Current mirror circuit provided with calibrating circuit

A technology for calibrating circuits and current mirrors, applied in the direction of adjusting electrical variables, control/adjustment systems, instruments, etc., can solve problems such as process deviation and current mirror mismatch, achieve the effect of reducing mismatch and improving replication accuracy

Active Publication Date: 2018-03-20
NANJING ZGMICRO 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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  • Current mirror circuit provided with calibrating circuit
  • Current mirror circuit provided with calibrating circuit
  • Current mirror circuit provided with calibrating circuit

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Embodiment Construction

[0021] 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.

[0022] 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.

[0023] Please refer to figure 2 As shown, it is a schematic circuit diagram of a current mirror circuit in an embodiment of the present invention. figure 2 The current ...

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Abstract

The invention provides a current mirror circuit which comprises a first MOS tube, a second MOS tube, a first resistor, a second resistor, a first adjustable resistor, a second adjustable resistor, a switch circuit and a calibrating circuit. The calibrating circuit controls a first switch to be on first and then controls a second switch and a third switch to be off; at the moment, the calibrating circuit samples and compares the voltage at the other end of the first resistor with that of the other end of the second resistor; when the first sampling voltage is greater than the second sampling voltage, the calibrating circuit adjusts the first regulatable resistor to a first effective resistance value and controls the second switch of the switch circuit to be on and the first switch and the third switch to be off; when the first sampling voltage is lower than the second sampling voltage, the calibrating circuit adjusts the second adjustable resistor to a second effective resistance value,and controls the third switch of the switch circuit to be on and the first and second switches to be off. Compared with the prior art, mismatch of current copy of the current mirror can be reduced, and the copy precision of the current mirror can be increased.

Description

【Technical field】 [0001] The invention relates to the technical field of electronic circuits, in particular to a current mirror circuit provided with a calibration circuit. 【Background technique】 [0002] 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. [0003] 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 curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/26
CPCG05F3/262
Inventor 王钊
Owner NANJING ZGMICRO CO LTD
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