CN101025637A - Current mode trimming device - Google Patents
Current mode trimming device Download PDFInfo
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- CN101025637A CN101025637A CN 200610008111 CN200610008111A CN101025637A CN 101025637 A CN101025637 A CN 101025637A CN 200610008111 CN200610008111 CN 200610008111 CN 200610008111 A CN200610008111 A CN 200610008111A CN 101025637 A CN101025637 A CN 101025637A
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- 238000009966 trimming Methods 0.000 title claims description 84
- 230000008859 change Effects 0.000 abstract description 6
- 238000007493 shaping process Methods 0.000 abstract 5
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 13
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 5
- 229920005591 polysilicon Polymers 0.000 description 5
- 239000002184 metal Substances 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 240000001439 Opuntia Species 0.000 description 1
- 241001494479 Pecora Species 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The invention is a current mode shaping device for shaping target current, comprising first transistor, first resistor, operational amplifier, first controlled current source and second controlled current source, where the first and second controlled current sources regulate the respective output currents according to the shaping data; it uses the shaping data to control the controlled current sources to change the target current flowing through the first transistor in a mode of increasing or decreasing current, therefore able to linearly increasing or decreasing the target current so as to achieve the shaping purpose.
Description
Technical field
The present invention relates to a kind of finishing (trimming) device, and be particularly related to a kind of trimming device of current-mode.
Background technology
Integrated circuit (Integrated Circuit, IC) during fabrication, can be because a lot of technologic reasons have caused the drift of electrical specification.And the drift of this electrical specification on design circuit, has often produced many uncertainties.So will how to reduce the factor of electric drift, except on the program of making integrated circuit, continue to ask progressive, also have a way of mending the fold after the sheep is lost, be exactly step by finishing (trimming), adjust the electrical specification of drift.
The technology of known finishing is nothing more than polysilicon fuse (Poly fuse) or laser blows (LaserCut) dual mode.In the technology of Poly fuse, can on the main circuit of integrated circuit, connect a reconditioning circuit, in this reconditioning circuit with polysilicon (Poly-Silicon) as connecting.In the time will adjusting the electrical specification of integrated circuit, as long as strengthen electric current, the polysilicon in the reconditioning circuit is burnt, change its circuit structure, the electrical specification that just can change integrated circuit obtains needed value.And the method for Lasercut also is the same, just replaces polysilicon with metal, is not to use electric current when burning metal, but uses laser, and the same electrical specification of integrated circuit that can make changes.
Please refer to 1A figure, it is the block scheme of known reconditioning circuit.The positive input terminal of operational amplifier 110 receives reference voltage VREF, and its negative input end and output terminal then are electrically connected to the drain electrode and the grid of N transistor npn npn 120 respectively.The source electrode of transistor 120 is electrically connected to system voltage VCCA.Resistance 130,141,142,143 is serially connected with between the drain electrode and ground voltage GND of N transistor npn npn 120.Resistance 141,142,143 has the resistance value of 4R Ω, 2R Ω, R Ω respectively.Weld pad 151～153 and fuse 161～163 also are serially connected with between the drain electrode and ground voltage GND of N transistor npn npn 120 mutually.Wherein, weld pad 152 and 153 also is electrically connected to the two ends of resistance 142 respectively.By weld pad 151～153, can select any one fuse in the fuse 161～163 is burnt, and then change the connection status of fuse 161～163.By the connection status of decision fuse 161～163, and the total resistance value R of decision resistance string 130,141,142,143
TotBecause target current I
Tot=VREF/R
Tot, therefore can be by the total resistance value R of finishing resistance string 130,141,142,143
Tot, and the flow through target current I of transistor 120 of finishing
Tot
Figure 1B is the total resistance value R of the known reconditioning circuit of explanation Figure 1A
TotWith target current I
TotGraph of a relation.Please be simultaneously with reference to Figure 1A and Figure 1B, wherein the transverse axis of Figure 1B is represented the total resistance value R of resistance string 130,141,142,143
Tot, the longitudinal axis then represent the to flow through target current I of transistor 120
TotBy being clear that very much among Figure 1B, the finished result of known reconditioning circuit is not linear (linear) among Figure 1A, therefore will influence the accuracy of finishing.Moreover, since repair before fuse 161～163 all be not blown (this moment resistance string total resistance value R
TotMinimum), therefore known reconditioning circuit must be by target current I
TotMaximal value begins finishing.Therefore, as target current I
TotWhen also littler than the current value of expecting, this known reconditioning circuit is then because can't be with target current I
TotStrengthen and can't be suitable for.
