CN103592988B - To the circuit that the voltage coefficient of reference current compensates - Google Patents
To the circuit that the voltage coefficient of reference current compensates Download PDFInfo
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- CN103592988B CN103592988B CN201210288586.7A CN201210288586A CN103592988B CN 103592988 B CN103592988 B CN 103592988B CN 201210288586 A CN201210288586 A CN 201210288586A CN 103592988 B CN103592988 B CN 103592988B
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Abstract
The invention discloses a kind of circuit that the voltage coefficient of reference current is compensated, first electric current and the second electric current respectively flow through the first transistor and transistor seconds, the drain and gate of the first transistor connects and is connected with the grid of transistor seconds, the source electrode of transistor seconds is by a resistance eutral grounding, wherein, the source electrode of the first transistor is connected to the drain electrode of compensation transistor, and the source ground of compensation transistor, the grid of compensation transistor connects supply voltage.The present invention has broken the linear relationship of reference current and supply voltage, namely achieves the compensate function to voltage coefficient, improves the numerical value of reference current when voltage is minimum.Thus reduce the supply voltage that subsequent conditioning circuit normally works, expand the supply voltage scope of normal work.
Description
Technical field
The present invention relates to a kind of Analogous Integrated Electronic Circuits clock reference current circuit, particularly relate to a kind of circuit that the voltage coefficient of reference current is compensated.
Background technology
Conventional reference current generating circuit needs to provide reference current for other circuit modules, waits effect for biased.Thus reference current generating circuit needs just to start working before other circuit are started working or always in running order usually, so reference current generating circuit needs with less domain and power consumption cost for other circuit provide current source.As shown in Figure 1, electric current I 1, I2 respectively flows through transistor N1, N2, wherein electric current I 1, I2 are mirror, the drain and gate of transistor N1 connects and is connected with the grid of transistor N2, the source ground of transistor N1, the source electrode of transistor N2 is connected to one section of resistance R, the other end ground connection of resistance R; Wherein transistor N1, N2 forms mirror, and In is output current, and I1, I2 form image current relation.The electric current of the reference current generating circuit generation of such low-power consumption is often along with supply voltage has obvious linear relationship, generally increase along with the increase of supply voltage, often when minimum power supply voltage, electric current is minimum, thus uses circuit to cause significant impact in low supply voltage situation on follow-up electric current.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of circuit compensated the voltage coefficient of reference current, the linear relationship of the reference current in reference current generating circuit with supply voltage can be broken, improve the numerical value of reference current when voltage is minimum, thus reduce the supply voltage that subsequent conditioning circuit normally works, expand the supply voltage scope of normal work.
For solving the problems of the technologies described above, a kind of circuit that the voltage coefficient of reference current is compensated provided by the invention, first electric current and the second electric current respectively flow through the first transistor and transistor seconds, the drain and gate of the first transistor connects and is connected with the grid of transistor seconds, the source electrode of transistor seconds is by a resistance eutral grounding, and wherein, the source electrode of the first transistor is connected to the drain electrode of compensation transistor, the source ground of compensation transistor, the grid of compensation transistor connects supply voltage.
Further, the first described electric current and the second electric current form mirror.
Further, described the first transistor and transistor seconds form mirror.
This circuit is offset fixing resistance by a linear resistance reduced with supply voltage, equivalent resistance after making to offset reduces along with supply voltage and reduces, thus add reference current numerical value at low supply voltages, break the linear relationship of reference current and supply voltage, namely achieve the compensate function to voltage coefficient, improve the numerical value of reference current when voltage is minimum.Thus reduce the supply voltage that subsequent conditioning circuit normally works, expand the supply voltage scope of normal work.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is existing reference current circuit figure;
Fig. 2 is the circuit diagram that the voltage coefficient of the present invention to reference current compensates;
Fig. 3 is that the present invention carries out contrast effect figure before and after voltage coefficient compensation to reference current.
Embodiment
For enabling your auditor have a better understanding and awareness object of the present invention, feature and effect, below coordinate accompanying drawing describe in detail as after.
