CN220651152U - Current mirror - Google Patents
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- CN220651152U CN220651152U CN202322484192.5U CN202322484192U CN220651152U CN 220651152 U CN220651152 U CN 220651152U CN 202322484192 U CN202322484192 U CN 202322484192U CN 220651152 U CN220651152 U CN 220651152U
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- 238000000034 method Methods 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 description 13
- 238000010168 coupling process Methods 0.000 description 13
- 238000005859 coupling reaction Methods 0.000 description 13
- 230000003321 amplification Effects 0.000 description 6
- 238000003199 nucleic acid amplification method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses a current mirror which comprises a current input end, a first transistor and a second transistor, wherein the first transistor is electrically connected with the base electrode of the second transistor, and the emitter electrode of the first transistor or the emitter electrode of the second transistor is electrically connected with the current input end. The method and the device skip the influence that the BE junction voltage VBE of the triode has a negative temperature coefficient, and can BE applied to a separation element circuit.
Description
Technical Field
The utility model belongs to the field of current mirrors, and particularly relates to a current mirror.
Background
The current mirror is usually implemented by using a dual PNP transistor or a dual NPN transistor to achieve the same collector current through the voltage coupling of the base level, as shown in fig. 1, and the greatest disadvantage of this current mirror is that, since the BE junction voltage VBE of the transistor has a negative temperature coefficient of about-2.5 mV/°c, thermal coupling is required to work properly, and it is suitable for an integrated circuit, and it is not necessary to have a common terminal for the separate element transistor.
Disclosure of Invention
The present utility model is directed to a current mirror for solving the above-mentioned problems of the prior art.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
a current mirror, comprising:
the current mirror includes:
the transistor comprises a current input end, a first transistor and a second transistor, wherein the first transistor is electrically connected with the base electrode of the second transistor, and the emitter electrode of the first transistor or the emitter electrode of the second transistor is electrically connected with the current input end.
Optionally, the emitter of the first transistor is electrically connected to the current input terminal, the current flowing through the first transistor is an input current, the current flowing through the second transistor is an output current, the current flowing through the base of the first transistor is the same as the current flowing through the base of the second transistor, and the current flowing through the collector of the first transistor and the current flowing through the collector of the second transistor have a fixed ratio.
Optionally, the emitter of the second transistor is electrically connected to the current input terminal, the current flowing through the second transistor is an input current, the current flowing through the first transistor is an output current, the current flowing through the base of the first transistor is the same as the current flowing through the base of the second transistor, the current flowing through the collector of the first transistor and the current flowing through the collector of the second transistor have a fixed ratio
Optionally, the first transistor is a PNP transistor.
Optionally, the second transistor is an NPN transistor.
Optionally, the current mirror is configured as a four-port circuit.
Optionally, the current mirror is configured as a three-port circuit, and the collector of the first transistor is electrically connected to the emitter of the second transistor, or the collector of the first transistor is electrically connected to the emitter of the second transistor.
Optionally, the first transistors are set to 1, and the second transistors are set to 1.
The beneficial effects are that:
the application adopts 1 PNP triode and 1 NPN triode, is connected through the base between two triodes, realizes the current mirror through base current coupling, has skipped the BE junction voltage VBE of triode and has negative temperature coefficient's influence, applicable separation element circuit.
Drawings
FIG. 1 is a circuit diagram of a current mirror;
FIG. 2 is a circuit diagram of a current mirror provided according to an embodiment of the present application;
fig. 3 is another circuit diagram of a current mirror according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the utility model herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
In the present utility model, the terms "mounted", "arranged", "provided", "connected", "sleeved" are to be interpreted in a broad sense. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.
Example 1:
as shown in fig. 2, the present embodiment provides a circuit diagram of a current mirror, including:
the transistor comprises a current input end, a first transistor and a second transistor, wherein the first transistor is electrically connected with the base electrode of the second transistor, and the emitter electrode of the first transistor or the emitter electrode of the second transistor is electrically connected with the current input end.
