CN117311441B - Current mirror circuit, method and device - Google Patents
Current mirror circuit, method and device Download PDFInfo
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- CN117311441B CN117311441B CN202311608024.0A CN202311608024A CN117311441B CN 117311441 B CN117311441 B CN 117311441B CN 202311608024 A CN202311608024 A CN 202311608024A CN 117311441 B CN117311441 B CN 117311441B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is dc
- G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
- G05F3/26—Current mirrors
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Abstract
The application relates to a current mirror circuit, a method and a device. The voltage follower module clamps the output end of the mirror module to obtain the mirror current, and the output module outputs the mirror current when the mirror current meets a first preset condition, so that the mirror current is more accurate when the output voltage is low, and the influence on non-low-voltage output is smaller.
Description
Technical Field
The present disclosure relates to the field of circuit design, and in particular, to a current mirror circuit, a method and an apparatus.
Background
A low dropout linear regulator (Low Dropout Regulator, LDO) is a circuit system that performs linear real-time control by using a negative feedback mechanism, whose output current varies with load. In some applications, such as power supply circuits for photodiodes, it is desirable to monitor the change in the LDO output current in real time, for which reason it is desirable to use a load current accurate mirror circuit in order to obtain the LDO load current without affecting the LDO.
The mirror circuit in the prior art can have larger error when the output voltage is small, thereby causing inaccurate mirror current. This may lead to erroneous decisions on good products in some applications, such as supply current monitoring of photodiodes.
Disclosure of Invention
Based on this, it is necessary to provide a current mirror circuit, method and apparatus that can make the mirror current more accurate at the time of low voltage output.
A current mirror circuit comprising:
the controlled end of the mirror image module is used for being connected with the mirror image end of the mirrored circuit, and the mirror image module is used for generating mirror image current of the mirrored circuit according to the output of the mirrored circuit;
the voltage following module is connected with the output end of the mirror image module and is used for being connected with the output end of the mirrored circuit and clamping the output end of the mirror image module to obtain the mirror image current;
the output module is connected with the output end of the voltage following module and is used for outputting the mirror current when the mirror current meets a first preset condition.
In one embodiment, the mirroring module includes:
the controlled end of the mirror image tube is connected with the mirror image end of the mirror image circuit, and the output end of the mirror image tube is connected with the voltage following module.
In one embodiment, the voltage follower module comprises:
the first end of the amplifying unit is connected with the output end of the mirrored circuit, and the second end of the amplifying unit is connected with the output end of the mirroring tube and is used for carrying out equal-proportion amplification on the output voltage of the mirrored circuit so as to generate amplified voltage and clamping the output end of the mirroring module;
the first input end of the voltage following unit is connected with the output end of the mirror tube, the second input end of the voltage following unit is connected with the output end of the amplifying unit, and the output end of the voltage following unit is connected with the output module and used for following the amplifying voltage to generate a following voltage;
wherein the follower voltage is equal to the output voltage of the mirrored circuit.
In one embodiment, the output module includes:
and the switch unit is connected with the output end of the voltage following unit and is used for being in a conducting state when the following voltage meets a second preset condition so as to output the mirror current.
In one embodiment, the switching unit includes:
and the controlled end of the switching tube is connected with the ground end, and the first end of the switching tube is connected with the output end of the following unit and is used for outputting the mirror current at the second end of the switching tube when the switching tube is in a conducting state.
In one embodiment, the method further comprises:
the first feedback module is respectively connected with the second end of the amplifying unit and the output end of the mirror image module and is used for shunting the mirror image current so as to keep consistent with the second feedback module of the mirror image circuit;
the feedback circuit is used for dividing the output voltage of the mirrored circuit and transmitting a feedback signal to the mirrored circuit.
In one embodiment, the method further comprises:
and the bias module is respectively connected with the output end of the voltage following unit and the output module and is used for outputting bias current so as to enable the voltage following unit to be in a working state.
A current mirror method comprising:
generating an image current of the image circuit according to the output of the image circuit;
clamping the output end of the mirror image module to obtain the mirror image current;
and outputting the mirror current when the mirror current meets a first preset condition.
A current mirror apparatus comprising:
a mirrored circuit;
a current mirror circuit as described above.
In one embodiment, the mirrored circuit includes:
a load;
and the low-dropout linear voltage regulator circuit is connected with the load and is used for providing a voltage signal for the load so that the load works.