Summary of the invention
Purpose of the present invention just provides a kind of finishing (trimming) device of current-mode, obtaining the finished result of linearity (linear), and can heighten or turn down finished result according to need.
Based on above-mentioned and other purpose, the present invention proposes a kind of trimming device of current-mode, in order to the finishing target current.This trimming device comprises the first transistor, first resistance, operational amplifier, first controlled current source and second controlled current source.First resistance and the first transistor are serially connected with between first voltage and second voltage.Wherein, the flow through electric current of the first transistor is this target current.The first input end of operational amplifier receives reference voltage, and its second input end is electrically connected to the common node between first resistance and the first transistor, and the output terminal of operational amplifier then is electrically connected to the grid of the first transistor.First controlled current source is electrically connected between the common node and first voltage, in order to first electric current to be provided, and adjusts first electric current according to first trimming data that is received.Second controlled current source is electrically connected between the common node and second voltage, in order to second electric current to be provided, and adjusts second electric current according to second trimming data that is received.
According to the trimming device of the described current-mode of preferred embodiment of the present invention, above-mentioned first controlled current source comprises n constant current source CS1
iAnd n switch SW 1
i, CS1 wherein
iRepresent i constant current source, SW1
iRepresent i switch, i is more than or equal to 0 and less than the integer of n, n is the integer greater than 0.Constant current source CS1
iProvide 2
iThe electric current of I ampere, wherein I is a real number.Switch SW 1
iWith constant current source CS1
iBe serially connected with between first voltage and the common node.Switch SW 1
iDetermine its keying state separately according to first trimming data.
According to the trimming device of the described current-mode of preferred embodiment of the present invention, above-mentioned second controlled current source comprises n constant current source CS2
iAnd n switch SW 2
i, CS2 wherein
iRepresent i constant current source, SW2
iRepresent i switch.Constant current source CS2
iProvide 2
iThe electric current of I ampere.Switch SW 2
iWith constant current source CS2
iBe serially connected with between second voltage and the common node, in order to determine its keying state separately according to second trimming data.
The present invention changes the target current value because of the mode by increase or minimizing electric current, that is utilizes trimming data control controlled current source, therefore can increase linearly according to the control of trimming data or the minimizing target current, and then reach the purpose of finishing.
State with other purpose, feature and advantage and can become apparent on the present invention for allowing, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Figure 1A is the block scheme of known reconditioning circuit.
Figure 1B is the total resistance value R of the known reconditioning circuit of explanation Figure 1A
TotWith target current I
TotGraph of a relation.
Fig. 2 is the trimming device that a kind of current-mode is described according to the present invention's embodiment.
Fig. 3 is the sample circuit diagram that a kind of trimming device is described according to the present invention.
Fig. 4 A is another sample circuit diagram that a kind of trimming device is described according to the present invention.
Fig. 4 B is the sample circuit diagram that a kind of fuse cell is described according to the present invention.
Fig. 5 A is a special case according to key diagram 4A trimming device of the present invention.
Fig. 5 B is a special case according to key diagram 4B fuse cell of the present invention.
Fig. 6 then is according to the trimming data and the target current I that put on weld pad P3～P0 among embodiment of the invention key diagram 5A and Fig. 5 B
TotGraph of a relation.
