias circuit, and the rail-to-rail input stage tail current bias Both voltage and gain load stage bias voltages are biased using an asymmetric voltage structure. Including NMOS tube and PMOS tube, NMOS tube includes M5, M6, M7, M8, M9, M10, M17, M18, M19, M20, M21, M22, M25, M27, M28, M29, M31, PMOS tube includes M1, M2 , M3, M4, M11, M12, M13, M14, M15, M16, M23, M24, M26, M30, overlapping point enable inverter, capacitors C1, C2, all NMOS tubes and PMOS tubes for CMOS technology have the same process parameters.

[0028] It is also in that six NMOS transistors M5, M6, M7, M8, M9, M10 and four PMOS transistors M1, M2, M3, M4 constitute t...

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Abstract

The invention relates to a rail to rail operational amplifier of an asymmetric bias voltage structure. The rail to rail operational amplifier is characterized by comprising a rail to rail input stage, a rail to rail output stage, a gain load stage and an asymmetric bias circuit, and tail current bias voltage of the rail to rail input stage and bias voltage of the gain load stage are both biased by adopting the asymmetric bias voltage structure. Production of an ordinary rail to rail common-mode voltage overlapped region is avoided, gain in a common-mode voltage input range is basically constant, and rail to rail voltage input and rail to rail voltage output are realized.

Description

technical field [0001] This patent relates to a rail-to-rail operational amplifier with an asymmetric bias voltage structure, especially suitable for the field of analog integrated circuit design. Background technique [0002] At present, the feature size of modern integrated circuits is getting smaller and smaller, and the international semiconductor process feature size has been reduced to 28nm, and lower sizes are also being studied, so the integrated circuit voltage is getting lower and lower, low-voltage and low-power integrated circuit design It has become a research hotspot in scientific research institutions at home and abroad. [0003] The reduction of the size of modern semiconductor technology not only reduces the power consumption of integrated circuits, but also improves the integration density and working speed of integrated circuits, which is very beneficial to the development of digital integrated circuits. However, secondary effects such as short channel ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45
Inventor 胡少飞欧阳伟李平李峰王觊婧王伟征
Owner HUNAN HUAKUANTONG ELECTRONICS TECH
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