The first transistor is a PNP transistor. The second transistor is an NPN transistor. The current mirror is configured as a four-port circuit. The first transistors are set to 1, and the second transistors are set to 1. The emitters of the first transistor and the second transistor are electrically connected with the current input end, the current flowing through the base electrode of the first transistor is the same as the current flowing through the base electrode of the second transistor, and the current flowing through the collector electrode of the first transistor and the current flowing through the collector electrode of the second transistor have a fixed ratio.
When beta is 1 Equal to beta 2 According to the triode current calculation formula:
the current mirror is realized by adopting 1 PNP triode and 1 NPN triode, connecting the base electrodes of the two triodes, and achieving the proportionality of collector current through the equal base-level current coupling, and when the amplification coefficients beta of the two triodes are identical, the proportionality coefficient is 1.
The current mirror can work without strict thermal coupling (the precision can be improved by adopting thermal coupling), can be used for separating element triode circuits, can be used for forming current mirrors among triodes with different powers, and can be used in integrated circuits. The current mirror can be a 4-port circuit without a common end, so that the flexibility of circuit arrangement of the current mirror is improved, and the proportional current mirror can be realized through the difference of the beta ratio of the amplification coefficients of the two triodes.
Example 2:
as shown in fig. 3, another circuit diagram of a current mirror provided in this embodiment includes:
the transistor comprises a current input end, a first transistor and a second transistor, wherein the first transistor is electrically connected with the base electrode of the second transistor, and the emitter electrode of the first transistor or the emitter electrode of the second transistor is electrically connected with the current input end. The current flowing through the base of the first transistor is the same as the current flowing through the base of the second transistor, and the current flowing through the collector of the first transistor has a fixed ratio to the current flowing through the collector of the second transistor.
The second transistor is an NPN transistor. The emitter of the second transistor is electrically connected with the current output end, the current flowing through the second transistor is input current, the current passing through the first transistor is output current, and the first transistor is PNP transistor. The second transistor is an NPN transistor. The current mirror is configured as a three-port circuit, and the collector of the first transistor is electrically connected to the emitter of the second transistor, or the collector of the first transistor is electrically connected to the emitter of the second transistor. The first transistors are set to 1, and the second transistors are set to 1.
The current mirror is realized by adopting 1 PNP triode and 1 NPN triode, connecting the base electrodes of the two triodes, and achieving the proportionality of collector current through the equal base-level current coupling, and when the amplification coefficients beta of the two triodes are identical, the proportionality coefficient is 1.
The current mirror can work without strict thermal coupling (the precision can be improved by adopting thermal coupling), can be used for separating element triode circuits, can be used for forming current mirrors among triodes with different powers, and can be used in integrated circuits. The current mirror can be free of a common terminal, the flexibility of circuit arrangement of the current mirror is improved, and the proportional current mirror can be realized through the difference of the beta ratio of the amplification coefficients of the two triodes.
Example 3:
the current mirror comprises a current input end, a first transistor and a second transistor, wherein the first transistor is electrically connected with the base electrode of the second transistor, and the emitter electrode of the first transistor or the emitter electrode of the second transistor is electrically connected with the current input end.
The first transistor is a PNP transistor. The second transistor is an NPN transistor. The current mirror is configured as a four-port circuit. The first transistors are set to 1, and the second transistors are set to 1. The emitter of the first transistor is electrically connected with the current input end, the current flowing through the first transistor is input current, the current flowing through the second transistor is output current, the current flowing through the base electrode of the first transistor is identical to the current flowing through the base electrode of the second transistor, the current flowing through the collector electrode of the first transistor and the current flowing through the collector electrode of the second transistor have a fixed ratio, the PNP type triode and the NPN type triode are adopted, the PNP type triode and the NPN type triode are connected through the base electrode, a current mirror is realized through base current coupling, the influence that the BE junction voltage VBE of the triode has a negative temperature coefficient is skipped, and the bipolar transistor is applicable to a separation element circuit. .