The main element description of symbols
110,210: operational amplifier
120, NT
0～NT
N-1: the N transistor npn npn
130,141,142,143: resistance
151～153,411, P0～P3: weld pad
161～163,412: fuse
200: trimming device
220: the first transistor
230: the first resistance
240: the first controlled current sources
250: the second controlled current sources
410-0～410-n: fuse cell
414: the second resistance
413: the three resistance
415: the first not gates
416: the second not gates
AND
0～AND
N-1: with door
CS1
0～CS1
N-1, CS2
0～CS2
N-1: constant current source
OR
0～OR
N-1: or door
PT
0～PT
N-1: the P transistor npn npn
SW1
0～SW1
N-1, SW2
0～SW2
N-1: switch
Embodiment
Fig. 2 is the trimming device that a kind of current-mode is described according to the present invention's embodiment.Please refer to Fig. 2, trimming device 200 comprises operational amplifier 210, the first transistor 220, first resistance 230, first controlled current source 240 and second controlled current source 250.Transistor 220 and resistance 230 are serially connected with between first voltage and second voltage.In present embodiment, transistor 220 for example is the N transistor npn npn, and first voltage is system voltage VCCA for example, and second voltage can be ground voltage GND.The first input end of operational amplifier 210 (is positive input terminal at this) receives reference voltage VREF, and second input end of operational amplifier 210 (is negative input end at this) is electrically connected to the common node CN between resistance 230 and the transistor 220.The output terminal of operational amplifier 210 is electrically connected to the grid of transistor 220.The resistance value of supposing resistance 230 is R
230, and the electric current of the resistance 230 of flowing through is I
Osc, I then
Osc=VREF/R
230
Controlled current source 240 is electrically connected between common node CN and the system voltage VCCA, and controlled current source 250 then is electrically connected between common node CN and the ground voltage GND.Controlled current source 240 and 250 provides first electric current I according to the first trimming data S1 and the second trimming data S2 respectively
240With second electric current I
250The target current I of transistor 220 owing to flow through
Tot=I
Osc+ I
250-I
240, therefore can control controlled current source 240 and 250 by trimming data S1 and S2, and then the decision electric current I
250With I
240Size, therefore reach finishing target current I
TotPurpose.
For example, can make electric current I by trimming data S1 and S2 control controlled current source 240 and 250
250With I
240Be all 0 ampere and (or make I
250=I
240), this moment target current I
Tot=I
OscAnd as the initial value of trimming device 200.When desire with target current I
TotWhen being trimmed to smaller value, then make electric current I by trimming data S1 control controlled current source 240
240Increase.Otherwise, when desire with target current I
TotWhen being trimmed to higher value, then can make electric current I by trimming data S2 control controlled current source 250
250Increase.
Above-mentioned controlled current source 240 and 250 can be implemented it with reference to Fig. 3.Fig. 3 is the sample circuit diagram that a kind of trimming device is described according to the present invention.Operational amplifier 210, the first transistor 220, first resistance 230, first controlled current source 240 and second controlled current source 250 can be identical with Fig. 2 among Fig. 3, so repeat no more.In present embodiment, controlled current source 240 comprises n constant current source CS1
0～CS1
N-1With n switch SW 1
0～SW1
N-1, and controlled current source 250 comprises n constant current source CS2
0～CS2
N-1With n switch SW 2
0～SW2
N-1
Constant current source CS1
iProvide 2 separately
iThe electric current of I ampere, wherein i is more than or equal to 0 and less than the integer of n, n is the integer greater than 0, and I is a real number.Switch SW 1
iWith constant current source CS1
iBe serially connected with between system voltage VCCA and this common node CN.Switch SW 2
iWith constant current source CS2
iBe serially connected with between ground voltage GND and this common node CN.Switch SW 1
iWith switch SW 2
iDetermine its keying state respectively according to the first trimming data S1 and the second trimming data S2 separately.
Fig. 4 A is another sample circuit diagram that a kind of trimming device is described according to the present invention.Operational amplifier 210, the first transistor 220, first resistance 230, constant current source CS1 among Fig. 4 A
0～CS1
N-1With CS2
0～CS2
N-1And switch SW 1
0～SW1
N-1With SW2
0～SW2
N-1Can be identical with Fig. 3, so repeat no more.In present embodiment, the first trimming data S 1 and the second trimming data S2 have the n+1 position separately; That is the first trimming data S1 has trimming data position S[n] ,/S[n-1] ... ,/S[1]/S[0], and the second trimming data S2 has trimming data position S[n], S[n-1] ..., S[1], S[0].Wherein ,/S[n-1]～/S[0] be S[n-1]～S[0] oppisite phase data.