As shown in Figure 2, electric current I 1, I2 respectively flows through transistor N1, N2, and wherein electric current I 1, I2 are mirror, and the drain and gate of transistor N1 connects and is connected with the grid of transistor N2, and the source electrode of transistor N1 is connected to compensation transistor N
cdrain electrode, compensation transistor N
csource ground, compensation transistor N
cgrid meet supply voltage vpwr5; The source electrode of transistor N2 is connected to one section of resistance R, the other end ground connection of resistance R; Wherein transistor N1, N2 forms mirror, and In is output current, and I1, I2 form image current relation.Circuit of the present invention adopts compensation transistor to form a linear resistance reduced with supply voltage by one and offsets fixing resistance, equivalent resistance after making to offset reduces along with supply voltage and reduces, thus add reference current numerical value at low supply voltages, break the linear relationship of reference current and supply voltage, namely achieve the compensate function to voltage coefficient.
As shown in Figure 3, be the contrast effect figure before and after voltage coefficient compensates, wherein A curve be before voltage coefficient compensates reference current with the change curve of supply voltage, can find out reference current along with supply voltage has obvious linear relationship; Circuit of the present invention adopts transistor to form one by the voltage-controlled linear resistance of power supply, increase with supply voltage with this and the resistance of reduction is offset fixed resistance, the resistance of actual equivalent resistance is made no longer to keep constant, thus the reference current produced is no longer linear relationship with the change of supply voltage, thus achieve compensation reference current being carried out to voltage coefficient, as shown in Fig. 3 curve B.
Above by specific embodiment to invention has been detailed description, but these are not construed as limiting the invention.Without departing from the principles of the present invention, those skilled in the art also can make many distortion and improvement, and these also should be considered as protection scope of the present invention.
Claims (3)
1. the circuit that the voltage coefficient of reference current is compensated, first electric current and the second electric current respectively flow through the first transistor and transistor seconds, the drain and gate of the first transistor connects and is connected with the grid of transistor seconds, the source electrode of transistor seconds is by a resistance eutral grounding, it is characterized in that: the source electrode of the first transistor is connected to the drain electrode of compensation transistor, the source ground of compensation transistor, the grid of compensation transistor connects supply voltage;
Described compensation transistor, forming one increases and the linear resistance of reduction with supply voltage.
2. as claimed in claim 1 to the circuit that the voltage coefficient of reference current compensates, it is characterized in that: the first described electric current and the second electric current form mirror.
3. as claimed in claim 1 to the circuit that the voltage coefficient of reference current compensates, it is characterized in that: described the first transistor and transistor seconds form mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210288586.7A CN103592988B (en) | 2012-08-14 | 2012-08-14 | To the circuit that the voltage coefficient of reference current compensates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210288586.7A CN103592988B (en) | 2012-08-14 | 2012-08-14 | To the circuit that the voltage coefficient of reference current compensates |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103592988A CN103592988A (en) | 2014-02-19 |
| CN103592988B true CN103592988B (en) | 2015-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210288586.7A Active CN103592988B (en) | 2012-08-14 | 2012-08-14 | To the circuit that the voltage coefficient of reference current compensates |
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| CN (1) | CN103592988B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107305401B (en) * | 2016-04-19 | 2019-07-12 | 中国科学院微电子研究所 | Band gap reference voltage generation circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201041642Y (en) * | 2007-06-06 | 2008-03-26 | 华中科技大学 | A power supply deviation circuit with negative feedback |
| CN202306379U (en) * | 2011-11-02 | 2012-07-04 | 国民技术股份有限公司 | Current mirroring circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7301322B2 (en) * | 2004-01-23 | 2007-11-27 | Zmos Technology, Inc. | CMOS constant voltage generator |
| JP2007052569A (en) * | 2005-08-17 | 2007-03-01 | Rohm Co Ltd | Constant current circuit and invertor using the same, and oscillation circuit |
| US8217684B2 (en) * | 2010-10-12 | 2012-07-10 | Magic Technologies, Inc. | Fast and accurate current driver with zero standby current and features for boost and temperature compensation for MRAM write circuit |
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2012
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201041642Y (en) * | 2007-06-06 | 2008-03-26 | 华中科技大学 | A power supply deviation circuit with negative feedback |
| CN202306379U (en) * | 2011-11-02 | 2012-07-04 | 国民技术股份有限公司 | Current mirroring circuit |
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| CN103592988A (en) | 2014-02-19 |
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