The current mirror circuit comprises a mirror module, a voltage following module and an output module, wherein the mirror module generates mirror current of the mirror circuit according to output of the mirror circuit, the voltage following module clamps the output end of the mirror module to obtain the mirror current, and when the mirror current meets a first preset condition, the output module outputs the mirror current, so that the mirror current is more accurate in low-voltage output and has less influence on non-low-voltage output.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is one of the block diagrams of a current mirror circuit according to an embodiment;
FIG. 2 is a schematic diagram of a current mirror circuit according to an embodiment;
FIG. 3 is a second block diagram of a current mirror circuit according to an embodiment;
FIG. 4 is a third block diagram of a current mirror circuit according to an embodiment;
FIG. 5 is a block diagram of a current mirror circuit according to an embodiment;
FIG. 6 is a fifth block diagram of a current mirror circuit of an embodiment;
FIG. 7 is a flow chart of a current mirror method according to an embodiment.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various preset conditions, but these preset conditions are not limited by these terms. These terms are only used to distinguish a first preset condition from another preset condition. For example, a first preset condition may be referred to as a second preset condition, and similarly, a second preset condition may be referred to as a first preset condition resistance, without departing from the scope of the present application. Both the first preset condition and the second preset condition are preset conditions, but they are not the same preset condition.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
It is understood that "at least one" means one or more and "a plurality" means two or more. "at least part of an element" means part or all of the element.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
Fig. 1 is one of the block diagrams of a current mirror circuit according to an embodiment, referring to fig. 1, the current mirror circuit of the embodiment includes: mirror module 100, voltage follower module 200, output module 300.
The mirror module 100, the controlled end of the mirror module 100 is used for connecting with the mirror end of the mirrored circuit, the mirror module 100 is used for generating the mirror current of the mirrored circuit according to the output of the mirrored circuit; the voltage following module 200 is connected with the output end of the mirror image module 100, is used for being connected with the output end of the mirrored circuit, and is used for clamping the output end of the mirror image module 100 to obtain mirror image current; the output module 300 is connected to the output end of the voltage follower module 200, and is configured to output the mirror current when the mirror current meets a first preset condition.
The voltage follower module 200 is usually a voltage follower formed by an operational amplifier or a transistor, and the gain of the voltage follower is approximately 1, that is, the amplification factor is approximately 1, the output waveform is hardly lost, the input impedance of the voltage follower formed by the operational amplifier is large, the output impedance is small, the effect of impedance matching can be achieved, the influence on a signal source can be reduced, the capacity of carrying load can be improved, the voltage follower can play a role of buffering a circuit, and the signal distortion caused by the overlarge output impedance of the previous stage is prevented.
Alternatively, the first preset condition may be a range of mirrored current output voltages, such as a low level or a high level voltage, where the range of voltages may ensure that the voltage follower module 200 and the output module 300 operate normally.
The first end of the voltage following module 200 is connected with the output end of the mirror module 100, and the second end is connected with the output end of the mirrored circuit, so as to clamp the output end of the mirror module 100 and limit the voltage of the output end of the mirror module 100, thereby enabling the mirror current to be more accurate; the first end of the output module 300 is connected to the output end of the voltage follower module 200, so that the voltage follower module 200 follows the voltage of the output point of the mirrored circuit to generate a follower voltage, thereby turning on the output module 300, so that the mirrored current flows through the voltage follower module 200 and is finally outputted by the output module 300.
Therefore, in the current mirror circuit provided in this embodiment, the mirror current of the mirrored circuit is generated by the mirror module 100 according to the output of the mirrored circuit, the voltage follower module 200 clamps the output end of the mirror module 100 to obtain the mirror current, and the output module 300 outputs the mirror current when the mirror current meets the first preset condition, so that when the output of the low voltage is achieved, the output of the mirror current is more accurate, and the influence on the non-low voltage output is smaller.
In one embodiment, the mirroring module includes: mirror image tube.
The controlled end of the mirror tube is connected with the mirror end of the mirror circuit to be mirrored, and the output end of the mirror tube is connected with the voltage following module 200.
The mirror tube is a MOS tube, optionally, a source electrode of the mirror tube is connected to a power supply, a gate electrode of the mirror tube may be connected to a mirror end of the mirrored circuit, so that the mirror tube generates the mirrored circuit according to an output of the mirrored circuit, and a drain electrode of the mirror tube may be connected to a first input end of the voltage follower module 200, so that the voltage follower module 200 clamps an output end (source electrode) of the mirror tube, and limits an output end voltage to obtain a more accurate mirror current output.