Fig. 4 B be according to the present invention illustrate a kind of fuse cell 410-0,410-1 ..., the sample circuit diagram of 410-n.Please be simultaneously with reference to Fig. 4 A and Fig. 4 B, in present embodiment, trimming data position S[n] ,/S[n-1]～/S[0] and S[n-1]～S[0] be by fuse cell 410-0,410-1 ..., 410-n provides.Fuse cell 410-0～410-n exports the first trimming data S1 and the second trimming data S2 according to the state of its internal fuse.Below, be illustrative examples only with fuse cell 410-0, all the other fuse cell 410-1～410-n can implement it with reference to fuse cell 410-0.
Fuse cell 410-0 comprises weld pad 411, second resistance 414, the 3rd resistance 413, fuse 412, first not gate 415 and second not gate 416.First end of resistance 414 is electrically connected to system voltage VCCA.First end of resistance 413 is electrically connected to second end of resistance 141, and second end of resistance 413 is electrically connected to weld pad 411.First end of fuse 412 is electrically connected to second end of resistance 413, and second end of fuse 412 is electrically connected to ground voltage GND.The input end of not gate 415 is electrically connected to second end of 414 resistance, and the output terminal of not gate 415 output trimming data position/S[0].The input end of not gate 416 is electrically connected to the output terminal of not gate 415, and the output terminal of not gate 416 output trimming data position S[0].
When fuse 412 is not blown, trimming data position S[0] be logical zero, and trimming data position/S[0] be logical one.When desire is blown fuse 412, can provide blow current by weld pad 411, change the state of fuse by fuse 412 by a large amount of blow current.Therefore, when fuse 412 forms when opening circuit, make trimming data position S[0 owing to drawing high resistance 414] transition is logical one, trimming data position/S[0] then be logical zero.
Below, only with switch SW 1
0With SW2
0Be illustrative examples, rest switch SW1
1～SW1
N-1Can reference switch SW1
0Implement it, and switch SW 2
1～SW2
N-1Can reference switch SW2
0Implement it.Switch SW 1
0Comprise P transistor npn npn PT
0And or door OR
0Transistor PT
0Source electrode be electrically connected to constant current source CS1 respectively with drain electrode
0With common node CN.Or door OR
0The first input end and second input end receive trimming data position S[n respectively] with/S[0], and or door OR
0Output terminal be electrically connected to transistor PT
0 Grid.Switch SW 2
0Comprise N transistor npn npn NT
0With with door AND
0Transistor NT
0Source electrode be electrically connected to constant current source CS2 respectively with drain electrode
0With common node CN.With door AND
0The first input end and second input end receive trimming data position S[n respectively] and S[0], and with door AND
0Output terminal be electrically connected to transistor NT
0Grid.
For clearly demonstrating the present invention more, below will be example explanation embodiments of the present invention with n=3.Fig. 5 A is a special case according to key diagram 4A trimming device of the present invention.Fig. 5 B is a special case according to key diagram 4B fuse cell of the present invention.Please be simultaneously with reference to Fig. 5 A and Fig. 5 B, wherein when when weld pad P3～P0 applies the trimming data of Different Logic value, target current I then
TotCan be trimmed to corresponding current value.Table 1 is the truth table according to embodiment of the invention key diagram 5A and Fig. 5 B.Fig. 6 then is according to the trimming data and the target current I that put on weld pad P3～P0 among embodiment of the invention key diagram 5A and Fig. 5 B
TotGraph of a relation.As seen from Figure 6, trimming data and target current I
TotBetween relation be linear.
