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Open-loop operational amplifier circuit

An operational amplifier circuit and main circuit technology, applied in differential amplifiers, DC-coupled DC amplifiers, improved amplifiers to reduce nonlinear distortion, etc., can solve problems affecting system performance, open-loop operational amplifier linearity, etc. The effect of flat effective transconductance, high effective number of digits, and linear output signal

Active Publication Date: 2022-07-08
上海韬润半导体有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of a traditional open-loop operational amplifier structure with a constant power supply voltage, as the input swing continues to increase, the equivalent transconductance of the tube will continue to deviate from the linear region, which will affect the linearity of the open-loop operational amplifier. overall system performance

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Embodiment Construction

[0041] Introduced below are some of the various embodiments of the present invention and are intended to provide a basic understanding of the present invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of what is claimed.

[0042] For the purposes of brevity and illustration, the principles of the invention are described herein primarily with reference to exemplary embodiments thereof. However, those skilled in the art will readily recognize that the same principles are equally applicable to and implemented in all types of open-loop op amp circuits, and that any such variations do not depart from this patent application of true spirit and scope.

[0043] Furthermore, in the following description, reference is made to the accompanying drawings, which illustrate specific exemplary embodiments. Electrical, mechanical, logical, and structural changes may be made to these embodiments without departing from the spirit and s...

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Abstract

The invention relates to an open-loop operational amplifier circuit. The open-loop operational amplifier circuit comprises a main circuit and an auxiliary circuit, and the main circuit comprises a first differential transistor comprising a first transistor and a second transistor; a first load resistor; the first end of the first transistor and the first end of the second transistor are respectively connected with a first input end and a second input end, and the second end of the first transistor and the second end of the second transistor are mutually connected; the third end of the first transistor and the third end of the second transistor are connected with the first load resistor and the second load resistor respectively and serve as the first output end and the second output end of the open-loop operational amplifier circuit respectively, and the auxiliary circuit is connected between the first input end and the second input end of the main circuit. And the equivalent transconductance between the first output end and the second output end of the open-loop operational amplifier circuit is relatively constant. According to the open-loop operational amplifier circuit, the open-loop operational amplifier circuit with high linearity can be provided.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to an open-loop operational amplifier circuit with high linearity. Background technique [0002] With the continuous development and progress of deep sub-micron process technology, low power consumption has become the design focus of current op amps while ensuring circuit performance. In the traditional open-loop op amp structure, when the power supply voltage is constant, as the input swing continues to increase, the equivalent transconductance of the tube will continue to deviate from the linear region, which will affect the linearity of the open-loop op amp. performance of the entire system. [0003] Therefore, improving the linearity of the open-loop operational amplifier circuit becomes a problem to be solved, and it is hoped to propose an open-loop operational amplifier circuit with high linearity. SUMMARY OF THE INVENTION [0004] In view of the above problems, the pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/45
CPCH03F1/3211H03F3/45179
Inventor 周立人管逸
Owner 上海韬润半导体有限公司
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