Fig. 2 is a second block diagram of a current mirror circuit according to an embodiment, and referring to fig. 2, a voltage follower module 200 of the present embodiment includes: an amplifying unit 210, a voltage following unit 220.
The amplifying unit 210, a first end of the amplifying unit 210 is connected with an output end of the mirrored circuit, a second end of the amplifying unit 210 is connected with an output end of the mirroring module 100, and is used for carrying out equal-proportion amplification on the output voltage of the mirrored circuit so as to generate an amplified voltage, and is also used for clamping the output end of the mirroring module 100; the voltage follower unit 220, the first input terminal of the voltage follower unit 220 is connected with the output terminal of the mirror module 100, the second input terminal of the voltage follower unit 220 is connected with the output terminal of the amplifying unit 210, and the output terminal of the voltage follower unit 220 is connected with the output module 300 for following the amplified voltage to generate a following voltage, wherein the following voltage is equal to the output voltage of the mirrored circuit.
The amplifying unit 210 may be an operational amplifier, the voltage follower unit 220 may be a MOS transistor, and the voltage follower module 200 formed by the amplifying unit 210 and the voltage follower unit 220 may be formed by connecting an operational amplifier and a MOS transistor, for example, and may follow the output voltage of the mirrored circuit and clamp the output terminal of the mirrored module.
In one embodiment, the voltage follower module comprises: an amplifying unit A1 and a voltage following unit M3.
The amplifying unit A1 is an operational amplifier, the voltage following unit M3 is a MOS transistor, the positive input end of the amplifying unit A1 is connected to the output end of the mirrored circuit, the negative input end is connected to the drain electrode of the mirrored tube M2 to clamp the drain electrode of the mirrored tube M2, the output end of the amplifying unit A1 is connected to the gate electrode of the voltage following unit M3, the source electrode of the voltage following unit M3 is connected to the drain electrode of the mirrored tube M2, and the drain electrode of the voltage following unit M3 is connected to the output module 300, so that the output voltage of the mirrored circuit amplified in equal proportion is output through the voltage following unit M3 to generate a following voltage, and is output to the output module 300 through the voltage following unit M3.
Fig. 3 is a third block diagram of a current mirror circuit according to an embodiment, and referring to fig. 3, an output module of the present embodiment includes: and a switching unit 310.
The switching unit 310 is connected to the output terminal of the voltage follower unit 220, and is configured to be in a conducting state when the follower voltage meets a second preset condition, so as to output a mirror current.
The second preset condition is that the following voltage received by the first end of the switch unit 310 is sufficient to make the switch unit 310 in a conducting state, the first end of the switch unit 310 is connected to the output end of the voltage following unit 220, the second end of the switch unit 310 is connected to the ground, and when the following voltage meets the second preset condition, the switch unit is turned on, and the mirror current is output from the output end through the switch unit 310.
In one embodiment, the switching unit 310 includes: and a switching tube.
The controlled end of the switching tube is connected to the ground, and the first end of the switching tube is connected to the output end of the voltage follower unit 220, so as to output the mirror current at the second end of the switching tube when in the on state.
Optionally, the switching tube may be a MOS tube, for example, a PMOS tube, where a gate of the switching tube is connected to a ground terminal, a source of the switching tube is connected to a drain of the voltage follower unit, and according to a conduction condition of the PMOS tube, when Vg < Vs- |vth|, the PMOS tube is turned on (saturated conduction or linear conduction), vth is a threshold voltage of the PMOS, and a gate of the switching tube is grounded, so vg=0, and when a source voltage of the switching tube is greater than an absolute value of the threshold voltage, the switching tube is in a conducting state, and a mirror current is output from the drain through a body diode of the switching tube.
FIG. 4 is a block diagram of a current mirror circuit according to an embodiment, and referring to FIG. 4, the current mirror circuit further includes: a first feedback module 400.
The first feedback module 400 is connected to the second end of the amplifying unit 210 and the output end of the mirror module 100, and is used for splitting the mirror current to keep consistent with the feedback circuit of the mirrored circuit; the feedback circuit of the mirrored circuit is used for dividing the output voltage of the mirrored circuit and transmitting the feedback signal to the mirrored circuit.