The truth table of table 1 Fig. 5 A and Fig. 5 B
| P3 | P2 | P1 | P0 | PT 2 | PT 1 | PT 0 | NT 2 | NT 1 | NT 0 | |
| 0 | 0 | 0- | 0 | off | off | off | off | off | off | |
| 0 | 0 | 0 | 1 | off | off | on | off | off | off | I
osc- |
| 0 | 0 | 1 | 0 | off | on | off | off | off | off | I osc-2I |
| 0 | 0 | 1 | 1 | off | on | on | off | off | off | I osc-3I |
| 0 | 1 | 0 | 0 | on | off | off | off | off | off | I osc-4I |
| 0 | 1 | 0 | 1 | on | off | on | off | off | off | I osc-5I |
| 0 | 1 | 1 | 0 | on | on | off | off | off | off | I osc-6I |
| 0 | 1 | 1 | 1 | on | on | on | off | off | off | I osc-7I |
| 1 | 0 | 0 | 0 | off | off | off | off | off | off | |
| 1 | 0 | 0 | 1 | off | off | off | off | off | on | I
osc+ |
| 1 | 0 | 1 | 0 | off | off | off | off | on | off | I osc+2I |
| 1 | 0 | 1 | 1 | off | off | off | off | on | on | I osc+3I |
| 1 | 1 | 0 | 0 | off | off | off | on | off | off | I osc+4I |
| 1 | 1 | 0 | 1 | off | off | off | on | off | on | I osc+5I |
| 1 | 1 | 1 | 0 | off | off | off | on | on | off | I osc+6I |
| 1 | 1 | 1 | 1 | off | off | off | on | on | on | I osc+7I |
In sum, by the state of decision fuse cell internal fuse, or directly set trimming data, and control first controlled current source, and then reach and repair target current I with second controlled current source provides first electric current and second electric current by weld pad
TotPurpose.The present invention changes the target current value because of the mode by increase or minimizing electric current, that is utilizes trimming data control controlled current source, therefore can increase linearly according to the control of trimming data or the minimizing target current, and then reach the purpose of finishing.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any person of ordinary skill in the field; without departing from the spirit and scope of the invention; when can doing a little change and improvement, so the present invention's protection domain is as the criterion when looking the claim person of defining.
Claims (10)
1. the trimming device of a current-mode in order to the finishing target current, is characterized in that this trimming device comprises:
The first transistor, the electric current of this first transistor of wherein flowing through is this target current;
First resistance, itself and this first transistor are serially connected with between first voltage and second voltage;
Operational amplifier, its first input end receives reference voltage, and its second input end is electrically connected to the common node between this first resistance and this first transistor, and the output terminal of this operational amplifier then is electrically connected to the grid of this first transistor;
First controlled current source is electrically connected between this common node and this first voltage, in order to first electric current to be provided, and adjusts this first electric current according to first trimming data that is received; And
Second controlled current source is electrically connected between this common node and this second voltage, in order to second electric current to be provided, and adjusts this second electric current according to second trimming data that is received.
2. the trimming device of current-mode according to claim 1 it is characterized in that this first voltage is system voltage, and this second voltage is ground voltage.
3. the trimming device of current-mode according to claim 1 is characterized in that this first transistor is the N transistor npn npn, and its drain electrode is electrically connected to this first voltage and this common node respectively with source electrode.
4. the trimming device of current-mode according to claim 1 also comprises at least one fuse cell, it is characterized in that this fuse cell exports this first trimming data and this second trimming data according to the state of its internal fuse.
5. the trimming device of current-mode according to claim 4 is characterized in that this fuse cell comprises:
Second resistance, its first end is electrically connected to this first voltage;
The 3rd resistance, its first end is electrically connected to second end of this second resistance;
Fuse, its first end is electrically connected to second end of the 3rd resistance, and second end of this fuse is electrically connected to this second voltage;
First not gate, its input end are electrically connected to second end of the 3rd resistance, and the output terminal of this first not gate is exported one in this first trimming data and this second trimming data; And
Second not gate, its input end is electrically connected to the output terminal of this first not gate, and the output terminal of this second not gate is exported other one in this first trimming data and this second trimming data.
6. the trimming device of current-mode according to claim 5 is characterized in that this fuse cell also comprises weld pad, and this weld pad is electrically connected to first end of this fuse.
7. the trimming device of current-mode according to claim 1 is characterized in that this first controlled current source comprises:
N constant current source CS1
i, in order to provide 2 separately
iThe electric current of I ampere, wherein CS1
iRepresent i constant current source, i is more than or equal to 0 and less than the integer of n, n is the integer greater than 0, and I is a real number; And
N switch SW 1
i, this switch SW 1
iWith this constant current source CS1
iBe serially connected with between this first voltage and this common node, in order to determine its keying state separately according to this first trimming data, SW1 wherein
iRepresent i switch.