Example 4:
the current mirror comprises a current input end, a first transistor and a second transistor, wherein the first transistor is electrically connected with the base electrode of the second transistor, and the emitter electrode of the first transistor or the emitter electrode of the second transistor is electrically connected with the current input end.
The first transistor is a PNP transistor. The second transistor is an NPN transistor. The current mirror is configured as a four-port circuit. The first transistors are set to 1, and the second transistors are set to 1. The emitter of the second transistor is electrically connected with the current input end, the current flowing through the second transistor is input current, the current flowing through the first transistor is output current, the current flowing through the base of the first transistor is the same as the current flowing through the base of the second transistor, and the current flowing through the collector of the first transistor and the current flowing through the collector of the second transistor have a fixed ratio.
The current mirror is realized by adopting 1 PNP triode and 1 NPN triode, connecting the base electrodes of the two triodes, and achieving the proportionality of collector current through the equal base-level current coupling, and when the amplification coefficients beta of the two triodes are identical, the proportionality coefficient is 1.
The current mirror can work without strict thermal coupling (the precision can be improved by adopting thermal coupling), can be used for separating element triode circuits, can be used for forming current mirrors among triodes with different powers, and can be used in integrated circuits. The current mirror can be free of a common terminal, the flexibility of circuit arrangement of the current mirror is improved, and the proportional current mirror can be realized through the difference of the beta ratio of the amplification coefficients of the two triodes.
Finally, it should be noted that: the foregoing description is only of the preferred embodiments of the utility model and is not intended to limit the scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (8)
1. A current mirror is characterized in that,
the current mirror includes:
the transistor comprises a current input end, a first transistor and a second transistor, wherein the first transistor is electrically connected with the base electrode of the second transistor, and the emitter electrode of the first transistor or the emitter electrode of the second transistor is electrically connected with the current input end.
2. The current mirror according to claim 1, wherein,
the emitter of the first transistor is electrically connected with the current input end, the current flowing through the first transistor is input current, the current flowing through the second transistor is output current, the current flowing through the base of the first transistor is the same as the current flowing through the base of the second transistor, and the current flowing through the collector of the first transistor and the current flowing through the collector of the second transistor have a fixed ratio.
3. The current mirror according to claim 1, wherein,
the emitter of the second transistor is electrically connected with the current input end, the current flowing through the second transistor is input current, the current flowing through the first transistor is output current, the current flowing through the base of the first transistor is the same as the current flowing through the base of the second transistor, and the current flowing through the collector of the first transistor and the current flowing through the collector of the second transistor have a fixed ratio.
4. The current mirror according to claim 1, wherein,
the first transistor is a PNP transistor.
5. The current mirror according to claim 1, wherein,
the second transistor is an NPN transistor.
6. The current mirror according to claim 1, wherein,
the current mirror is configured as a four-port circuit.
7. The current mirror according to claim 1, wherein,
the current mirror is configured as a three-port circuit, and the collector of the first transistor is electrically connected to the emitter of the second transistor, or the collector of the first transistor is electrically connected to the emitter of the second transistor.
8. The current mirror according to claim 1, wherein,
the first transistors are set to 1, and the second transistors are set to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322484192.5U CN220651152U (en) | 2023-09-12 | 2023-09-12 | Current mirror |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322484192.5U CN220651152U (en) | 2023-09-12 | 2023-09-12 | Current mirror |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220651152U true CN220651152U (en) | 2024-03-22 |
Family
ID=90294302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322484192.5U Active CN220651152U (en) | 2023-09-12 | 2023-09-12 | Current mirror |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220651152U (en) |
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2023
- 2023-09-12 CN CN202322484192.5U patent/CN220651152U/en active Active
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