Fully differential rail-to-rail operational amplifier

An operational amplifier, fully differential technology, applied in the direction of differential amplifiers, amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as affecting and reducing the dynamic range of operational amplifiers

Active Publication Date: 2015-05-27
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reduction of the power supply voltage directly reduces the dynamic range of the operational amplifier, which affects its application. How to improve the common-mode range of the operational amplifier has become a research hotspot.

Method used

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  • Fully differential rail-to-rail operational amplifier
  • Fully differential rail-to-rail operational amplifier
  • Fully differential rail-to-rail operational amplifier

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Embodiment Construction

[0084] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0085] Such as figure 1 As shown, it is a circuit structure diagram of a fully differential rail-to-rail operational amplifier provided by an embodiment of the present invention. The fully differential rail-to-rail operational amplifier includes: an input stage circuit 11, a first stage amplifier circuit 12 and a second stage amplifier circuit 13 , wherein the input stage circuit 11 includes: a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4, a fifth transistor M5, a sixth transistor M6, a seventh transistor M7, an eighth transistor M8, a Nine transistors M9, tenth transistors M10, eleventh transistors M11 and twelfth transistors M12, wherein the first transistor M1, the fourth transistor M4, the fifth tran...

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PUM

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Abstract

The invention provides a fully differential rail-to-rail operational amplifier which comprises an input-stage circuit, a first-stage amplification circuit and a second-stage amplification circuit, wherein the input-stage circuit is used for transmitting an input signal to the first-stage amplification circuit; the common mode voltage of the input signal is greater than or equal to zero and is smaller than or equal to a power supply voltage value; the first-stage amplification circuit is used for amplifying the input signal transmitted from the input-stage circuit so as to obtain a first-stage amplified input signal, and used for transmitting the first-stage amplified input signal to the second-stage amplification circuit; the second-stage amplification circuit is used for amplifying the first-stage amplified input signal transmitted from the first-stage amplification circuit so as to obtain a second-stage amplified input signal, and used for outputting the second-stage amplified input signal. Under the condition that the input signal common mode voltage meets the power supply voltage, the fully differential rail-to-rail operational amplifier can still work normally.

Description

technical field [0001] The invention relates to the field of analog circuit design, in particular to a fully differential rail-to-rail operational amplifier. Background technique [0002] With the development of portable electronic products, the power supply voltage of integrated circuits continues to decrease, which poses a huge challenge to analog circuit design. The reduction of the power supply voltage directly reduces the dynamic range of the operational amplifier, which affects its application. How to improve the common-mode range of the operational amplifier has become a research hotspot. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a fully differential rail-to-rail operational amplifier, which can ensure the normal operation of the fully differential rail-to-rail operational amplifier when the input signal voltage reaches the power supply voltage. [0004] In order to solve the above technical problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/45H03F1/30
CPCH03F3/45636H03F2203/45134
Inventor 朱樟明易品筠梁宇华刘帘曦李娅妮
Owner XIDIAN UNIV
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