8. the trimming device of current-mode according to claim 7 is characterized in that this first trimming data has the 0th to the n position, and this switch SW 1
iComprise:
P transistor npn npn PT
i, its source electrode is electrically connected to this constant current source CS1 respectively with drain electrode
iWith this common node, wherein PT
iRepresent i P transistor npn npn; And
Or door OR
i, its first input end and second input end receive the n position and the i position of this first trimming data respectively, and are somebody's turn to do or door OR
iOutput terminal be electrically connected to this P transistor npn npn PT
iGrid, OR wherein
iRepresent i or door.
9. the trimming device of current-mode according to claim 1 is characterized in that this second controlled current source comprises:
N constant current source CS2
i, in order to provide 2 separately
iThe electric current of I ampere, wherein CS2
iRepresent i constant current source, i is more than or equal to 0 and less than the integer of n, n is the integer greater than 0, and I is a real number; And
N switch SW 2
i, this switch SW 2
iWith this constant current source CS2
iBe serially connected with between this second voltage and this common node, determine its keying state separately in order to foundation second trimming data, wherein SW2
iRepresent i switch.
10. the trimming device of current-mode according to claim 9 is characterized in that this second trimming data has the 0th to the n position, and this switch SW 2
iComprise:
N transistor npn npn NT
i, its source electrode is electrically connected to this constant current source CS2 respectively with drain electrode
iWith this common node, wherein NT
iRepresent i N transistor npn npn; And
With door AND
i, its first input end and second input end receive the n position and the i position of this second trimming data respectively, and are somebody's turn to do and door AND
iOutput terminal be electrically connected to this N transistor npn npn NT
iGrid, AND wherein
iRepresent i and door.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100081112A CN101025637B (en) | 2006-02-20 | 2006-02-20 | Current mode trimming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100081112A CN101025637B (en) | 2006-02-20 | 2006-02-20 | Current mode trimming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101025637A true CN101025637A (en) | 2007-08-29 |
| CN101025637B CN101025637B (en) | 2010-06-23 |
Family
ID=38743985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100081112A Expired - Fee Related CN101025637B (en) | 2006-02-20 | 2006-02-20 | Current mode trimming device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101025637B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848005A (en) * | 2008-12-31 | 2010-09-29 | 东部高科股份有限公司 | Transmitter |
| CN103235633A (en) * | 2013-05-15 | 2013-08-07 | 聚辰半导体(上海)有限公司 | Bidirectional current trimming circuit and current trimming method thereof |
| CN103547009A (en) * | 2012-07-09 | 2014-01-29 | 晶洋微电子股份有限公司 | Linear current regulator |
| US9158321B2 (en) | 2012-06-27 | 2015-10-13 | Green Solution Technology Co., Ltd. | Linear current regulator |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4967140A (en) * | 1988-09-12 | 1990-10-30 | U.S. Philips Corporation | Current-source arrangement |
| JPH11224131A (en) * | 1998-02-04 | 1999-08-17 | Seiko Instruments Inc | Voltage regulator |
| CN1477787A (en) * | 2002-08-23 | 2004-02-25 | 联发科技股份有限公司 | Correction device of electronic charge pump and its method |
-
2006
- 2006-02-20 CN CN2006100081112A patent/CN101025637B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848005A (en) * | 2008-12-31 | 2010-09-29 | 东部高科股份有限公司 | Transmitter |
| US9158321B2 (en) | 2012-06-27 | 2015-10-13 | Green Solution Technology Co., Ltd. | Linear current regulator |
| CN103547009A (en) * | 2012-07-09 | 2014-01-29 | 晶洋微电子股份有限公司 | Linear current regulator |
| CN103547009B (en) * | 2012-07-09 | 2016-09-14 | 登丰微电子股份有限公司 | linear current regulator |
| CN103235633A (en) * | 2013-05-15 | 2013-08-07 | 聚辰半导体(上海)有限公司 | Bidirectional current trimming circuit and current trimming method thereof |
| CN103235633B (en) * | 2013-05-15 | 2015-10-21 | 聚辰半导体(上海)有限公司 | A kind of bidirectional current reconditioning circuit and current scalping method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101025637B (en) | 2010-06-23 |
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