The first end of the first feedback module 400 is connected to the second end of the amplifying unit and the output end of the mirroring module 100, and the second end of the first feedback module 400 is connected to the low end, alternatively, the first feedback module 400 may be formed by, for example, two resistors connected in series, where the first feedback module 400 shunts the mirroring current, the feedback circuit of the mirroring circuit divides the output voltage thereof, and feeds the divided voltage back to the mirroring circuit, and the first feedback module 400 connected in the mirroring circuit is used to keep consistent with the feedback circuit in the mirroring circuit.
FIG. 5 is a fifth block diagram of the current mirror circuit of an embodiment, referring to FIG. 5, the current mirror circuit further comprises: the module 500 is biased.
The bias module 500 is respectively connected to the output terminal of the voltage follower unit 220 and the output module 300, and is configured to output a bias current to enable the voltage follower unit 220 to be in an operating state.
The first end of the bias module 500 is connected to the output end of the voltage follower unit 220 and the output module 300, and the second end of the bias module 500 is grounded, alternatively, the bias module 500 may be any circuit module capable of outputting a bias current that makes the voltage follower unit in an operating state, which is not limited herein, and when the mirror current is output at a low voltage, the bias current makes the voltage follower unit 220 in a saturated operating region.
Optionally, the bias module 500 is simultaneously provided for the current mirror circuit and the mirrored circuit, so that the bias currents can cancel each other out while the voltage follower unit 220 is in the saturation region, thereby not affecting the accuracy of the current mirror.
Optionally, the bias module 500 in the mirrored circuit also enables the mirrored circuit to function properly, and the bias module 500 provided in the current mirror circuit matches it.
In one embodiment, optionally, as shown in fig. 6, the current mirror circuit includes the various modules described above.
The mirror tube is M4, the grid electrode of the mirror tube M4 is connected with the output of the mirror circuit, the source electrode of the mirror tube M4 is connected with a power supply, the drain electrode is respectively connected with the negative electrode input end of the amplifying unit A1 and the source electrode of the voltage following unit M3, the positive electrode input end of the amplifying unit A1 is connected with the output of the mirror circuit, the output end of the amplifying unit A1 is connected with the grid electrode of the voltage following unit M3, the drain electrode of the voltage following unit M3 is connected with the source electrode of the switch tube M4, the grid electrode of the switch tube M4 is grounded, the drain electrode outputs mirror current when the switch tube M4 is conducted, the first end of the feedback network is connected with the negative electrode input end of the amplifying unit A1, the first end of the bias circuit is connected with the drain electrode of the voltage following unit M3, and the second end of the feedback network is grounded with the second end of the bias circuit.
When the output voltage is at a low level, if the switching tube M4 outputs no mirror current, the switching tube M4 is in a cut-off region, the mirror current flows into the bias circuit through the mirror tube M2 and the voltage following unit M3, and the source electrode of the switching tube M4 is not influenced by the output voltage of the mirror current; when small current is output, the switching tube M4 is in a weak conduction state; when a large current is output, M4 is in a saturation region, the mirror current is from the current flowing through the mirror tube M2 and the voltage following unit M3, and the magnitude of the mirror current is as follows:wherein, the method comprises the steps of, wherein,I D in the form of a MOS current,μ p in order for the carrier mobility to be such that,Wis made to be as wide as the MOS,Lis a Metal Oxide Semiconductor (MOS) long,V GS is the gate-source voltage of the MOS,V th is the threshold voltage of the MOS,λis a modulation factor for the channel length,V DS the width-to-length ratio of the switch tube M4 needs to be large enough to avoid that when the mirror current is too large, the source voltage of the switch tube M4 is too high to influence the working state of the voltage follower unit M3, and at this time, the bias circuit and the mirrored circuit have smaller side difference and have smaller influence on current matching.
When the output voltage is high level, if the switching tube M4 outputs no mirror current, the M4 is in a cut-off area, and the M4 source is not influenced by the output voltage of the mirror current; when small current is output, M4 is in a weak conduction state; when a large current is output, M4 is in a linear region, the mirror current is from the current flowing through the mirror tube M2 and the voltage following unit M3, and the magnitude of the mirror current is as follows:wherein the width-to-length ratio of the switching tube M4 needs to be large enough to make the equivalent resistor V of the switching tube M4 conductive DS /I D The output voltage is lower than the difference between the source voltage of the voltage follower unit M3 and its overdrive voltage, so that accurate matching of the current is achieved.
Fig. 7 is a flowchart of a current mirroring method according to an embodiment, and referring to fig. 7, the current mirroring method includes steps 702 to 706.
