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Improved Op Amp

A technology of operational amplifiers and resistors, applied in the direction of amplifiers, differential amplifiers, DC-coupled DC amplifiers, etc., can solve problems such as current mirror mismatch and process deviation, and achieve the goals of reducing mismatch, improving control accuracy, and improving replication accuracy Effect

Active Publication Date: 2019-07-19
WUXI ZGMICRO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the process deviation, the output current will not be equal to the input current, that is, the mismatch of the current mirror

Method used

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Embodiment Construction

[0028] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly.

[0030] Please refer to figure 2 As shown, it is a schematic circuit diagram of an improved current mirror circuit in an embodiment of the present invention. figure 2 Th...

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Abstract

The invention provides an operational amplifier. The operational amplifier comprises a current mirror circuit, a first differential transistor, a second differential transistor, a second current source, a third current source and a third MOS transistor. The mismatch of current mirror current replication of the current mirror circuit is very small, and the current mirror replication accuracy is high, therefore, the control accuracy of the operational amplifier is improved.

Description

[0001] 【Technical field】 [0002] The invention relates to the technical field of electronic circuits, in particular to an improved operational amplifier. [0003] 【Background technique】 [0004] Current mirrors are widely used in various analog circuits, for example, to generate current bias or as a load for operational amplifiers. However, due to process deviations, the output current is not equal to the input current, which is manifested as a mismatch of the current mirror. [0005] Please refer to figure 1 As shown, it is a schematic circuit diagram of a current mirror in the prior art, which includes PMOS (positive channel Metal Oxide Semiconductor) transistors MP1 and MP2, and the input current source I1 can generate an output current Io through the current mirror. Due to process deviation, there is a mismatch between PMOS transistors MP1 and MP2 during mass production, so that the current value of the output current Io of some chips is greater than the current value of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/30H03F3/45
CPCH03F1/301H03F1/303H03F3/45197
Inventor 王钊
Owner WUXI ZGMICRO ELECTRONICS CO LTD
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