In step 702, the mirroring module generates a mirrored current of the mirrored circuit according to the output of the mirrored circuit.
In step 704, the voltage follower module clamps the output terminal of the mirror module to obtain the mirror current.
Step 706, outputting the mirror current when the mirror current meets the first preset condition.
According to the current mirroring method provided by the embodiment, the mirroring module generates the mirroring current of the mirrored circuit according to the output of the mirrored circuit, the voltage following module clamps the output end of the mirroring module to obtain the mirroring current, and when the mirroring current meets the first preset condition, the mirroring current is output, so that when the mirroring current is output at a low voltage, the mirroring current is output more accurately, and the influence on non-low voltage output is smaller.
It should be understood that, although the steps in the flowcharts of the above embodiments are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts of the above embodiments may include a plurality of sub-steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of execution of the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with at least a part of other steps or sub-steps of other steps.
The present application may also provide a current mirror apparatus including: a mirrored circuit;
and the current mirror circuit of the above embodiment. The current mirror device of the embodiment can mirror current, and is more accurate in mirror current output during low-voltage output and less in influence on mirror current during non-low-voltage output.
In one embodiment, optionally, please continue with fig. 6, the mirrored circuit includes: a load (not shown); and the low-dropout linear voltage regulator circuit is connected with the load and is used for providing a voltage signal for the load so as to enable the load to work.
The LDO is a circuit system for performing linear real-time control by using a negative feedback mechanism, and the output current of the LDO changes along with the change of a load, and is respectively composed of a reference circuit, an error amplifier, a power stage and an auxiliary circuit, so that the output voltage is stabilized under different output current conditions.
In one embodiment, the current output by the LDO is mirrored in the range of 0-2mA, and the current mirror circuit has better mirror effect along with the increase of the output current.
The current mirror circuit, the method and the device provided by the embodiment are applied to any scene in which the output current of the mirror circuit needs to be detected, can enable the mirror current to be more accurate during low-voltage output, have small influence on non-low-voltage output, and have important economic value and popularization and practice value.
In the description of the present specification, reference to the term "some embodiments," "other embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (8)
1. A current mirror circuit, comprising:
the controlled end of the mirror image module is used for being connected with the mirror image end of the mirrored circuit, and the mirror image module is used for generating mirror image current of the mirrored circuit according to the output of the mirrored circuit;
the voltage following module is connected with the output end of the mirror image module and is used for being connected with the output end of the mirrored circuit and clamping the output end of the mirror image module to obtain the mirror image current;
the output module is connected with the output end of the voltage following module and is used for outputting the mirror current when the mirror current meets a first preset condition; the first preset condition is that the output voltage corresponding to the mirror current is within a certain range, so that the voltage following module and the output module work normally; the output module comprises a switching tube, a controlled end of the switching tube is connected with the ground, a first end of the switching tube is connected with the output end of the voltage following module, and the switching tube is used for outputting the mirror current at a second end of the switching tube when the switching tube is in a conducting state; the width-to-length ratio of the switching tube is large enough to avoid that the source voltage of the switching tube influences the working state of the voltage following module.
2. The current mirror circuit of claim 1, wherein the mirror module comprises:
the controlled end of the mirror image tube is connected with the mirror image end of the mirror image circuit, and the output end of the mirror image tube is connected with the voltage following module.
3. The current mirror circuit of claim 2, wherein the voltage follower module comprises:
the first end of the amplifying unit is connected with the output end of the mirrored circuit, and the second end of the amplifying unit is connected with the output end of the mirroring tube and is used for carrying out equal-proportion amplification on the output voltage of the mirrored circuit so as to generate amplified voltage and clamping the output end of the mirroring module;
the first input end of the voltage following unit is connected with the output end of the mirror tube, the second input end of the voltage following unit is connected with the output end of the amplifying unit, and the output end of the voltage following unit is connected with the output module and used for following the amplifying voltage to generate a following voltage;
wherein the follower voltage is equal to the output voltage of the mirrored circuit.
4. The current mirror circuit of claim 3, further comprising:
the first feedback module is respectively connected with the second end of the amplifying unit and the output end of the mirror image module and is used for shunting the mirror image current so as to keep consistent with the feedback circuit of the mirror image circuit;
the feedback circuit is used for dividing the output voltage of the mirrored circuit and transmitting a feedback signal to the mirrored circuit.
5. The current mirror circuit of claim 3, further comprising:
and the bias module is respectively connected with the output end of the voltage following unit and the output module and is used for outputting bias current so as to enable the voltage following unit to be in a working state.
6. A method of current mirroring comprising:
the mirror module generates mirror current of the mirrored circuit according to the output of the mirrored circuit;
the voltage following module clamps the output end of the mirror image module to obtain the mirror image current;
when the mirror current meets a first preset condition, an output module outputs the mirror current; the first preset condition is that the output voltage corresponding to the mirror current is within a certain range, so that the voltage following module and the output module work normally; the output module comprises a switching tube, a controlled end of the switching tube is connected with the ground, a first end of the switching tube is connected with the output end of the voltage following module, and the switching tube is used for outputting the mirror current at a second end of the switching tube when the switching tube is in a conducting state; the width-to-length ratio of the switching tube is large enough to avoid that the source voltage of the switching tube influences the working state of the voltage following module.
7. A current mirror apparatus, comprising:
a mirrored circuit;
the current mirror circuit of any of claims 1-5.
8. The current mirror apparatus according to claim 7, wherein the mirrored circuit comprises:
a load;
and the low-dropout linear voltage regulator circuit is connected with the load and is used for providing a voltage signal for the load so that the load works.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311608024.0A CN117311441B (en) | 2023-11-29 | 2023-11-29 | Current mirror circuit, method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311608024.0A CN117311441B (en) | 2023-11-29 | 2023-11-29 | Current mirror circuit, method and device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117311441A CN117311441A (en) | 2023-12-29 |
| CN117311441B true CN117311441B (en) | 2024-02-27 |
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| CN202311608024.0A Active CN117311441B (en) | 2023-11-29 | 2023-11-29 | Current mirror circuit, method and device |
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| CN101498950A (en) * | 2008-12-25 | 2009-08-05 | 四川登巅微电子有限公司 | Current mirror circuit with feedback regulation and method thereof |
| CN109361201A (en) * | 2018-12-07 | 2019-02-19 | 福建超瑞创原信息技术有限公司 | A kind of LDO current-limiting circuit compared based on electric current and electronic equipment |
| CN113672025A (en) * | 2021-08-12 | 2021-11-19 | 深圳市中科蓝讯科技股份有限公司 | Power supply circuit, chip and earphone |
| CN115826665A (en) * | 2023-02-24 | 2023-03-21 | 唯捷创芯(天津)电子技术股份有限公司 | LDO circuit with current-limiting function, chip and electronic equipment |
| CN116087607A (en) * | 2022-12-09 | 2023-05-09 | 海光信息技术股份有限公司 | Current detection device and method thereof, low-dropout linear voltage regulator and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6586987B2 (en) * | 2001-06-14 | 2003-07-01 | Maxim Integrated Products, Inc. | Circuit with source follower output stage and adaptive current mirror bias |
| US8928296B2 (en) * | 2011-03-01 | 2015-01-06 | Analog Devices, Inc. | High power supply rejection ratio (PSRR) and low dropout regulator |
| US11385667B2 (en) * | 2018-12-21 | 2022-07-12 | Qualcomm Incorporated | Low dropout regulator with non-linear biasing and current clamping circuit |
| US20200293075A1 (en) * | 2019-03-15 | 2020-09-17 | Avx Antenna, Inc. D/B/A Ethertronics, Inc. | Voltage Regulator Circuit For Following A Voltage Source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101498950A (en) * | 2008-12-25 | 2009-08-05 | 四川登巅微电子有限公司 | Current mirror circuit with feedback regulation and method thereof |
| CN109361201A (en) * | 2018-12-07 | 2019-02-19 | 福建超瑞创原信息技术有限公司 | A kind of LDO current-limiting circuit compared based on electric current and electronic equipment |
| CN113672025A (en) * | 2021-08-12 | 2021-11-19 | 深圳市中科蓝讯科技股份有限公司 | Power supply circuit, chip and earphone |
| CN116087607A (en) * | 2022-12-09 | 2023-05-09 | 海光信息技术股份有限公司 | Current detection device and method thereof, low-dropout linear voltage regulator and electronic equipment |
| CN115826665A (en) * | 2023-02-24 | 2023-03-21 | 唯捷创芯(天津)电子技术股份有限公司 | LDO circuit with current-limiting function, chip and electronic equipment |
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| CN117311441A (en) | 2023-12-29 |
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